Colias thrasibulus subsp. angustomarginata Huang & Song 2022, ssp. n.
Creators: name: Huang, Hao
name: Song, Kui
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Pieridae
Colias
Colias thrasibulus
Colias thrasibulus angustomarginata

description: Colias thrasibulus angustomarginata ssp. n.
(Figs. 23, 26, 42–43, 45–46, 48 –50, 58, 67)
Type material. Holotype (Fig. 23 - P 1): ♂, CHINA: Qinghai province, Haixi Mongol and Tibetan Autonomous Prefecture, Dulan County, ca 50 km SW. of the county, 4000–4100m, 28.VII.2021, K. Song leg., deposited in SNUC. Paratypes: 15 ♂♂, 3 ♀♀ (13 ♂♂, 2 ♀♀ in CSK, 2 ♂♂, 1 ♀ in CHH), same locality as holotype, 14.VII. & 28–29.VII. 2021, K. Song leg ..
Male holotype description. Length of forewing: 23 mm. Eye smooth. Antenna dark brown above and pale greyish brown below, with club mostly blackish brown, and with shaft obscurely segmented by pale scales. Body above black, clad with long yellowish setae, below densely clad with yellow scales. Frons and palpi clad with yellow scales, mixed with pale yellow and grayish setae. Legs clad with yellow scales, mixed with yellow setae. Both wings same shaped as in other two subspecies.
Wing-pattern generally as in other two subspecies. Ciliae pale yellow on both wings both sides, mixed sparsely with pink ones.
Male genitalia as in other two subspecies, not separable from most of the other Colias species.
Description of male paratypes. Length of forewing: 23– 26mm, mostly 24– 25mm. Ground color of wings upper side pale yellow, occasionally whitish (Specimen P2). Individual variations mainly found in marginal markings on forewing upper side and postdiscal fasciae on both wings upper side.
Description of female paratypes. Length of forewing: 23- 26mm. Upper side ground color more whitish than in males.
Etymology. The specific name refers to the narrower marginal markings on forewing upper side of the new subspecies.
Diagnosis. This new subspecies can be distinguished from ssp. thrasibulus and ssp. fasciata by the following combination of characters: 1) forewing upper side marginal markings, especially the one on vein 5, constantly narrower than in other subspecies; 2) size generally much larger than in ssp. thrasibulus, slightly larger than in ssp. fasciata; 3) forewing upper side postdiscal fasciae less developed than in other subspecies, duller and narrower, often more or less interrupted by veins; 4) hindwing upper side postdiscal fasciae usually obsolete (invariably well developed in ssp. fasciata); 5) hindwing upper side discal area paler than in ssp. fasciata, not so black-dusted.
Remarks. Only two subspecies of Colias thrasibulus were considered as valid in Grieshuber et al’s (2012) revision and Grieshuber’s (2014) Guide book: ssp. thrasibulus known from Ladakh Range (Kardung La and Chonging Valley, N. or NW. of Kardung La- TL of thrasibulus), Zanskar Range (Taglang La - TL of zanskarensis; Nimaling; vicinity of Morari Lake), E. Karakorum Range (Sasser La, Shimshin Jilga - Cretschmar, [1935]), W. Tibet (Zhabu, Rebang, Ritu - Lee, 1982 & Wu, 2010; Yanhu, Gejie - Verhulst, 2001; W. of Paryang - Grieshuber, 2014) and C. Tibet (S. of Namco Lake - Hoshiai, 1996); and ssp. fasciata known only from Yushu, SE. Qinghai. C. thrasibulus zanskarensis was retained by Verhulst (2001) as good subspecies for the populations from Zanskar Range and W. Tibet, but was regarded by Grieshuber et al. (2012) as synonym of ssp. thrasibulus as “it is within the range of variation of nominotypical C. thrasibulus ”. It is difficult to sort the population from S. of Namco, C. Tibet, as it is intermediate between ssp. thrasibulus and ssp. fasciata in distribution and wing-characters. Ssp. fasciata has only slight difference from ssp. thrasibulus in the darker discal area on hindwing upper side, however, the newly collected specimens of ssp. fasciata from Yushu confirm that this slight difference is rather constant. It is possible that ssp. fasciata is only the end of a cline of nominotypical C. thrasibulus. On the other hand, the new subspecies, angustomarginata appears to produce a entirely different phenotype with large size and obsolete black markings and suffusion on the wings upper side.
The zoogeographical pattern of Colias thrasibulus recalls that of Hipparchia autonoe (Esper, 1783) (Nymphalidae: Satyrini) in Tibetan plateau: H. autonoe changes a little from W. Tibet (ssp. mabcha Markhasiov, 2021) to Yushu, SE. Qinghai (ssp. songkui Lang, 2019), but turns to be much brighter at Dulan-Balong areas, C. Qinghai (ssp. arcellae Sbordoni, Bozano & Cesaroni, 2018).
description: Published as part of Huang, Hao & Song, Kui, 2022, A review of the genus Colias Fabricius, 1807 (Lepidoptera: Pieridae) from Qinghai with descriptions of a new subspecies of Colias thrasibulus Fruhstorfer, 1910, pp. 451-489 in Zootaxa 5105 (4) on pages 462-463, DOI: 10.11646/zootaxa.5105.4.1, http://zenodo.org/record/6333771