Tokyosoma lobatum, Mikhaljova, Elena V., Golovatch, Sergei I. & Chang, Hseuh-Wen, 2010

Mikhaljova, Elena V., Golovatch, Sergei I. & Chang, Hseuh-Wen, 2010, The millipede family Diplomaragnidae in Taiwan, with descriptions of nine new species (Diplopoda, Chordeumatida), Zootaxa 2615, pp. 23-46 : 29-31

Tokyosoma lobatum sp. nov.

Figs 12–15 .

Material examined: Holotype: 1 male ( NMNS –6345–007), Taiwan, Nantou County, Meifeng, 24°06’ N, 121°12’ E, 2300 m, 5–6 September 2003, leg. G. Csorba & Z. Korsós. Paratypes: 2 females ( NMNS –6345– 008), same locality as in holotype, 5–6 September 2003, leg. G. Csorba & Z. Korsós.

Diagnosis: Differs from congeners mainly by the shape of the posterior gonopod lateral coxal branch with a blade-shaped distal portion, the middle portion being covered with microtubercles laterally, as well as in the shape of the posterior gonopod colpocoxite devoid of a lateral blade.

Description: Male. Length about 17 mm, width with paraterga about 1.5 mm. Coloration in alcohol pale brown with a broad, transverse, marbled brown band on each meta- and prozonite. Legs with marbled brown distal parts. Venter and lower portion of pleura pale. Head brown with marbled brown spots and bands. Ocellaria black. Antennae brown with dark brown proximal parts.

Body with 32 segments. Head densely covered both with long and short setae. Each eye patch composed of at least 26 ocelli. Collum semi-circular. Body width gradually increasing until somite 7, body parallel-sided on somites 8–15(16), thereafter gradually tapering. Beginning from somite 4, paraterga normally developed, growing increasingly less distinct towards hind part of body, strongly reduced on somites 27 and 28, absent from somites 29–31. Paraterga of somites 2 and 3 small. Metazonital macrochaetae in a transverse row on somite 31, like an elongate (to different degrees) triangle on preceding somites. Nearly all macrochaetae broken off, remaining ones long, pointed apically.

Leg pairs 3–7 somewhat enlarged. Leg pair 3 without tarsal papillae, claw at base with one small additional claw dorsally and a short, thin, setiform filament ventrally. Leg pairs 4–7 with funnel-shaped tarsal papillae (in distal portion of leg pair 4, apically near claws in leg pairs 5–7). Claw of leg 4 broken off. Claw of leg 5 at base with a tiny additional claw dorsally and a long setoid filament ventrally. Claw of legs 6 and 7 at base without dorsal additional claws, but with a long setoid filament ventrally. Postgonopodal legs (including leg pairs 10 and 11) without tarsal papillae. Claw of legs 10 and 11 at base with one small additional claw dorsally and a long setoid filament ventrally. Claw of midbody and hindmost legs at base with one small additional claw dorsally and a long setoid filament ventrally.

Legs 10 and 11 with coxal glands. Coxa 10 with a caudoventral, somewhat flattened, setose and microtuberculate process with an anteriad somewhat curved apex, and with a small, front, subapical outgrowth ( Fig. 12 ). Trochanter 10 with a tiny ventral outgrowth setose apically. Coxa 11 covered with low papillae mainly caudally, with only a tiny, anteroventral, flat outgrowth ( Fig. 13 ). Trochanter 11 with a caudal process papillate mesally and rounded apically.

Anterior gonopod telopodite 1-segmented, flagelliform, beset with cuticular spinules, its distal part positioned inside sheaths with elevated edges ( Fig. 14 ). Telopodite base and distal part of coxosternum attached to adjacent mesal portion of posterior gonopod. Posterior gonopod colpocoxites fused sub-basally, curved posteriad distally. Mesal sheath processes of posterior gonopod colpocoxites fused medially into a single cup-shaped structure (ms) carrying pointed spinules caudally, with a middle spine. Lateral sheath processes (lp) cup-shaped, covered with tiny pointed spinules mesocaudally.

Posterior gonopod angiocoxite with a globule, but without process in posterior view. Posterior gonopod coxal part with a long, lateral, flat branch (lb) curved anteromesally. Distal portion of the branch bladeshaped, middle portion microtuberculate laterally. Basal part of this branch fused with both colpocoxite and anterior angiocoxite.

Angiocoxite depressed centrally in anterior view ( Fig. 15 ), supplied with a long process (ap); distal portion of this process penetrating colpocoxite and visible outside in anterolateral view. Apex of anterior angiocoxal process curved caudad and visible in posterior view. Posterior gonopod telopodite 2-segmented, with a short and thin femur.

Female. Length 18–19 mm, width with paraterga 1.5–1.6 mm. Body with 32 segments. Nonsexual characters as in male. Vulvae not dissected.

Name: The specific epithet refers to the blade-shaped distal portion of the lateral coxal branch of the posterior gonopod.

Figures

FIGURES 12 – 15. Tokyosoma lobatum sp. nov., male holotype. 12, coxa and trochanter 10, front view; 13, coxa and trochanter 11, caudal view; 14, gonopods, caudal view; 15, gonopods, front view; ms, mesal sheath processes of posterior gonopod colpocoxites; lp, lateral sheath process of posterior gonopod colpocoxite; lb, posterior gonopod lateral coxal branch; ap, anterior process of posterior gonopod angiocoxite. Scale in mm.