Plusioglyphiulus sutchariti, 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 : 12-16

Plusioglyphiulus sutchariti sp. n. Figs 8−11 .

Material examined: Holotype male ( MNHN GA 064 ), Thailand, Phrae Prov., Rong Kuang Distr., Cave Tham Pha Nang Khoi , 230 m a.s.l., 29 November 2009, leg. C. Sutcharit and members of the Animal Systematics Research Unit . Paratypes: 1 male, 1 juvenile ( MNHN GA 064 ) , 1 female ( SEM), same locality, together with holotype .

Name: Honours Dr. Chirasak Sutcharit, one of the collectors and an important member of the Animal Systematics Research Unit at Chulalongkorn University, Bangkok, Thailand.

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

Description: Length of holotype about 40 mm, width 1.7 mm, with 69p+2a+T. Male paratype about 28 mm long, 1.2 mm wide, with 57+5a+T. Juvenile about 16 mm long and 1.0 mm wide, with 50+5a+T. Coloration of adults uniformly light to dark grey-brown; antennae yellowish to light brown; legs yellowish to red-brown; juvenile uniformly light grey-brown.

All characters as in P. panhai sp. n. ( Figs 8E–F , 9C–E, G , 10 , 11F ), except as follows. Antennae slightly shorter and more clavate ( Figs 8A , 11A ). Ocellaria large, blackish, ovoid in shape, in adults with about 18 ocelli arranged in five longitudinal rows (in juvenile in three rows of 3+2+1 ocelli, counting from bottom). Gnathochilarium ( Figs 9A , 11B ) rather oligotrichous, with a separate promentum (n=2).

Postcollum constriction very evident, due to especially enlarged collum and segment 2 ( Figs 8D , 9B ). Carinotaxy formula of collum either //(t)+1p/(t)/(t)+//(t)+2p/(t)/(t)/(t)+3p/(t)/(t)+t/(t)/(t)+4p/(t)/(t)+P+//ma or //t+1p//t+2p/ (t)/(t)+3p/(t)/(t)+/t/t+pp/t/t+ma ( Figs 8A, D ). Carinotaxy of metaterga 2–4, 7/7+m+7/7; usual formula of following metaterga, 3/3+I/i+3/3/3+m/m/m (including juvenile), rarely on some segments 4/4+I/i+3/3/3+m/m/m ( Figs 8A–C , 9F ); all crests and tubercles, including poriferous cones, rather low. Midbody segments ovoid in cross-section, slightly compressed laterally ( Fig. 9F ).

Male legs 1 with a usual strong central hook, appendages 2-segmented ( Figs 9B , 11C ). Male legs 2 as usual, very strongly enlarged, telopodite hirsute on frontal face; penes subconical, truncate apically, fused at base, bare ( Figs 9B , 11D ).

Anterior gonopods rather complex, with a paramedian pair of anterior coxosternal processes (cxp1), high, slen- der, poorly setose, contiguous and digitiform; pair of posterior coxosternal processes (cxp2) even higher, distally retrorse and apically subunciform; telopodites (te) club-shaped, densely setose, nearly as high as cxp2, attached to coxal region on caudal face, probably capable of movement ( Fig. 11G ). Posterior gonopods smaller, rather simple, coxites well separated from sternum, each finely fringed apically and surmounted by an evident fovea flanked by a velum; telopodites missing ( Fig. 11H ).

Figures

FIGURE 8. Plusioglyphiulus sutchariti sp. n., female 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 9. Plusioglyphiulus sutchariti sp. n., female paratype. A: gnathochilarium, ventral view. B: anterior part of body with removed head, ventral view. C: midbody segments, ventral view. D: posterior part of body, ventral view. E: same, caudal view. F: cross-section of a midbody segment, caudal view. G: enlarged ozopore region, lateral view. Scale bars: A, 0.1 mm; B–E, 0.2 mm; F, 0.5 mm; G, 0.05 mm.

FIGURE 10. Plusioglyphiulus sutchariti sp. n., female paratype. A: midbody leg, lateral view; B, enlarged claw, lateral view. Scale bars: A, 0.1 mm; B, 0.01 mm.

FIGURE 11. Plusioglyphiulus sutchariti sp. n., male paratype. A: antenna, lateral view. B: gnathochilarium, ventral view. C: leg 1, front view. D: leg 2, caudal view. E: leg 3, caudal view. F: midbody leg. G: anterior gonopods, front view. H: right posterior gonopod, caudal view. te: telopodite; cxp1: anterior coxosternal process; cxp2: posterior coxosternal process. Scale bar: A– F, 0.4 mm; G and H, 0.2 mm.