Plusioglyphiulus likhitrakarni, Golovatch & Geoffroy & Mauriès & Vandenspiegel, 2011

Golovatch, Sergei I., Geoffroy, Jean-Jacques, Mauriès, Jean-Paul & Vandenspiegel, Didier, 2011, The millipede genus Plusioglyphiulus Silvestri, 1923 in Thailand (Diplopoda, Spirostreptida, Cambalopsidae) 2940, Zootaxa 2940 (1), pp. 1-63 : 16

Plusioglyphiulus likhitrakarni sp. n. Figs 12−15 .

Material examined: Holotype male ( MNHN GA 030 ), Thailand, Sa Kaew Prov., Khlong Hat Distr., Cave Tham Phet Po Tong , 13°24’47”N, 102°19’32”E, 220 m a.s.l., guano, 28 October 2010, leg. S. Panha & N. Likhitrakarn. Paratypes: 7 males, 5 females ( MNHN GA 030 ) , 1 male, 1 female ( ZMUM) , 1 male, 1 female ( ZMUC) , 1 male, 1 female ( MZCU) , 1 male, 1 female ( NMNHS) , 1 male ( SEM) , same locality, together with holotype .

Name: Honours Natdanai Likhitrakarn, one of the collectors, our colleague myriapodologist and another active member of the Animal Systematics Research Unit at Chulalongkorn University, Bangkok, Thailand.

Diagnosis: Differs from congeners in the oligotrichous gnathochilarium, coupled with the peculiar carinotaxy patterns, and the special shapes and armature of both gonopod pairs (see also Key below).

Description: Length 22–50 mm, width 1.3–2.0 mm, midbody segments being broadest. Coloration uniformly dark grey-brown to castaneous brown; antennae and collum lighter, usually yellow-brown; metatergal crests and, especially, poriferous tubercles often infuscate.

Body with 53–80p+5–2a+T. Length of holotype about 50 mm, width 2.0 mm, with 80p+1a+T.

All characters as in P. panhai sp. n. ( Figs 12E, F , 13A, C–E , 14A–C , 15A ), except as follows. Ocellaria large, blackish, ovoid in shape, with about 15–22 ocelli arranged in 5–6 longitudinal rows. Gnathochilarium ( Figs 13B , 15B ) rather oligotrichous, with a separate promentum (n=2).

Postcollum constriction very evident, due to especially enlarged collum and segment 2 ( Figs 12A, D ). Carinotaxy formula of collum: //(t)+1p//t+/(t)/t+2p//t+/(t)/t+3p//(t)/t+/(t)/t+4p/(t)/t+pp/t (or pp/(t)/t)+/ma/ma/m ( Figs 12A, D ). Carinotaxy of metaterga 2–4, 7/7+m/m+7/7; usual formula of following metaterga until about caudal third of body, 3/3+I/i+3/3/3+m/m/m, thereafter, 4/4+I/i+3/3/3+m/m ( Figs 12A–C , 13F ); all crests and tubercles, including poriferous cones, rather low. Midbody segments ovoid in cross-section, slightly compressed laterally ( Fig. 13F ).

Male legs 1 with a usual strong central hook curved forward, appendages larger, sac-shaped, densely setose, 1- segmented. Male legs 2 strongly enlarged.

Anterior gonopods rather complex, with a paramedian pair of anterior coxosternal processes (cxp1), high, slen- der, setose only apically and curved anteriad, contiguous and digitiform; pair of posterior coxosternal processes (cxp2) still higher, distally torsate and lobiform; telopodites (te) club-shaped, densely setose distally, slightly shorter than cxp2, attached to coxal region caudolaterally, probably capable of movement ( Figs 14D, E , 15C ). Posterior gonopods shorter, complex, coxites well separated from sternum, fused only basally, each surmounted by an evident fovea flanked by a plumose flagellum, with another, simple flagellum a little basally on caudal face; telopodites virtually missing ( Figs 14F , 15D ).

Figures

FIGURE 12. Plusioglyphiulus likhitrakarni sp. n., male paratype. A: anterior part of body, lateral view. B: midbody segments, lateral view. C: posterior part of body, lateral view. D: anterior part of body, dorsal view. E: midbody segments, dorsal view. F: posterior part of body, dorsal view. Scale bars: A–F, 0.2 mm.

FIGURE 13. Plusioglyphiulus likhitrakarni sp. n., male paratype. A: anterior part of body, ventral view. B: gnathochilarium, ventral view. C: midbody segments, ventral view. D: posterior part of body, ventrocaudal view. E: same, dorsocaudal view. F: cross-section of a midbody segment, caudal view. Scale bars: A, C–F, 0.2 mm; B, 0.1 mm.

FIGURE 14. Plusioglyphiulus likhitrakarni sp. n., male paratype. A: segment 7, sublateral view. B: enlarged ozopore region, lateral view. C: enlarged claw, sublateral view; D: anterior gonopods, front view. E: same, ventrocaudal view. F: posterior gonopods, caudolateral view. Scale bars: A, B, D and E, 0.1 mm; C, 0.01 mm; F, 0.05 mm.

FIGURE 15. Plusioglyphiulus likhitrakarni sp. n., male paratype. A: antenna, lateral view. B: gnathochilarium, ventral view. C: left anterior gonopod, front view. D: posterior gonopods, front view. te: telopodite; cxp1: anterior coxosternal process; cxp2: posterior coxosternal process. Scale bar: 0.2 mm.