Diplomaragna dentifer, Mikhaljova, 2021

Mikhaljova, Elena V., 2021, The millipede family Diplomaragnidae Attems, 1907 in the Asian part of Russia with the descriptions of two new genera and seven new species (Diplopoda, Chordeumatida), Zootaxa 5060 (1), pp. 1-44 : 12-13

Diplomaragna dentifer sp. nov.

Figs 8–12

Material examined. Holotype: male ( FSCB), Russia, environs of Khabarovsk, 48°18.467´N, 135°04.641´E, 170 m a.s.l., 1.X.2005, leg. Yu.M. Marusik. Paratypes: 2 males, 3 females, 1 juvenile ( FSCB), same locality as in holotype, 1.X.2005, leg. Yu.M. Marusik.

Diagnosis. Differs from congeners mainly by the presence of the subbasal process-tooth (t, Figs 9–10 ) on the gonopod posterior angiocoxal process.

The species seems to be particularly similar to Diplomaragna zimoveinaya and D. budilovi sp. nov. but differs in the configuration of the gonopod posterior angiocoxal processes with subbasal process-tooth (t, Figs 9–10 ) (vs absent in both) and ribbed distal edge (vs not ribbed in both), by the not flagelliform distal part of the gonopod colpocoxite (vs flagelliform in D. zimoveinaya but not flagelliform in D. budilovi sp. nov.) as well as by the medium length of the distal segment of the posterior gonopod telopodite (vs elongate in D. zimoveinaya , of relatively short in D. budilovi sp. nov.).

Description. Male. Length 13–14 mm, width about 1.5 mm with paraterga. Coloration in alcohol beige (discoloration in alcohol is possible). Distal parts of anterior legs marbled brownish. Antennae brown. Eye patches black, with at least 30 ocelli.

Body with 32 rings. Collum semicircular. Both collum and ring 2 narrower than head with genae. Ring 2 somewhat wider than collum. Paraterga beginning on ring 2, well developed on rings 5–27, reduced on rings 28, onward missing. Metazonital macrochaetae in a transverse row on rings 30–31, like an extended triangle on preceding somites. Anterolateral macrochaetae shortest, clavate. Caudolateral macrochaetae longest. Medial and caudolateral macrochaetae pointed, but not very sharply so. Axial suture relatively well-developed.

Legs long and slender. Leg pairs 1 and 2 typically reduced in size, with usual tarsal brushes. Other pregonopodal legs practically not enlarged. Leg pairs 3–7 with group of funnel–shaped tarsal papillae apically near claw. Claw of leg pairs 3–7 at base with a setoid outgrowth ventrally but without additional claws dorsally. Postgonopodal legs (including leg pairs 10 and 11) without tarsal papillae. Claw of postgonopodal legs at base with a long setoid outgrowth ventrally only.

Legs 10 and 11 with coxal glands. Coxae and trochanters 10 unmodified. Coxa 11 with very low broad outgrowth; trochanter 11 unmodified.

Gonopods as in figs 8–11.Anterior gonopod telopodites flagelliform,covered with tiny spinules at least subbasally, positioned on posterior surface of posterior gonopod colpocoxites inside a shallow, open-edged sheathing groove. Colpocoxites fused medially in basal half; their distal parts slightly curved caudally, tips hooked. Each colpocoxite entire. Colpocoxite sheath groove without evident processes. Posterior gonopod angiocoxites with subglobules in posterior view, depressed centrally in anterior view. Posterior angiocoxal process (pp, Fig. 8 ) broad, in the form of a thin, frontally curved ribbed plate with a process-tooth (t, Figs 9–10 ) subbasally. Anterior angiocoxal process (ap, Fig. 11 ) long, flagelliform and curved, its distal part hidden by a colpocoxital fold. Posterior gonopod telopodite 2-segmented, setose; distal segment of medium length.

Female. Length 13–14 mm, width with paraterga about 1.5 mm. Body with 32 rings. Eye patch with about 30 ocelli. Other nonsexual characters as in male. Vulvae small, near ovoid ( Fig. 12 ).

Etymology. The specific epithet refers to the subbasal tooth (= process) of the posterior gonopod posterior angiocoxal process, an adjective in apposition.

Figures

FIGURES 8–12. Diplomaragna dentifer sp. nov., male, female paratypes. 8, gonopods, caudal view; 9, 10, posterior angiocoxal processes; 11, gonopods, front view; 12, vulvae, ventral view; pp, posterior angicoxal process; t, process-tooth; ap, anterior angiocoxal process. Scales: 20 μm (Figs 9–10), 100 μm (Figs 8, 11–12).