Thyropygus jarukchusri, Pimvichai, Piyatida, Enghoff, Henrik & Panha, Somsak, 2011

Thyropygus jarukchusri View in CoL n. sp.

( Figs. 4 View FIGURE 4 A–D, 5C)

Material examined. HOLOTYPE male THAILAND, Roi-Et Province, Chaturaphakphiman district, Ban Nong Phue, 15° 49ˏ 34˝ N, 103° 31ˏ 11˝ E. 12 April 2009. J. Pimvichai, C. Pimvichai and P. Pimvichai leg., ( CUMZ). – Paratypes: 21 males, 6 females, same data as holotype ( CUMZ, ZMUC).

Etymology. The specific epithet is a combination of the names of PP’s parents, in recognition of their support. The name is to be treated as a noun in apposition.

Diagnosis. A species of the cuisinieri subgroup. Differing from all other species in the subgroup by smaller body size and by having the tibial spine ( ti) distinctly constricted at base.

Description. Adult males with 57–59 podous rings, no apodous rings. Length ca. 6 cm, width ca. 3.9–4.4 mm. Adult females with 56–60 podous rings, no apodous rings. Length ca. 7–9 cm, width ca. 5.0– 5.2 mm. Overall color of living animal ( Fig. 5 View FIGURE 5. A, B C) brownish orange, with anterior metazona dark brown.

Gonopods ( Figs. 4 View FIGURE 4 A–D): Anterior coxal fold ( ac) ( Fig. 4 View FIGURE 4 A) basally almost parallel-sided, becoming broader towards tip, with a prominent projecting lobe ( apl) on the lateral surface; distally with two processes: a lateral slen- der, sharp spine, curving mesad, and a mesal, broadly expanded, terminally pointed process pointing distad. Posterior coxal fold ( pc) ( Fig. 4 View FIGURE 4 B) basally with relatively high lateral paracoxites ( px); mesal process ( pmp) a short, rounded, slightly twisted lamella; lateral process ( plp) a small, thumblike, directed distolaterad. Telopodite ( Figs. 4 View FIGURE 4 C–D) leaving coxite over shelf of posterior coxal fold between pmp and plp; femoral spine ( fe) long, curving mesad, without crenulated along inner curvature, in situ resting against posterior surface of ac, telopodite distally to fe with a round lobe ( lo) projecting distolaterad, further distally with an additional small round lobe ( asl); tibial spine ( ti) very long, slender, distinctly constricted at base, with longitudinal crest ( lc) along outer surface, recurved, its tip in situ resting close to lo; apical part with a slender, sharply pointed, transparent lamellar lobe ( sll); palette ( pa) simple, flattened; distally with about four to seven brownish blepharochaetae ( bp).

Distribution ( Fig. 6 View FIGURE 6 ). Known only from the type locality, where it co-exists with T. foliaceus . Although these taxa are quite similar, there are clear difference in gonopod structure, body size ( Fig. 7 View FIGURE 7 ) and color. Furthermore, T. foliaceus and T. jarukchusri showed a divergence in COI sequences by 11.2% (74 out of 658 positions) (cf. discussion in Pimvichai et al., 2011). We regard T. jarukchusri and T. foliaceus as a sympatric species (their strict sympatry excludes the possibility of treating them as subspecies).