Folsomia setifrontalis Potapov & Marusik, 1977

Potapov, Mikhail, Hasegawa, Motohiro, Kuznetsova, Natalia, Babenko, Anatoly & Kuprin, Alexander, 2018, Isotomidae of Japan and the Asiatic part of Russia. I. Folsomia ' inoculata' group, ZooKeys 750, pp. 1-40 : 15

Folsomia setifrontalis Potapov & Marusik, 1977

Material.

Far East of Russia, Primorsky Krai, Partizansky District, vicinities of Ekaterinovka, Chondalaz (=Lazovy) Range, oak litter, 26.ix.2004, coll. M. Potapov, L. Deharveng, R. Pomorski, and A. Bedos; Shkotovsky District, vicinities of Anisimovka and near trail to Khualaza Mount, forest litter, 10-12.ix.2001, coll. M. Potapov, Y. Bu and H. Cheng-Wang; Terneysky District, Sikhote-Alimski Reserve, Blagodatny station, oak wood on slope, rotten wood, 07.viii.2017, coll. N. Kuznetsova, A. Geras’kina, A. Kuprin.

Remarks.

Folsomia setifrontalis is sharply defined by the presence of anterior setae on ventral tube that is a unique character for the genus. Populations from Primorsky Krai differ from the type specimens (South Kuril Islands) by the presence of unpaired setae on manubrium and longer accp3-s on Abd.V. Considering this variability, a wider diagnosis is proposed for the species. So far, the chaetotaxy of ventral tube remain a key characteristic of this species.

Distribution and ecology.

Less common than the sympatric F. imparis sp. n. and F. macrochaetosa . Rare records in forest litter of southern part of Far East of Russia.