Arrhopalitidae

Vargovitsh, Robert S., 2009, New Cave Arrhopalitidae (Collembola: Symphypleona) from the Crimea (Ukraine), Zootaxa 2047, pp. 1-47 : 44

Key to the species of the family Arrhopalitidae occurring in the caves of Crimea

1 Trichobothrial pattern caecus - type (ABC form about right angle). Tibiotarsi of foreleg and mid leg without secondary seta FS. Anterior side of dens with 3, 2, 1, 1, 1 thick setae .......................... 2––Genus Arrhopalites Börner, 1906

- Trichobothrial pattern pygmaeus - type (ABC form very obtuse angle). Tibiotarsi of foreleg and mid leg with secondary seta FSa. Anterior side of dens with 3, 2, 1, 1 simple setae ...................... 3––Genus Pygmarrhopalites gen. nov.

2 Five spiny or thickened setae on head. Antennae at least twice as long as head. Ant III not broadened. Ant IV with 15 whorls of setae. All claws slender; without tunica. Empodia not reaching tip of corresponding claw. Posterior dorsal setae of great abdomen longer than hind claw. Circumanal setae of Abd VI not broadened. Cuticular spines on female Abd VI absent ................................................................................................................... A. peculiaris sp. nov.

- 13 spiny setae on head. Antennae 1.5–1.8 times as long as head. Ant III generally swollen. Ant IV with 13 whorls of setae. Claws normal; at least claw of hind leg with tunica. Empodia exceeding tip of corresponding claw. Posterior dorsal setae of great abdomen shorter than hind claw. Circumanal setae of female Abd VI broadened. Cuticular spines on female Abd VI present .............................................................................................. A. karabiensis sp. nov.

3 Eight spiny setae on head. 2 + 2 thickened dorsal setae in anterior part of great abdomen. Ant IV of female with 5–6 (rarely 7) subsegments. Manubrium with 7 + 7 setae. Dens with 5 spines. Appendices anales palmated .................. 4

- No spiny setae on head. Anterior setae of great abdomen not thickened. Ant IV of female with 7 or more subsegments. Manubrium with 6 + 6 setae. Dens with 1 spine. Appendices anales rod-like, apically weakly denticulated ... ..................................................................................................................................................................................... 5

4 Tip of mucro narrow. Antennae of female 1.5–1.6 times as long as head. Posterior-external setae of dens basally thickened. Abd VI setae ms2, ms3, and as2 much shorter than axial seta ms1. Dens 1.3–1.5 times as long as mucro. .............................................................................................................................................. pseudoprincipalis sp. nov.

- Tip of mucro rounded or broadened. Antennae of female 1.9–2.1 times as long as head. Posterior-external setae of dens simple. Abd VI setae ms2, ms3, and as2 about as long as axial seta ms1. Dens 1.5–1.7 times as long as mucro ..................................................................................................................................... P. principalis skelicus ssp. nov.

5 Ant IV with 7 subsegments, without annulations between subsegments, with 13–14 whorls of setae. Claws normal. All empodia with small corner tooth. Dens setae Ii and IIpe thickened in basis, setae IIIpi and IVpi missing ............ .......................................................................................................................................................... P. ka pr u si sp. nov.

- Ant IV with 9–12 (rarely 8 or 13) subsegments, with distinct annulations between subsegments, with 15 (rarely 14 or 16) whorls of setae. Claws much elongated. All empodia without corner tooth. Dens setae Ii and IIpe simple, setae IIIpi and IVpi present ....................................................................................................................... P. tauricus sp. nov.