Thyropygus mesocristatus, 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 : 20-21

Thyropygus mesocristatus sp. nov.

urn:lsid:zoobank.org:act:5D8F7830-2E8E-46E3-B2BE-830FC31F290D

Fig. 5 A–E

Diagnosis

A species of the opinatus subgroup. Lateral process of anterior coxal fold (alp) slender, curving mesad; mesal process of anterior coxal fold (amp) as long as alp, slender, straight, directed distad. Similar in these respects to T. demangei . Differs from this species by having mesal margin of amp forming a strong longitudinal crest (lc) in posterior view, by having only one femoral spine (fe) and by having the spatulate lobe (sl) broad and rounded.

Etymology

The name is a Latin adjective, referring to the longitudinal crest on the mesal process of the anterior coxal fold.

Material examined

Holotype

THAILAND: ³, Songkhla Province, Rattaphum District, Srikasorn , 7°00'18" N, 100°08'24" E, 12 Jan. 2009, leg. P. Pimvichai, C. Sutcharit and members of the Animal Systematics Research Unit ( CUMZ-D00094 ).

Paratype

THAILAND: ³, same data as holotype ( CUMZ-D 00077).

Description

Adult males with 61–66 podous rings, no apodous rings. Length 16–17 cm, width 9.2–9.5 mm. Colour in life unknown; preserved specimens with head, antennae, prozona and legs brown; metazona, epiproct, paraprocts and hypoproct reddish brown.

GONOPODS ( Fig. 5 A–E). Anterior coxal fold (ac; Fig. 5A ): lateral process (alp) slender, curving mesad, with lateral serrate crest near tip ( Fig. 5C , arrow); mesal process (amp) as long as alp, slender, straight, directed distad, tip sharp, pointed, in posterior view mesal margin of amp forming strong longitudinal crest (lc). Posterior coxal fold (pc; Fig. 5B ) basally with moderately high lateral paracoxites (px), distally with two processes: mesal process (pmp) slender, directed anteriad; lateral process (plp) short, erect, digitiform; forming shelf for accommodation of telopodite. Telopodite ( Fig. 5 D–E) leaving coxite between pmp and plp; femoral spine (fe) long, curved downward, with expanded lamella at base; tibial spine (ti) very long, curving in horizontal plane, tip close to basal part of fe; small spine (ss) at base of apical part, opposite origin of tibial spine; spatulate lobe (sl) broad, rounded; a small accessory lobe (al) at base of sl; palette (pa) simple, gutter-like, with longitudinal crest (cr) at middle, distally with about twelve brownish blepharochaetae (bp).

DNA barcode

The GenBank accession number of the barcode of the paratype is KC519534 (voucher code CUMZ-D00077).

Distribution ( Fig. 12 )

Known only from the type locality.

Figures

Fig. 5. Thyropygus mesocristatus sp. nov., from Srikasorn, holotype (CUMZ-D00094), ³, gonopods. A. Anterior view, left telopodite removed. B. Posterior view, left telopodite removed. C. Lateral view. D. Left telopodite, posterior-mesal view. E. Left telopodite, anterior-lateral view.

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