Plusioglyphiulus wat, 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 : 28-31

Plusioglyphiulus wat sp. n. Figs 24−27 .

Material examined: Holotype male ( MNHN GA 066 ), Thailand, Chantaburi Prov., Kao Cha Mao Distr., Wat Bathun , cave, 13°07’26”N, 101°35’51”E, 80 m a.s.l., 24 November 2010, leg. S. Panha & N. Likhitrakarn. Paratypes: 4 males, 2 females ( MNHN GA 066 ) , 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: To emphasize “wat”, in Thai meaning “temple”, as the type locality, a noun in apposition.

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

Description: Length 27–44 mm, width 1.4–2.0 mm, segments in posterior third of body being broadest. Coloration uniformly dark grey-brown to light castaneous brown; antennae and collum often lighter, usually brown; metatergal crests and, especially, poriferous tubercles often infuscate.

Body with 56–75p+6–2a+T. Length of holotype about 42 mm, width 2.0 mm, with 74p+2a+T.

All characters as in P. panhai sp. n. ( Figs 24E, F , 25B–D, F , 26B ), except as follows. Ocellaria large, blackish, ovoid in shape, with about 17–22 ocelli arranged in 4–6 longitudinal rows. Antennomere 5 with a nearly complete corolla of numerous bacilliform sensilla at distal margin ( Fig. 27A ). Gnathochilarium ( Figs 26A , 27B ) rather oligotrichous, with a separate promentum (n=2).

Postcollum constriction very evident, due to especially enlarged collum and segment 2 ( Figs 24A, D ). Carinotaxy formula of collum: /(t)/(t)+/t/+1p/t+2p/t+3p/t+//t+pp/t+/ma ( Figs 24A, 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/m ( Figs 24A–C , 25E ); all crests and tubercles, including poriferous cones, rather low. Midbody segments ovoid in cross-section, slightly compressed laterally ( Fig. 25E ).

Male legs 1 ( Fig. 26C ) with a usual strong central hook curved forward, appendages larger, sac-shaped, with a few setae mesally near base, 1-segmented. Male legs 2 strongly enlarged ( Fig. 26C ).

Anterior gonopods rather complex, with a paramedian pair of anterior coxosternal processes (cxp1), relatively low, slender, subcontiguous, digitiform, setose, subterminally supplied with a tooth on caudal face; caudal pair of coxosternal processes (cxp2) considerably higher, evidently twisted and pointed; telopodites (te) club-shaped, densely setose apically, evidently shorter than cxp2, attached to coxal region caudolaterally, probably capable of movement ( Figs 26D, E , 27C ). Posterior gonopods considerably shorter, rather complex, coxites well separated from sternum, fused only basally, lobe-shaped and obliquely subtruncate, membranous, each surmounted on frontal face by an evident fovea devoid of clear-cut flagella nearby; telopodites virtually missing ( Figs 26F , 27D ).

Figures

FIGURE 24. Plusioglyphiulus wat 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–E, 0.5 mm; F, 0.2 mm.

FIGURE 25. Plusioglyphiulus wat sp. n., male paratype. A: anterior part of body, ventral view. B: midbody segments, ventral view. C: posterior part of body, ventral view. D: same, caudal view. E: cross-section of a midbody segment, caudal view. F: enlarged ozopore region, lateral view. Scale bars: A, B and E, 0.5 mm; C and D, 0.2 mm; F, 0.1 mm.

FIGURE 26. Plusioglyphiulus wat sp. n., male paratype. A: gnathochilarium, ventral view. B: enlarged claw, lateral view. C: legs 1−3, subventral view. D: anterior gonopods, caudal view. E: same, front view. F: posterior gonopods, caudal view. Scale bars: A, 0.2 mm; B, 0.02 mm; C−E, 0.1 mm; F, 0.05 mm.

FIGURE 27. Plusioglyphiulus wat sp. n., male paratype. A: antenna, lateral view. B: gnathochilarium, ventral view. C: left anterior gonopod, caudal view. D: posterior gonopods, front view. Scale bar: 0.2 mm.