A revision of the Thyropygus allevatus group. Part 1: the T. opinatus subgroup (Diplopoda: Spirostreptida: Harpagophoridae) Author Pimvichai, Piyatida Author Enghoff, Henrik Author Panha, Somsak text Zootaxa 2009 2016 17 50 journal article 10.5281/zenodo.185971 1db39382-b4f0-46fa-ae08-dd5e57e0e26b 1175-5326 185971 Thyropygus cristagalli n. sp. ( Figs. 15 A–D, 19B) Material: HOLOTYPE male THAILAND , Phang Nga Province, Koh Yao district, Koh Yao Noi, 8° 0 6ˏ 45˝ N, 98° 36ˏ 6˝ E. 2 May 2007 . P. Pimvichai and P. Prasankok leg., ( CUMZ ). – Paratypes : 7 males , 8 females , same data as holotype ( CUMZ ), 2 males , 2 females , same data as holotype ( ZMUC ). Etymology: The species epithet is a Latin noun in apposition, meaning cockscomb, and refers to the shape of the lateral process of the anterior gonopod coxal fold ( alp ). Diagnosis: A species of the opinatus subgroup. Spatulate lobe ( sl ) at the apical part of telopodite rounded, spoon-like. Similar in this respect to T. inflexus , T. bearti T. chelatus , T. brachyacanthus and T. loxia . Differs from all other species of the T. opinatus subgroup by having the femoral spine ( fe ) doubled, and by having the laterodistal margin of the lateral process of the anterior coxal fold ( alp ) coarsely serrate, cockscomb-like. Description: Adult males with 61 podous rings, no apodous rings. Length ca. 11–14 cm , width ca. 7.6–7.9 mm . Adult females with 56–61 podous rings, no apodous rings. Length ca. 8–12 cm , width ca. 6.6–7.7 mm . Overall color of living animal ( Fig. 19 B) brown with a longitudinal reddish band mid-dorsally on the body. Legs, head, and antennae darker brown. FIGURE 15. Thyropygus cristagalli , paratype, gonopods. A: anterior view, left telopodite removed. B: posterior view, left telopodite removed. C: left telopodite, anterior view. D: left telopodite, posterior view. Gonopods ( Figs. 15 A–D): Anterior coxal fold ( ac ) ( Fig. 15 A): lateral process ( alp ) flattened, slightly curved, its laterodistal margin coarsely dentate, terminating in a short, pointed spine; an additional spine-like process ( aip ) between alp and amp , aip in lateral view broadly triangular; mesal process ( amp ) much shorter than alp , directed distad, curving very slightly mesad, pointed. Posterior coxal fold ( pc ) ( Fig. 15 B) basally with moderately high lateral paracoxites ( px ), distally truncate, forming shelf ( sh ) for accommodation of telopodite; Telopodite ( Figs. 15 C–D) leaving coxite over shelf of posterior coxal fold; femoral spine ( fe ) duplicated, one spine ( fe 1) much smaller than the other, basally broad and erect, ending in a slender barb, the second ( fe 2) longer and thicker than fe 1, situated under fe 1, almost straight, slightly sigmoid, its tip in situ resting close to the middle part of ac ; tibial spine ( ti ) long, slender and recurved, curving in horizontal plane, its tip in situ resting at the base of amp ; apical part: spatulate lobe ( sl ) basally slender, distally expanded, rounded, slightly twisted; a small slender spine ( ss ) at base of apical part, opposite the origin of the tibial spine; palette ( pa ) simple, in the middle with a small lateral lamella, distally with about twelve brownish blepharochaetae ( bp ). Distribution ( Fig. 20 ): Known only from the type locality.