Thyropygus mesocristatus sp. nov.

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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: ♂, 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: ♂, same data as holotype (CUMZ-D00077).

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.