Pachyseius adeliensis Womersley, 1937 (Family?)

Pachyseius adeliensis Womersley, 1937: 18. Type locality: Antarctica.

Notes. This species shows some atypical characters for Pachylaelapidae, for example: (1) sternal shield with two pairs of setae (st1, st2); (2) a pair of free and well developed metasternal platelets, each bearing two setae (st3, st4); (3) basitarsus IV with very long sensory seta; (4) dorsal shield with several unpaired setae on medial surface. We are unable to place this species in any known family of Mesostigmata.