Koreagna, Mikhaljova, Elena V. & Lim, Kil-Young, 2008

Mikhaljova, Elena V. & Lim, Kil-Young, 2008, The millipede family Diplomaragnidae Attems 1907 in the Korean Peninsula, with the descriptions of a new genus and new species (Diplopoda, Chordeumatida), Zootaxa 1925, pp. 51-61 : 52

Koreagna gen.n.

Type species: Koreagna obtecta sp. n.

Species included: Koreagna obtecta sp. n.

Diagnosis: The genus differs from other genera of the family mainly by the single, distally bifurcated, anterior angiocoxal process of the posterior gonopod placed inside the front fold of the colpocoxite, coupled with the absence of posterior angiocoxal processes and a low lateral sheath process of the colpocoxite.

The new genus seems more closely related to the Japanese genus Syntelopodeuma which was synonymyzed under Diplomaragna ( Shear 1990) but later was not revalidated, one of three species of Syntelopodeuma was transferred to founded Maritimosoma (Mikhaljova 2000) . The new genus resembles Syntelopodeuma in having the sole anterior angiocoxal process sheathed on the anterior face of the colpocoxite of the posterior gonopod, as well as in the absence of the posterior angiocoxal process and in having legs 3–7 like the postgonopodal legs. However, the new genus differs from it by the bifurcation of the distal part of the anterior angiocoxal process, the presence of the mesal sheath processes of the posterior gonopod colpocoxites fused medially and forming a single structure, the configuration of the male coxae 10 and 11, reduced paraterga (in contrast to pronounced paraterga in Syntelopodeuma ) and 29 body segments (in contrast to 32 body segments in Syntelopodeuma ).

Description: Body with 29 segments. Eyes present. Metazonites with poorly–developed dorsolateral bulges, which gradually grow lower toward hind part of body, each with usual 3+3 macrochaetae. Integument smooth. Gnathochilarium, collum, antennae as usual for the family.

Legs long and slender, in male with tarsal papillae on legs 3–7 and without tarsal papillae on postgonopodal legs. Each claw with two small claws dorsally and long, setiform outgrowth ventrally, excluding legs 3–7 in which each claw is supplied only with a long, ventral setiform outgrowth. Legs 3–7 not larger than other walking legs. Male legs 10 and 11 with coxal glands, both coxae 10 and 11 with a process.

Telopodite of anterior gonopod flagelliform, its distal part positioned inside elevated sheath. Coxosternum fastened to a lower point of an arch formed by basal part of anterior gonopod telopodite (as in genus Sakhalineuma ). Basal part of telopodite attached to adjacent mesal portion of posterior gonopod by thin membranous film. Colpocoxites of posterior gonopods fused medially. Posterior gonopod angiocoxite with one anterior process divided into two branches distally. Distal portion of anterior angiocoxal process placed inside front fold of colpocoxite. Posterior angiocoxal processes absent. Mesal sheath processes of posterior gonopod colpocoxites fused into single structure. Lateral sheath processes of colpocoxites low. Posterior gonopod telopodites 2–segmented, setose, femur of medium length.

Etymology: The generic name refers to Korea as the terra typica.

Distribution: South Korea.