Thyropygus undulatus sp. nov.

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Fig. 9 A–E

Diagnosis

A species of the opinatus subgroup. Lateral process (alp) flattened, slightly curved, its laterodistal margin coarsely dentate. Similar in this respect to T. cristagalli, T. implicatus and T. culter sp. nov. Differs from these species by having the mesal process of the posterior coxal fold (pmp) with two rounded distal lobes, visible in anterior view between alp and amp, and by having the tibial spine (ti) not ending in a sharp point.

Etymology

The name is a Latin adjective, referring to the undulate/coarsely dentate laterodistal margin of the lateral process of the anterior coxal fold.

Material examined

Holotype

THAILAND: ♂, Krabi Province, Muang District, Khao Phanom Bencha, 8°16'30" N, 98°55'30" E, 16 Jan. 2009, leg. P. Pimvichai, C. Sutcharit and members of the Animal Systematics Research Unit (CUMZ-D00087).

Paratypes THAILAND: 1 ♀, same data as holotype (CUMZ-D00099).

Description

Adult male with 63 podous rings, no apodous rings. Length 15 cm, width 8.7 mm. Adult female with 64 podous rings, no apodous rings. Length 14 cm, width 8.5 mm. Colour in life unknown; preserved specimens with head, legs, middorsal metazona, epiproct, paraprocts and hypoproct brown; antennae and metazona dark brown; prozona whitish-brown.

GONOPODS (Fig. 9 A–E). Anterior coxal fold (ac; Fig. 9A): lateral process (alp) flattened, curving mesad, its laterodistal margin coarsely dentate, terminating in a short spine, tip curving against tip of opposite side, lateral margins with serrate crest (Fig. 9C, arrow); mesal process (amp) much shorter than alp, slender, curving mesad. Posterior coxal fold (pc; Fig. 9B) basally with moderately high lateral paracoxites (px); mesal process (pmp) distally with two rounded lobes, visible in anterior view between alp and amp; lateral process (plp) erect, digitiform. Telopodite (Fig. 9 D–E) leaving coxite over shelf of posterior coxal fold; femoral spine (fe) duplicated, fe 1 relatively long, projecting above top of telopodite, curving backward, ending in slender barb, fe 2 basally broad, situated under fe 1, curving backward, ending in slender barb; tibial spine (ti) long, curving in horizontal plane, not ending in sharp spine; apical part: spatulate lobe (sl) rounded, with slender long spine (sls) at base of apical part, opposite origin of tibial spine; palette (pa) simple, distally with about eleven brownish blepharochaetae (bp).

DNA barcode

The GenBank accession number of the barcode of the holotype is KU306520 (voucher code CUMZ-D00087).

Distribution (Fig. 12)

Known only from the type locality.