Thyropygus culter Pimvichai & Enghoff & Panha & Backeljau 2016, sp. nov.

Thyropygus culter sp. nov.

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Fig. 3 A–D

A species of the opinatus subgroup. Lateral process of anterior coxal fold (alp) flattened, slightly curved, its laterodistal margin coarsely dentate. Similar in this respect to T. cristagalli, T. implicatus and T. undulatus sp. nov. Differs from these species by having the mesal process of posterior coxal fold (pmp) very high, pointed-triangular, directed almost straightly distad, and by having the tibial spine (ti) recurved.

The name is a Latin noun in apposition, meaning “knife”, and refers to the knifelike second femoral spine (fe 2).

Holotype

THAILAND: ³, Krabi Province, Khlong Thom District, Rorn waterfall, 7°56'06" N, 99°12'18" E, 15 Jan. 2009, leg. P. Pimvichai, C. Sutcharit and members of the Animal Systematics Research Unit (CUMZ-D00091).

Paratypes

THAILAND: 3 ³³, 2 ♀♀, 1 subadult ♀, same data as holotype (CUMZ-D 00078); 1 ³, 1 ♀, same data as holotype (ZMUC).

Adult males with 58–62 podous rings, no apodous rings. Length 12–14 cm, width 7.1–8.0 mm. Adult females with 59–62 podous rings, no apodous rings. Length 11–13 cm, width 6.9–7.9 mm. Colour in life unknown; preserved specimens with head, antennae, prozona, middorsal metazona and legs brown; metazona, epiproct, paraprocts and hypoproct reddish brown.

GONOPODS (Fig. 3 A–D). Anterior coxal fold (ac; Fig. 3A): lateral process (alp) flattened, slightly curved, its laterodistal margin coarsely dentate, terminating in short, sharp, pointed spine; mesal process (amp) much shorter than alp, directed distad, tip curving mesad, pointed. Posterior coxal fold (pc; Fig. 3B) basally with lateral paracoxites (px) quite low, distally with two processes: mesal process (pmp) very high, pointed-triangular, directed almost straightly distad; lateral process (plp) much shorter, digitiform, directed distad and slightly laterad. Telopodite (Fig. 3 C–D) leaving coxite over shelf of posterior coxal fold; femoral spine (fe) duplicated, fe 1 projecting above top of telopodite curvature, curving backward, ending in slender barb, fe 2 basally broad, situated under fe 1, curving backward, ending in slender barb; tibial spine (ti) long, slender and recurved (not curving in horizontal plane); apical part: spatulate lobe (sl) slender, rounded; with slender, long spine (sls) at base of apical part, opposite origin of tibial spine; palette (pa) simple, distally with about twelve brownish blepharochaetae (bp).

The GenBank accession number of the barcode of one of the paratypes is KC519535 (voucher code CUMZ-D00078).

Distribution (Fig. 12)

Known only from the type locality.