Eueremaeus trionus (Higgins, 1979)

Ermilov, S. G. & Ryabinin, N. A., 2020, A NEW SPECIES OF THE GENUS EUEREMAEUS MIHELČIČ, 1963 (ACARI: ORIBATIDA: EREMAEIDAE) FROM THE RUSSIAN FAR EAST, Far Eastern Entomologist 409, pp. 14-20 : 19-20

Key to species of trionus -group of Eueremaeus

1. Bothridial setae short, with globular head; prodorsal enantiophyses and lateral transverse carinae present; costulae long, reaching insertions of lamellar setae; body size: 713–796 × 398–464 [Palaearctic Region: Russian Far East] ....... Eueremaeus badzhalensis sp. n.

– Bothridial setae long, with clavate head; prodorsal enantiophyses and lateral carinae absent; costulae of medium size, not reaching insertions of lamellar setae, or absent ................. 2

2. Body foveolate; costulae completely absent; anal and adanal setae of medium length; body size: 467–510 × 230 [Nearctic Region; Palaearctic Region: northwest of Siberia ............. ................................................................................ Eueremaeus trionus (Higgins, 1979)

– Body not foveolate; costulae present; anal and adanal setae short; body size: 442–586 × 200–329 [East part of the Palaearctic Region] .................................................................. .......................................................................... Eueremaeus elongatus (Fujikawa, 1972)