Cosmolaelaps sejongi Keum, Jung and Joharchi

Joharchi, Omid, Döker, Ismail & Khaustov, Vladimir A., 2022, New species and new records of Cosmolaelaps Berlese (Acari: Laelapidae) from Russia, with a review of the Russian species of the genus, Zootaxa 5133 (4), pp. 486-508 : 501-503

Cosmolaelaps sejongi Keum, Jung and Joharchi

Cosmolaelaps sejongi Keum, Jung and Joharchi, 2017: 487 .

( Figures 45–49 )

Specimens examined. Six females, Sakhalin Island, Russia, 46°44'06"N 142°12'17.5"E, 11 August 2021, O. Joharchi coll., in the nest of Lasius umbratus (Nylander) ( Hymenoptera : Formicidae ) (in TUMZ).

Remarks. Cosmolaelaps sejongi was described from Republic of Korea ( Keum et al., 2017). It has been found from soil around roots of an oak tree ( Keum et al., 2017), and is now recorded in Russia for the first time, in the nest of L. umbratus . Our specimens agree well with the description given by Keum et al. (2017). The species is easily recognised by the distinctive shape of the post-anal seta (thickened, sparsely barbed and apically hook shaped), which is inserted on a small tubercle ( Figs 46, 49 ); dorsal shield setae thick and long, most setae long enough to reach well past the base of next posterior seta, and Z5 sparsely barbed, longer and thicker than J5 ( Figs 45, 47 ); sternal setae short, not reaching base of following setae ( Figs 46, 48 ); soft opisthogastric cuticle bearing 16 pairs setae, Jv5 well thickened, apically hook shaped and subequal in length with post-anal seta ( Figs 46, 49 ).

Figures

FIGURES 45–49. DIC micrographs of Cosmolaelaps sejongi Keum, Jung and Joharchi, female. 45, idiosoma in dorsal view; 46, idiosoma in ventral view; 47, general view of some opisthonotal setae; 48, sternal and genital shields; 49, general view of opisthogastric area.