Altajosoma corniferum, Mikhaljova, Elena V., Nefediev, Pavel S. & Nefedieva, Julia S., 2008

Mikhaljova, Elena V., Nefediev, Pavel S. & Nefedieva, Julia S., 2008, A new species and new records of millipedes of the family Diplomaragnidae (Diplopoda, Chordeumatida) from Altai, Zootaxa 1931, pp. 49-56 : 49-51

Altajosoma corniferum sp.n.

Figs 1–3

Material examined: Holotype: 1 male ( IBSS), Russia, Republic of Altai, Ongudai District, Seminskii Pass, forest ( Pinus sibirica ), 1,800 m a.s.l., collected 15 August 2005 by A.S. Babenko.

Diagnosis: The species differs from congeners mainly by the large, horn-shaped lateral sheath processes of the posterior gonopod colpocoxites.

Description: Male. Length 17 mm, width 1.6 mm with paraterga. Coloration in alcohol light brown. Legs yellowish, with marbled brownish distal parts. Eyes black. Antennae broken.

Body with 32 segments. Anterior part of head sparsely setose, vertigial suture hardly visible. Eye patches subtriangular, with 23–27 ocelli. Collum semicircular, its macrochaetae broken. Somite 2 narrower than both head (with genae) and somite 3. Paraterga beginning on somite 2, well developed on somites 4–27, reduced on somite 28, onward missing. Metazonital macrochaetae in a transverse row on somites 29–31, like an extended triangle on preceding somites. Macrochaetae pointed, but not very sharply so. Anterolateral macrochaetae shortest, caudolateral and medial ones subequal in length. Axial suture well developed.

Legs long and slender. Leg pairs 1 and 2 typically reduced in size, with tarsal brushes as usual; each claw with long setiform outgrowth (=filament) ventrally at base, and two small additional claws dorsally. Other pregonopodal legs gradually enlarged toward gonopods. Leg pairs 3–7 with group of funnel-shaped tarsal papillae apically near claw. Claws 3 and 4 each with long setiform outgrowth ventrally and two small additional claws dorsally at base. Claws 5–7 each with a long setiform outgrowth at base ventrally only. Postgonopodal legs (including leg pairs 10 and 11) with funnel-shaped tarsal papillae apically near claw. Tarsal papillae gradually missing toward hind part of body. Claws of postgonopodal legs (including claws of leg pairs 10 and 11) each with a long setiform outgrowth ventrally and two small additional claws dorsally at base; long setiform outgrowth and additional claws gradually missing toward posteriormost legs (the additional claws missing former). Claws of posteriormost legs without both a long setiform outgrowth ventrally and two small additional claws dorsally. Legs pairs 10 and 11 with coxal glands. Coxa 11 ( Fig. 1 ) with ventral process covered with sparse setae; coxal gland opening on an anterior wall of coxa.

Anterior gonopod telopodites 2-segmented, subflagelliform ( Fig. 2 ); first telopodite segment and distal part of coxosternum attached to the adjacent mesal portion of posterior gonopod by thin membranous film. Distal part of telopodite hidden inside narrow sheath groove. Posterior gonopod colpocoxites fused basally, curved caudad. Sheath groove stretching to anterior surface of colpocoxite. Lateral sheath process of colpocoxite (lp) large, as horn curved basally, with small mesal protuberance subbasally; mesal surface of lateral sheath process shagreen. Mesal sheath process of colpocoxite absent. Angiocoxite with a globule in posterior view. Posterior angiocoxal process (pp) large, curved forward; its apex pointed. Anterior angiocoxal process (ap) digitiform, with a blunt apex ( Fig. 3 ). Posterior gonopod telopodites 2-segmented, setose, with a long femur.

Female. Unknown.

Etymology: The specific epithet refers to the horn-shaped lateral sheath processes of the posterior gonopod colpocoxites.

Figures

FIGURES 1 – 3. Altajosoma corniferum sp. n., male. 1, coxa of leg 11; 2, gonopods (caudal view); 3, gonopods (front view); lp, lateral sheath process of colpocoxite; pp, posterior angiocoxal process; ap, anterior angiocoxal process. Scale in mm.