Diplomaragna budilovi, 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 : 10-11

Diplomaragna budilovi sp. nov.

Figs 3–7

Material examined. Holotype: male ( FSCB), Russia, Khabarovsky Krai, Nanaysky District , basin of Lake Gassi , near Tukhala River , Betula forest with Picea , 337.7 m a.s.l., 5–9.VIII.2011, leg. P. V. Budilov .

Diagnosis. Differs from congeners mainly by the gonopod posterior angiocoxal process in the form of a thin, frontally curved plate with an elongated mesal pointed horn apically.

The species seems to be particularly similar to Diplomaragna zimoveinaya and D. dentifer sp. nov. but differs in the configuration of the gonopod posterior angiocoxal processes ( Figs 4, 7 ) with an elongated mesal horn (c, Fig. 7 ) apically (vs the mesal horn apically not elongated in both) and an even distal edge (vs uneven distal edge in D. zimoveinaya , but straight (without recesses) distal edge covered with ribbs in D. dentifer sp. nov.), by having the distal part of the gonopod colpocoxite not flagelliform (vs flagelliform distal part of the gonopod colpocoxite in D. zimoveinaya but not flagelliform in D. dentifer sp. nov.) as well as by the relatively short distal segment of the posterior gonopod telopodite (vs elongate in D. zimoveinaya , of medium length in D. dentifer sp. nov.).

Description. Male (two fragments of the anterior body part). Length of these two fragments about 8–9 mm, width 1.5–1.7 mm with paraterga. Coloration in alcohol brown (discoloration during fixation is possible). Legs dark brown. Antennae dark brown. Eye patches black, with about 40 ocelli.

The exact number of body rings is unknown. There are 2 fragments (7 and 10 rings) of the front part; the posterior part is broken off and lost. Collum semicircular. Both collum and ring 2 narrower than head with genae. Ring 2 somewhat wider than collum. Paraterga beginning on ring 2–3, well developed on rings 5 and on the remaining rings. Anterolateral macrochaetae shortest, pointed, but not very sharply so. Caudolateral macrochaetae longest. Medial and caudolateral macrochaetae pointed. Axial suture poorly 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 a 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 midbody legs (including leg pairs 10 and 11) at base with a long setoid outgrowth ventrally but without additional claws dorsally.

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

Gonopods as in figs 3–7. Anterior gonopod telopodites flagelliform, covered with tiny spinules (at least basally) positioned on posterior surface of posterior gonopod colpocoxites inside a shallow, partly 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. Anterior angiocoxal process (ap, Fig. 5 ) long, flagelliform, its distal portion positioned inside frontal fold of colpocoxites. Posterior angiocoxal process (pp, Fig. 3 ) large, in the form of a thin, frontally curved plate with elongated mesal pointed horn (c, Fig. 7 ) apically. Posterior gonopod telopodite 2-segmented, setose; length of the distal segment is more short than average.

Female unknown.

Etymology. The species is named in honor of the collector P.V. Budilov, Russian entomologist. A noun in genitive.

Figures

FIGURES 3–7. Diplomaragna budilovi sp. nov., male holotype. 3, 7, gonopods, caudal view; 4, posterior angiocoxal processes and colpocoxites, caudal view; 5, gonopods, front view; 6, basal part of gonopods, caudal view; c, horn; pp, posterior angicoxal process; ap, anterior angiocoxal process; cx, coxosternum; at, anterior gonopod telopodite. Scales: 20 μm (Fig. 6), 100 μm (Figs 3–5), 0.5 mm (Fig. 7).