Alineuma rodionovi, 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 : 4-5

Alineuma rodionovi sp. nov.

Figs 1–2

Material examined. Holotype: male ( FSCB), Russia, Primorsky Krai, Shkotovsky District, 8 km SSE of Anisimovka village, Sikhote-Alin mountain system, Mt. Litovka , ca 200 m a.s.l., mixed forest, 15.X.2006, leg. A. A. Rodionov . Paratype: 1 female ( FSCB), same locality as in holotype, 15.X.2006, leg. A. A. Rodionov .

Description. Male. Length about 10.0 mm, width about 1.0 mm with paraterga. Coloration in alcohol light beige (discoloration in alcohol is possible). Antennae light brownish. Eye patches black, with about 20 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 somites 29–31, like an extended triangle on preceding somites. Anterolateral macrochaetae shortest, caudolateral and medial ones subequal in length. Macrochaetae of front body part pointed, ones of caudal body part pointed, but not very sharply so. Anterolateral macrochaetae of caudal body part clavate. Axial suture relatively well-developed.

Legs long and slender. Leg pairs 1 and 2 typically reduced in size. Other pregonopodal legs somewhat 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. Claw of legs 10 and 11 at base with a long setoid outgrowth ventrally and two small additional claws dorsally. Tarsi 10 and 11 without papillae. Other postgonopodal legs without tarsal papillae. Claw of midbody legs at base with two small additional claws dorsally and a long setoid outgrowth ventrally. Claw of hindmost legs at base with a long setoid outgrowth ventrally only.

Legs 10 and 11 with coxal glands. Coxae 10 with small knob. Trochanter 10 without modifications. Coxae 11 without modifications. Trochanter 11 with a small caudoventral, setose, knob-shaped outgrowth.

Gonopods as in figs 1–2. Anterior gonopod telopodites (at, Fig. 2 ) thick, subflagelliform, curved, 1-segmented, not sheathed; 2/3 their distal length covered with setae or spinules. Posterior gonopods with the mesal sheath processes transformed into a very high trapezoidal structure (ms, Fig. 2 ), strongly curved forward; basal part of ms laterally with a field of large spikes. Hyaline fimbriate branches (b, Fig. 2 ) are located between this trapezoidal structure and colpocoxites. Colpocoxites fused mediobasally by ms. Each colpocoxite entire. Posterior gonopod angiocoxites with subglobule (sg, Fig. 2 ) in posterior view and depressed centrally in anterior view. Anterior angiocoxal processes (ap, Fig. 1 ) very large, broad with fimbriate apices, their distal parts hidden by a colpocoxital fold. Posterior angiocoxal processes (pp, Fig. 2 ) large and long, curved apically, their mesal side covered with papillae. Posterior gonopod telopodites 2-segmented, setose, prefemur with a thin stem, femur small.

Female. Length about 10.0 mm, width about 1.0 mm with paraterga. Body with 32 rings. Macrochaetae slenderer and more pointed than in male. Vulvae not dissected.

Etymology. The species is named in honor of the collector A. A. Rodionov , Russian naturalist. A noun in genitive.

Figures

FIGURES 1–2. Alineuma rodionovi sp. nov., male holotype. 1, gonopods, front view; 2, gonopods, caudal view, right femur of posterior gonopod telopodite is twisted; ms, trapezoidal structure; b, hyaline fimbriate branch; ap, anterior angiocoxal process; pp, posterior angiocoxal process; at, anterior gonopod telopodite; sg, subglobule of posterior angiocoxite. Scale in mm.