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

Pimvichai, Piyatida, Enghoff, Henrik & Panha, Somsak, 2011, A revision of the Thyropygus allevatus group. Part 3: the T. induratus subgroup (Diplopoda: Spirostreptida: Harpagophoridae), Zootaxa 2941, pp. 47-68 : 58-60

Thyropygus dormiens n. sp.

( Figs. 6 A–D)

Thyropisthus quietus: Demange 1961: 146 , 147, figs. 193–194

Material examined. HOLOTYPE male THAILAND, Kao Seming. 13 January 1960 ( USNM).

Etymology. The specific epithet is a Latin verb in the present participle, meaning “sleeping” and refers to the similarity of this species to T. quietus the specific epithet of which means "calm", "quiet", or "at rest".

Diagnosis. A species of the induratus subgroup. Telopodite with a round lobe (lo) projecting distolaterad distally to fe. Similar in this respect to T. laterolobatus . Differs from all other species of the T. induratus subgroup by having the anterior coxal fold (ac) distomesally produced into a narrow, pointed, distad process with a smaller process on its distolateral margin.

Description. Adult male with 58 podous rings, no apodous rings. Length ca. 12 cm, width ca. 8.2 mm. Color in life unknown; preserved specimen with prozona whitish-brown, metazona, head, antennae, legs, epiproct and hyproproct brown.

Gonopods ( Figs. 6 A–D): Anterior coxal fold (ac) ( Fig. 6 A) basally narrow, gradually widening towards tip, distolaterally rounded, distomesally produced into narrow, pointed, distad, process with a smaller process on its distolateral margin. Posterior coxal fold (pc) ( Fig. 6 B) basally with extremely high lateral paracoxites (px); mesal process (pmp) extremely high, rounded, distally directed laterad with a small crest fused to and reaching over the distolateral margin of ac. Telopodite ( Figs. 6 C–D) leaving coxite over shelf (sh) of posterior coxal fold; femoral spine (fe) long, slender, ending in sharp point, in situ curving behind tip of apical part of ac; telopodite distally to fe with a relatively large, broad, round lobe (lo); tibial spine (ti) very long, slender, curving in an oblique-sagittal plane, in situ resting between the two ac; apical part: lamellar lobe (ll) flattened, broadly expanded, rounded, transparent; palette (pa) simple, basally with an uncate subterminal lobe (usl) ventrally; distally with about four brownish blepharochaetae (bp).

Distribution ( Fig. 11 ). Demange (1961) gave the locality as Kao Seming, but there is no locality label in the vial containing the unique holotype. Enghoff (2005) interpreted the locality as Khao Saming, 50 Km NE of Trat.

Discussion. This specimen was identified as Thyropisthus quietus ( Attems, 1938) by Demange (1961, fig. 193, 194). Demange’s identification label is dated March 1960, but the type vial also contains a label stating ““ Thyropisthus ” n. sp. near resimus , punctatus , quietus , det. RLH [= R.L. Hoffman] 1/13/60 ”. According to our studies of quietus SYNTYPES in NMW, all gonopod details of this specimen are completely different from quietus , so in agreement with Hoffman’s label we propose regarding this specimen as representing a new species.

Figures

FIGURE 6. Thyropygus dormiens, holotype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, posterior-mesal view. D: left telopodite, anterior-lateral view.

FIGURE 11. Known distribution of the Thyropygus induratus subgroup.