Thyropygus erectus Pimvichai, Enghoff & Panha, 2009, n. sp.

Thyropygus erectus n. sp.

(Figs. 16 A–D, 19C)

Material: HOLOTYPE male THAILAND, Satun Province, La-Ngu district, Koh Tarutao, 6° 49ˏ 36˝ N, 99° 38ˏ 30˝ E. 6 April 2008. P. Pimvichai, P. Prasankok, P. Tongkerd, R. Chanabun and Suwit Lhaokhum leg., (CUMZ). – Paratypes: 10 females, same data as holotype (CUMZ).

Etymology: The species epithet is a Latin adjective and refers to the erect femoral spine of the gonopod telopodite.

Diagnosis: A species of the opinatus subgroup. Spatulate lobe (sl) at the apical part of telopodite terminating in a sharp brown spine. Similar in this respect to T. opinatus, T. floweri and T. implicatus. Differs from these species by having the femoral spine (fe) directed distad and by having the mesal process of posterior coxal fold (pmp) flattened, curved distolaterad.

Description: Adult male with 56 podous rings, no apodous rings. Length ca. 7 cm, width ca. 4.3 mm. Adult females with 53–58 podous rings, no apodous rings. Length ca. 8–10 cm, width ca. 4.6–5.6 mm. Overall color of living animal (Fig. 19 C) brown with a longitudinal orange band mid-dorsally on the body. Legs and antennae pale pink. Epiproct and margins of paraprocts yellow.

Gonopods (Figs. 16 A–D): Anterior coxal fold (ac) (Fig. 16 A): lateral process (alp) long, slender, regularly curved, tip close to tip of opposite alp, the two together forming a circle; mesal process (amp) almost as long as alp, straight, directed distad. Posterior coxal fold (pc) (Fig. 16 B) with lateral paracoxites (px) quite low, lateral process (plp) digitiform; mesal process (pmp) flattened, curved distolaterad. Telopodite (Figs. 16 C–D) leaving coxite between pmp and plp; femoral spine (fe) situated on the broad rounded lobe, directed distad, in situ resting close to amp; tibial spine (ti) very long, slender, curving in horizontal plane, its tip close to base of fe, in situ resting between amp and alp; apical part: spatulate lobe (sl) with a sharp dark brown spine at tip; palette (pa) simple, distally with about six brownish blepharochaetae (bp).

Distribution (Fig. 20): Known only from the type locality.