Key to species of Attemsostreptus

1. Lateroapical metaplical process (lap) of gonopod coxa extremely long, bent in a U-shape (Figs 3B, 7A) ........................................................................................... A. reflexus Akkari & Enghoff, 2019

– Lateroapical metaplical process (lap) only moderately curved ........................................................ 2

2. Lateroapical metaplical process (lap) more than half as long as gonopod coxa, directed laterad or laterobasad ........................................................................................................................................ 3

– Lateroapical metaplical process (lap) less than half as long as gonopod coxa, directed pronouncedly basad ................................................................................................................................................. 4

3. Lateroapical metaplical process (lap) almost as long as coxal height; mesapical metaplical process (map) separated from rest of metaplica by rounded incision (Akkari & Enghoff 2019: fig. 1) ......... ................................................................................................................... A. costatus Verhoeff, 1941

– Lateroapical metaplical process (lap) only slightly longer than half coxal height; mesapical metaplical process (map) poorly delimited from rest of metaplica (Fig. 8D–E) ................................................. ............................................................................................................ A. cataractae Enghoff sp. nov.

4. Metazonites not carinate but striate as in species of Julidae (Fig. 9B); 58–62 podous rings; distomesal coxal spine (mcs) short, directed apicad (Fig. 11A, D) .................... A. julostriatus Enghoff sp. nov.

– Metazonites with typical trachystreptoform sculpture, i.e., carinate (Fig. 12D–F); 48 podous rings; distomesal coxal spine (mcs) long, directed distoapicad (Fig. 13C) .................................................. ............................................................................................................. A. leptoptilos Enghoff sp. nov.