Thyropygus navychula, Pimvichai & Enghoff & Panha & Backeljau, 2016

Pimvichai, Piyatida, Enghoff, Henrik, Panha, Somsak & Backeljau, Thierry, 2016, A revision of the Thyropygus allevatus group. Part V: Nine new species of the extended opinatus subgroup, based on morphological and DNA sequence data (Diplopoda: Spirostreptida: Harpagophoridae), European Journal of Taxonomy 199, pp. 1-37 : 22-23

Thyropygus navychula sp. nov.

urn:lsid:zoobank.org:act:01AC06C9-EEF0-4211-9837-28FE2C12C68E

Figs 6 A–D, 11A

Diagnosis

A species of the opinatus subgroup. Mesal margin of anterior coxal fold (alp) with fine serrations. Similar in this respect to T. opinatus . Differs from this species by having the lateral process (alp)

slender, regularly curved and by having the mesal process (amp) broadly expanded and forming a strong longitudinal crest (lc) in posterior view.

Etymology

The species is named after the Royal Thai Navy, in recognition of their kind assistance which enabled us to pursue the necessary fieldwork at the type locality, and also after Chulalongkorn University where pink is the symbolic colour of the university, indirectly referring to the pink legs of the species; the species name is treated as a noun in apposition.

Material examined

Holotype THAILAND: ♂, Phang-Nga Province, Khuraburi District, Surin Islands , 9°24'20" N, 97°51'38" E, 7 Apr. 2012, leg. S. Panha, P. Pimvichai and members of the Animal Systematics Research Unit ( CUMZ-D00095 ).

Paratypes THAILAND: 5 ♂♂, 1 ♀, same data as holotype ( CUMZ-D00089 ); 2 ♂♂, same data as holotype ( ZMUC).

Description

Adult males with 58–62 podous rings, no apodous rings. Length 11–12 cm, width 6.2–7.2 mm. Adult female with 60 podous rings, no apodous rings. Length 14 cm, width 8.0 mm. Overall colour of living animal ( Fig. 11A ) dark brown, shiny. Legs and antennae pink; preserved specimen with head, antennae, prozona, legs, epiproct, paraprocts and hypoproct brown; metazona dark brown.

GONOPODS ( Fig. 6 A–D). Anterior coxal fold (ac; Fig. 6A ): lateral process (alp) slender, regularly curved, mesal margin with fine serrations; mesal process (amp) almost as long as alp, broadly expanded, apically sharp, straight distad, in posterior view mesal margin of amp forming strong longitudinal crest (lc). Posterior coxal fold (pc; Fig. 6B ) basally with moderately high lateral paracoxites (px), distally with two processes: mesal process (pmp) shorter than plp, curving behind plp; lateral process (plp) flattened, directed distad. Telopodite ( Fig. 6 C–D) leaving coxite between pmp and plp; femoral spine (fe) very long, curving almost exclusively in horizontal plane; tibial spine (ti) very long, curving in horizontal plane close to basal part of fe; spatulate lobe (sl) terminating in sharp spine; palette (pa) simple, gutterlike, distally with about twelve brownish blepharochaetae (bp), laterally with few sharp spines.

DNA barcode

The GenBank accession number of the barcode of one of the paratype is KU306522 (voucher code CUMZ-D00089).

Distribution ( Fig. 12 )

Known only from the type locality.

Figures

Fig. 6. Thyropygus navychula sp. nov., from Surin Islands, holotype (CUMZ-D00095), ♂, gonopods. A. Anterior view, left telopodite removed. B. Posterior view, left telopodite removed. C. Left telopodite, posterior-mesal view. D. Left telopodite, anterior-lateral view.

Fig. 11. A. Thyropygus navychula sp. nov., specimen from Surin Islands, living ♂ (paratype, CUMZ-D00089-1). B. Thyropygus forceps sp. nov., specimen from Namwang Srithammasokrach, living ♂ (paratype, CUMZ-D00073-1).

Fig. 12. Known distribution of the species of the T. opinatus subgroup.