Research Article |
Corresponding author: Mark J. Sterling ( m.sterling@nhm.ac.uk ) Academic editor: Carlos Lopez-Vaamonde
© 2023 Mark J. Sterling, David C. Lees, Dave Grundy.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Sterling MJ, Lees DC, Grundy D (2023) Xenotorodor stygioxanthus gen. nov., sp. nov. (Lepidoptera, Lecithoceridae, Torodorinae), described from an established population in Spain with discussion of taxonomic placement. Nota Lepidopterologica 46: 103-121. https://doi.org/10.3897/nl.46.101457
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The family Lecithoceridae is not well represented in the Palaearctic region, with very few taxa in Europe. Here we describe a new genus and species of lecithocerid moth, Xenotorodor stygioxanthus Sterling, Lees & Grundy, gen. nov., sp. nov. The taxon represents a subfamily new to Europe. We consider placement of the genus within Crocanthinae or Torodorinae. We place it in Torodorinae, notwithstanding the reduced gnathos in the male genitalia. DNA barcodes suggest that the taxon belongs within a distal clade of this subfamily. They are over 9.2% pairwise divergent from any hitherto cleanly sequenced Lepidoptera taxon and over 10.1% from nearest taxonomically identified neighbours in Neighbor Joining and ML trees. Characteristics of the DNA barcode and morphology of this new taxon suggest that refinement of synapomorphies for the family and two subfamilies is needed. We have nearly 100 records for this new species since 2020, all from a small area of Southern Spain, close to the Straits of Gibraltar. The life history and early stages of the species are unknown.
The family Lecithoceridae is a poorly known group of microlepidoptera which are found principally in the Oriental tropics, and the Australian and Afrotropical regions. Only 64 species (4.5% of the total number) are known from the Palaearctic region (
The taxon was discovered by Dave Grundy (DG), who found the first specimen at mercury vapour light at the research facility at the Centro Internacional de Migración de Aves (CIMA), Tarifa, Cádiz Province, Spain on 18 May 2020. Since this discovery, DG has recorded a total of 93 adult specimens from various locations within or near the research centre at CIMA and a further two adult specimens from Huerta Grande, Pelayo, Cádiz Province, also near to the coast on the Spanish side of the Straits of Gibraltar, approximately 10 kilometres from CIMA. These have all been found at mercury vapour light or LEDs.
In seeking to identify these specimens we first considered the European taxa of Lecithoceridae (comprising two Ceuthomadarinae in the genus Ceuthomadarus Mann, 1864 and eight Lecithocerinae in the genera Eurodachtha Gozmány, 1978, Lecithocera Herrich-Schäffer, 1853, and Homaloxestis Meyrick, 1910, but here not including two Oditinae (Peleopodidae): Karsholt and Razowski 1996;
On the basis of the molecular evidence set out here and comparative morphology, using a process of elimination benefitting from the comprehensive accounts of
The examined specimens for this paper were obtained live from light traps, refrigerated overnight and set on the following morning. The morphology of 16 specimens of this taxon collected by Mark Sterling (MS) and DG was examined. The illustrated material was photographed using a Canon EOS 5DSR camera and MP-E 65 mm lens equipped with a Stackshot system operated by Helicon Remote software (version 3.8.4 W); the shots were eventually stacked with Helicon Focus software (version 6.7.1), which was set up with montage controlled by Helicon using a motorised deck in about 30 to 40 steps for adults and 10 to 15 steps for genitalia and wing preparations. Genitalia dissection and mounting followed
The DNA from three male specimens obtained from Tarifa, Cádiz, Prov. Andalucia, Spain, NHMUK013698467–9 (details in Type Material) was extracted at
We first checked the global database of DNA barcodes on BOLD using the Identification Engine (https://v4.boldsystems.org/index.php/IDS_OpenIdEngine) and building the corresponding Neighbor Joining tree. This led to a more detailed molecular examination of the information content in DNA barcodes and tree building analyses using COI-5P.
We downloaded available Lecithoceridae from BOLD on 21/12/2022 for comparative analysis with the DNA barcode of the query taxon. We downloaded from GenBank the mixed COI and seven-gene nuclear datasets for Lecithoceridae of
For the Lecithoceridae DNA barcodes, 435 unique BIN (Barcode Index Number) representatives that each had the longest sequence length in the corresponding ‘tsv’ file that had been downloaded from BOLD along with their GenBank accession numbers, where available, were considered and a few obvious non-members of Lecithoceridae were eliminated. We carried out a similar process for the related families Autostichidae and Xyloryctidae. Pairwise divergences were computed in this program using the Pairwise Alignment option in Bioedit 7.2.5 (
A local BLAST was conducted in Bioedit of the (up to 658 bp) dataset constructed from these 429 sequences, to find the nearest hits, and the pairwise divergences were checked for these over comparable codons as described above.
To go further, we examined the placement of our sequences in relation to the GenBank and BOLD datasets. The idea was, when adding available DNA barcodes of Lecithoceridae, to provide a provisional scaffold for the families and subfamilies, whilst avoiding problems of paralogy by having a COI part of the dataset across all taxa, analyses that we detail here.
For the nuclear data we eliminated IDH as having only three representatives of only two subfamilies, but no Torodorinae. We analysed the resulting 5408 bp alignment (COI 1475 bp including COI-5P for 12 representatives, EF-1α 985 bp for 15, Wingless 400 bp for 16, RpS5 600 bp for 12, CAD 850 bp for nine, MDH 407 bp for 10, and GAPDH 691 bp for six representatives). For a quick tree analysis we used Phyml 3.0 (online: http://www.atgc-montpellier.fr/phyml), with the GTR + G + I model selection as implemented by the Bayesian Information Criterion (BIC), and showing ABayes support.
Phyml runs were done by building datasets of publicly available DNA barcode sequences from BOLD that had been identified or were identifiable to at least generic level, alongside the 5408 bp alignment for 17 taxa, selecting where possible the longest public domain sequence within one representative of each Barcode Index Number (BIN), along with the mixed seven-gene COI and nuclear alignment. We concentrated on being as comprehensive as possible within these constraints for Torodorinae and Crocanthinae (testing between 21 and 32 terminals), ending up with a 51-terminal dataset.
For further analyses of the 5408 bp Lecithoceridae alignment from GenBank, we used IQ-TREE (http://www.iqtree.org) on the 17-taxon portion of the dataset, with or without the two haplotypes of the DNA barcode of the query taxon, using a partitioning file specifying the start and ends of each of the seven genes and using automatic selection (Bayesian Information Criterion) to allocate the optimal model for each gene, displaying both ABayes and Bootstrap values (100 runs), with parameters edge-linked or edge-unlinked across the partition.
Finally, we carried out a gene-partitioned analysis of the entire dataset (51 taxa, 5408 characters) in MrBayes 3.1. This analysis implements the GTR model as in Phyml but allows rates to vary among partitions using a rate multiplier. We used the following parameter settings: nst=6 and rates=invgamma. In one run we specified unlinking of the parameters statefreq, revmat, shape, and pinvar, whereas in the second, they remained linked (by default). In both cases, a variable rate prior was set, the run included 10,000,000 generations under a Markov Chain Monte Carlo process, and the burnin rejected the first 25% of trees in four chains, finally verifying for convergence between two tree runs. The resulting consensus trees provide a more rigorous and direct assessment of Bayesian posterior support than is estimated using ABayes in Phyml.
Suppl. material
a. Phylogenetic analysis using ML as implemented in IQ-TREE (edge-unlinked), of Lecithoceridae using 17 taxa from GenBank for a matrix of 5408 characters and 3–8 nuclear genes (‘3g’..‘8g’), together with DNA barcodes of the holotype and a paratype of Xenotorodor stygioxanthus gen. nov., sp. nov., showing a supported position in (Crocanthinae + Torodorinae), and a branch with greater proximity to species of Thubana and Torodora than to the type species of Crocanthes, C. prasinopis. The first support value for each node is ABayes, and the second percentage of 100 bootstraps. The tree is displayed as ‘midpoint’ rooted. b. Phylogenetic analysis of Lecithoceridae in Phyml 3.0 showing the placement of the holotype DNA barcode of Xenotorodor stygioxanthus gen. nov., sp. nov. (an individual is shown in its ‘alert’ resting posture). The tree is based on a matrix of 51 taxa and 5408 characters, with all taxa represented by COI-5P. Terminal names include the last seven characters of the BOLD cluster (BIN, abbreviated from the format ‘BOLD:ABC1234’), and the country of origin, where known or relevant. ‘3g’..‘8g’ specifies the number of genes used (two sections of COI and EF-1a are treated as single genes), for requisite taxa whose nuclear data is from GenBank. ABayes support values are shown to the right of nodes; values < 0.95 are not considered supported for the purposes of this analysis. The tree is rooted on Nosphistica, and all subfamilies are delineated, where known.
Query of the DNA barcodes of the query taxon (the barcode of NHMUK013698469 is identical to that of NHMUK013698468 and differs by a C as opposed to a T in position 118 of the holotype, NHMUK013698467) on BOLD placed the taxon as more than 9.06–9.22% by p-distance from any other micromoth. However, as an exception, a single gelechiid came up as the top hit (Ephysteris diminutella (Zeller, 1847), Process ID LON7008-18, GenBank accession MN805721, which is 8.99% by p-distance). Of its 618 bp, 62 are ambiguously coded. When these are ignored, it is 9.0% pairwise divergent (Bioedit), whereas a clean (658 bp) sequence adjacent by its Process ID code for the same species, LON7007-18 (MN805536) is 13.07% divergent to the query taxon. This sequence should ideally be removed from consideration by BOLD. All the other ten top hits were unidentified Lepidoptera (probably lecithocerids) or identified as Lecithoceridae. The nearest identified lecithocerid species at 9.2–9.38% p-distance for two different specimens was identified as ‘Thubana exaema’ (i.e., Thubana exoema (Meyrick, 1911)) from Sri Lanka (see Discussion). The two haplotypes of the query taxon were 9.55–9.71% to the nearest two sequences identified only as a lecithocerid, and 9.68–9.82% to the nearest ones identified as a Torodora (BOLD:AAH3804 from Australia and BOLD:ABY1674 from Vietnam). In the corresponding NJ tree, the query taxon linked, albeit with long branches, to eight nearest terminals representing five BINs all from SE Asia, two of which were identified as Lecithoceridae and one of which as Torodora Meyrick, 1894, whereas it fell relatively remotely from T. exoema among the top 99 hits.
As another distance approach, using a local BLAST in Bioedit of the 429 Lecithoceridae sequences representing different BINs downloaded from BOLD, the sequences of the query taxon were 9.57–9.73% pairwise divergent to a species of Lecithoceridae (BOLD:ACT7825, LNAUT3910-15, Malaysia), 9.8–9.95% to another Lecithoceridae (BOLD:ADV1376, GMPBS211-18, Pakistan), 10.18–10.33% to Halolaguna sublaxata Gozmány, 1978 (BOLD:ABA2899, KF523781) and 10.1–10.35% to Torodora aenoptera Gozmány, 1978 (BOLD:AEG4946, MN852952), these representing the four top “hits” by local BLAST.
As a third approach, the top hit using nucleotide BLAST on Genbank on 29/01/2023 was Halolaguna sublaxata (KF523779.1) at 9.86–9.71% divergence (depending on the haplotype of the query taxon). However, equally divergent was a member of Xyloryctidae, Xylorycta cirrhophragma Meyrick, 1921 (KF404885.1), with H. sublaxata (KF523781.1) at 10.02%, showing weak signal to noise for this approach, which does not benefit from the DNA barcode dataset comprehensiveness of BOLD.
We then examined the amino acid translation of the DNA barcode region of the alignment, first examining the 429 BINs attributed to Lecithoceridae. The 161st complete codon has the state Asparagine (N), as opposed to Serine (S), which is more usual in Gelechioidea. This is the state in NHMUK013698467–9 and is particularly prevalent in Lecithoceridae. Among the Lecithoceridae BINs, the following states (using standard amino acid abbreviations) are represented: N = 91.8%, S = 7%, K = 0.9% and D = 0.2%. By contrast, among the 221 Autostichidae BINs the proportions of states were N = 0.9%, S = 94.6%, others = 0.45% (F, L, M, T, Y), whereas among the 810 BINs of Xyloryctidae, N = 2.5%, S = 71.7%, F = 9.5% and other states 16.3% (Y, M, A, T, Q, L, K, I). An ‘N’ (generally the triplet AAT although sometime AAC) was a feature of all the sequences identified to at least a Torodorinae genus, except that an apparent reversal (see Fig.
Based on analysis of 17 terminals including nuclear data or 19 terminals including the two haplotypes of the query taxon, IQ-TREE automatically implemented the following partitioned model selection: COI: GTR+F+I+G4; EF-1a: Tim3e + G4; Wingless: K2P + G4; RpS5: TIM2e + G4; CAD: TIM2 + F + G4; GAPDH: TIM2u + F + I; MDH: TIM2e + G4. Although the edge-unlinked partitioned analysis in IQ-TREE provided a slightly higher log likelihood than the corresponding edge-linked analysis (-23644 to -23770; 17 terminals and -23805 +/343 to -23939 +/- 346; 19 terminals) the standard errors overlapped and the lower Bayesian Information Criterion for the edge-linked analysis was therefore preferred (48548 vs 49261). In this analysis, when 17 taxa were run (i.e., only taxa with nuclear data), the Ceuthomadarinae node showed a value of pp = 1 /bootstrap = 100%, with the Lecithocerinae + Torodorinae + Crocanthinae node with 1/64%, the Crocanthinae + Tororodinae node with 1/100%, and the Torodorinae node (Thubana + Torodora) not achieving support thresholds (0.877/64%). When the two haplotypes of the query taxon were added (Fig.
We attempted various phylogenetic analyses of available sequences using Phyml 3.0, an instance of which is shown (Fig.
The Phyml analyses never placed the new taxon within the Ceuthomadarinae nor the Lecithocerinae. These groups each appear to be monophyletic according to
The Phyml 3.0 analysis only showed separation of Crocanthinae and Torodorinae in cases when taxon/BIN sampling was relatively dense (instance shown in Fig.
The MrBayes analyses on the 51-terminal 5408 bp dataset using a paratype sequence of the query taxon (NHMUK013698469, OQ339153) provided a 50 percent majority rule consensus tree (shown in Suppl. material
Xenotorodor stygioxanthus Sterling, Lees & Grundy, sp. nov.
Holotype
♂ Spain, Cádiz, Tarifa, CIMA, Site 1, MV light, 24.v.2022, 36.0167, -5.5864, 60 m, Leg. M. Sterling, D. Grundy, specimen no. NHMUK013698467, slide no. NHMUK014331156, wingspan 14 mm, fwl 6.25 mm. Paratypes (12♂, 3♀) 2♂, collection data as holotype, specimen number NHMUK013698468, specimen number NHMUK013698469; 1♀, 27.05.2022, otherwise same collection data for Site 1, specimen no. NHMUK013699868, slide no. NHMUK014331160. 3♂ Spain, Cádiz, Tarifa, CIMA, Site 2, MV light 25.v.2022, 36.0166, -5.5858, 75 m, specimen no. NHMUK013699866, slide no. NHMUK014331157, specimen no. NHMUK013699867, slide no. NHMUK014331158, specimen no. NHMUK013698979, slide no. NHMUK014331159; 1♀ 27.v.2022, otherwise same collection data for Site 2, specimen no. NHMUK013698523, slide no. NHMUK014331162. 3♂, Spain, Cádiz, Tarifa, CIMA, Site 3, MV light 27.05.2022 36.0148, -5.5871, 85 m, specimen no. NHMUK013699869, specimen no. NHMUK013699871, specimen no. NHMUK013698522; 1♀, same collection data as site 3, specimen no. NHMUK013699870. 3♂ Spain, Cádiz, Tarifa, CIMA, Site 4, MV light, 29.v.2022, specimen no. NHMUK013698524, specimen no. NHMUK013698525, specimen no. NHMUK013698526, 1♂ Site 4, 30.v.2022, specimen number NHMUK013699872. The holotype and 12 paratypes have been deposited at the
Forewings black with a purplish sheen, a narrow yellow bar from costa to dorsum before ½ and a yellow costal spot at ¾ (Figs
Xenotorodor stygioxanthus gen. nov., sp. nov. 2. ♂ Holotype. 3. ♀ Paratype. 4. ♂ Habitus. 5. Male genitalia. 6. Aedeagus. 7. Pre-genital abdomen (5–7. ♂ holotype slide no. NHMUK014331156). 8. ♂ Holotype lateral image prior to mounting, gnathos indicated. 9. Wing venation slide no. NHMUK014331163. 10. ♂ Holotype, highly magnified section of antenna. 11. ♀ Paratype, female genitalia, slide no. NHMUK014331160. Scale bars: 5 mm (black); 0.5 mm (green). Figs 4, 8 and 10 not to scale.
Male. Wingspan 13–15 mm. Head. Ocellus absent, frons dark grey, vertex dark grey with thick lateral tufts of dark grey and dark yellow scales, yellow scaling continuing above the eye; maxillary palps very small, grey, pilifers with thick brushes of short yellowish bristles. Labial palps long, thin, strongly recurved, approximately 3× diameter of eye, dark yellow, basal segment paler than other segments, second and third segment same length. Antenna same length as forewing, yellow, long scape with appressed scales, rings of thick yellow scales pointing outwards from base of each flagellomere give antenna a thickened appearance (see Fig.
Female. Similar (including labial palps). Rings of antennal scales shorter and colour of antenna paler than in male.
Male genitalia. Uncus directed caudally, narrow, elongate, slightly spatulate posteriorly, with narrow elongate lateral flanges. Gnathos fused to tegumen, small, box like, membranous, a very small sclerotised projection from tegumen medially. Tegumen broad anteriorly, tapering and indented posteriorly, weakly sclerotised, rough textured; pedunculi short, slightly curved. Vinculum semicircular, thin, strongly sclerotised, melanised. Saccus short and very broad. Juxta short and broad, almost square in shape, without caudal projections. Valva weakly sclerotised, costal margin bulging medially, sharply converging towards ventral margin postmedially, cucullus rectangular, small pointed projection at apex, cucullar region with dense broad setae, small digitate process near inner margin of setae. Aedeagus short, straight, weakly sclerotised, with a small rounded projection posteriorly, and a single broad arrow headed cornutus medially, strongly sclerotised posteriorly, hooked anteriorly.
Female genitalia. Papillae anales short and broad. Apophyses posteriores over 1.5× length of apophyses anteriores. Eighth tergite rectangular. Eighth sternite indented posteriorly. Ostium circular. Antrum short, broad, membranous. Ductus bursae short, broad and membranous, appendix bursae present. Corpus bursae rounded, without signum.
Collection of samples of leaf litter for early stages in May 2022 proved unsuccessful and the early stages are unknown. Since its discovery in 2020, the adult has been recorded in May, June, August, September and November. The principal emergences are in late May/June and August with 20 records between 18 May and 21 June 2020, 48 records between 24 May and 11 June 2022 and 22 records between 17 and 22 August 2021. Recording in May/June 2021 was not possible due to COVID restrictions. Both sexes are attracted to mercury vapour light and have been found flying around MV lights in the two hours after darkness. When the adult is resting the antennae are projected upwards and sideways (see Fig.
The taxon is known principally from various localities in an area consisting of a patchwork of Mediterranean scrub, dry cattle grazed pasture, wild olive groves and some Eucalyptus sp. plantations, approximately 0.5 kilometres from the coast around the research centre at CIMA near the town of Tarifa in Southern Spain. Two specimens (not retained) were found in June 2022 at Huerta Grande, Pelayo (36.081, -5.503, 250 m) approximately 10 kilometres from CIMA and slightly further inland. Huerta Grande has been well recorded by DG in the flight period of this species for the last 10 years and the moth has never been recorded there before, so this is believed to be a new arrival. The climate in the presently known range is wet and warm in winter (temperatures not usually below freezing) and almost completely dry in summer.
Xenotorodor from xenos, gr., meaning, among other things, stranger or outsider. This is a reference to the unusual combination of morphological features for a species of Torodorinae in the new taxon, and the substantial geographical extension of the range of the subfamily. The gender of the genus name is male. The specific name stygioxanthus is from stygios, gr., meaning among other things extremely dark; and xanthos, gr., meaning yellow, a reference to the blackish forewings marked with yellow.
Type material and six unset and unpinned specimens in tubes with the following data, which are excluded from the type material: 4♂ Spain, Cádiz, Tarifa, CIMA, MV light, 17–21.viii.2021, leg. D. Grundy; 2♂ Spain, Cádiz, Tarifa, CIMA, MV light, 05–13.xi.2021, leg. D. Grundy. The remainder of the specimens recorded were not retained although photographs of 20 of these specimens, taken by DG, were examined.
The results from the DNA barcode query and the analyses considering distance and Neighbor Joining support a diagnosis of Lecithoceridae for the new taxon. Also, from our search of the sequences for synapomorphies, we consider the state Asparagine (N) in the 161st complete codon of the DNA barcode to represent a ground plan synapomorphy of Lecithoceridae, which is reversed in a few genera and species (for example distally in the genus Sisyrodonta and in Lecithocera nigrana and its widely dispersed species complex). The new taxon exhibits this synapomorphy. This is a groundplan feature of all lineages of Lecithoceridae sensu
According to
The suggested synapomorphies of Crocanthinae, apart from the state of the gnathos, include relatively bright coloured wings and hindwing often with similar markings like those of the forewing (
In addition, the general appearance (externally and in the male and female genitalia) of the new taxon is substantially different from any species currently described within Crocanthinae, which are almost exclusively only known from the island of New Guinea and Australia, although a few genera reach other parts of Indonesia and the Philippines.
Only three existing genera of Crocanthinae are represented here (Fig.
The subfamily Torodorinae is defined (
Moving to the molecular data, in interpreting the IQ-TREE analysis on the 19-terminal dataset (Fig.
The IQ-TREE analysis (Fig.
However, as noted in
The morphological differences between Xenotorodor and Crocanthes are dealt with above. Also, the new taxon is morphologically divergent from all existing genera within Torodorinae and is genetically divergent from those eight traditional torodorine genera (plus Sisyrodonta) whose DNA barcode sequences were available for analysis. It displays some distinctive characters shared with some genera (including Sisyrodonta and Cophomantella which are not currently placed in either Torodorinae or Crocanthinae), but to place it in an existing genus would involve polyphyletic expansion of the concept of that genus. The genera with which the present taxon displays some potential synapomorphies (and the reason for rejecting placement in those genera) are:
Protolychnis Meyrick, 1925 (type species Lecithocera maculata Walsingham, 1881, from South Africa). The antenna of the type species was described by Lord Walsingham (
Sisyrodonta Meyrick, 1922 (type species Sisyrodonta ochrosidera Meyrick, 1922, from Australia). This is currently a monotypic genus known from Western Australia, although DNA barcodes indicate (e.g. Fig.
Cophomantella Fletcher, 1940 (type species Onebala elaphopis Meyrick, 1910, from India). Cophomantella was established as an objective replacement name for Cophomantis, Meyrick, 1925, a junior homonym of a frog, Cophomantis Peters, 1870 (
Torodora Meyrick, 1894 (type species Torodora characteris Meyrick, 1894, from Myanmar). This is a genus which comprises more than 200 described species (
Thubana (Type species Thubana bisignatella Walker, 1864, from Borneo). Although it is 9.2–9.38% pairwise divergent, T. exoema (Meyrick, 1911) is the nearest identified sequenced species of Lecithoceridae to the present taxon in the NJ tree resulting from the BOLD search, while the one Thubana species analysed (Figs
Halolaguna (Type species Halolaguna sublaxata Gozmany, 1978, from China). This is one of the genera which appears in a molecular clade of Torodorinae with the present taxon (along with typical Protolychnis and Sisyrodonta, Fig.
Crocanthes (Type species Crocanthes prasinopis Meyrick, 1886: 277, from Australasia) and Aprosoesta Turner, 1919 (type species A. pancala Turner, 1919). See above for discussion of Crocanthes. Aprosoesta is mentioned separately but only because of the relative proximity of the A. pancala sequences to those of the new taxon in Fig.
The origin of the population of this taxon in Southern Spain is not clear. It could be a previously undiscovered but long resident population. Although the Microlepidoptera of Spain seem reasonably well studied, there must be many species still awaiting discovery. However, this is a distinctive taxon, evidently common where it occurs, which is not likely to be overlooked and the habitat in which it occurs is not uncommon in Southern Spain so there is no obvious reason why it would not occur elsewhere. A second possibility is that it is a previously unknown species originating from North Africa which is now spreading into Southern Europe (although it is clearly distinct morphologically and genetically from Ceuthomadarus from NW Africa). A number of species have been found around Tarifa which are taking this route, most likely as a result of climate change making conditions hotter and harsher in North Africa, causing resident species to expand northwards. DG has recorded in this area since 2017 but did not see this taxon until May 2020. Considering the increasing numbers of X. stygioxanthus at the locations around CIMA and the discovery of specimens at Huerta Grande, arrival from Africa may explain the Spanish population. A third possibility is that this taxon is an invasive species that has come, possibly from Australia, as a result of plantation of Eucalyptus spp. or other imported plants in the area. However, the taxon does not seem to be closely related to any known or previously DNA barcoded Australian genus of lecithocerid moth, and the DNA barcoding campaign on ANIC collections was more extensive than for any comparable tropical region.
It is noteworthy to detect a new subfamily for the European continent that is established in Spain. This interesting taxon from around Tarifa exhibits considerable morphological and genetic divergence from hitherto known or DNA barcoded taxa (between about 10 and 13% to its nearest phylogenetic neighbours, and more than 9.2% from nearest hits as regards sequences not compromised by ambiguity codes). Its placement was not straightforward. It is clearly a lecithocerid both on the basis of its morphology and its DNA barcode, and it appears to fall by phylogenetic analysis within Torodorinae rather than Crocanthinae, despite its reduced gnathos. Our placement in a new genus is by elimination and should spur other attempts to find its closest relatives. The work we have carried out in seeking to place the taxon shows that existing data is insufficient to show that Torodorinae and Crocanthinae are separate clades, with an expanded phylogenomic dataset clearly needed, and that the morphological synapomorphies supporting Lecithoceridae, Torodorinae and Crocanthinae need further refinement. Torodorinae is a subfamily which is widespread palaeotropically and we are unable to narrow the origin of X. stygioxanthus. Further field and taxonomic studies of this taxon and other Lepidoptera in adjacent parts of North Africa and Southern Spain are likely in our view to yield interesting results in terms of taxonomic diversity, relationships of the currently established fauna, and changes in populations as a result of changing climate conditions.
The specimens examined for this study were collected in accordance with a permit issued by the Junta de Andalucia dated 11 April 2022. No specific funding was provided for this project and there are no conflicts of interest.
We would like to thank the management and staff of Fundacion Migres at the Centro Internacional de Migración de Aves (CIMA) for their warmth and hospitality and for all their help with this project and the Junta de Andalucia for issuance of the permit pursuant to which the study material was collected. Piotr Cuber (
DNA sequences
Data type: table (Excel spreadsheet)
Explanatory note: DNA sequences for terminals used in the trees (Fig.
50% majority rule consensus tree 1
Data type: figure (tif image)
Explanatory note: 50% majority rule consensus tree for a partitioned analysis of the 51 taxa, 5408 bp dataset in MrBayes 3.1. Support values are posterior probabilities based on a subset of 7,500 trees out of 15,001 sampled every 1,000 generations per separate run, by which point the runs had converged to 1.000. All parameters (except branch length) were unlinked and a variable rate prior was applied across the seven partitions and the final log likelihood for the best state of each ‘cold’ run asymptoted at - 28054 or - 28059.
50% majority rule consensus tree 2
Data type: figure (tif image)
Explanatory note: 50% majority rule consensus tree for a partitioned analysis of the 51 taxa, 5408 bp dataset in MrBayes 3.1. Support values are posterior probabilities based on a subset of 7,463 trees out of 15,000 sampled every 1,000 generations per separate run, by which point the runs had converged to 1.000. All parameters were linked (by default) and a variable rate prior was applied across the seven partitions and the final log likelihood for the best state of each ‘cold’ run asymptoted at -28634 or -28635.