Parabelbella, Bulanova-Zachvatkina, 1967

Ermilov, Sergey G. & Ryabinin, Nikolay A., 2020, Сontribution to the knowledge of Parabelbella (Acari, Oribatida, Damaeidae): description of two new species from Russia and the U. S. A., redescription of P. inaequipes (Banks, 1947) and a key to known species, Zootaxa 4860 (3), pp. 352-374 : 372-373

Key to known species of Parabelbella

1. Prodorsobasal tubercle Ba not developed.................................................................. (2)

- Prodorsobasal tubercle Ba developed..................................................................... (3)

2. Notogastral setae la and lm with distinct barbs; distance of setae lm–lp clearly longer than that of la–lm and lp–h 3; anterior median ventral tubercle developed; body size: 381–415 232–249................................................................................................... Parabelbella pseudoinaequipes sp. nov. Distribution: U.S.A.

- Notogastral setae la and lm roughened, without barbs; distance of setae lm–lp little longer than that of la–lm and lp–h 3; anterior median ventral tubercle not developed; body size: 381–415 × 232–249............................................................................................... Parabelbella inaequipes ( Banks, 1947) . Distribution: U.S.A.

3. Prodorsobasal tubercles Da and Bp developed............................................................. (4)

- Prodorsobasal tubercles Da and Bp not developed.......................................................... (5)

4. Prodorsobasal tubercle Dp developed; notogastral seta p 1 very long (longer than the other notogastral setae), flagellate; body size: 500–539 352–392............. Parabelbella flagellata ( Balogh &Mahunka, 1969) . Distribution: Neotropical region.

- Prodorsobasal tubercle Dp not developed; notogastral seta p 1 comparatively short (not longer than the other notogastral setae), setifrom; body size: 482–521 308–357................... Parabelbella meridiana (Norton, 1979(a )). Distribution: Chile.

5. Propodolateral apophysis not developed................................................................. (6)

- Propodolateral apophysis developed.................................................................... (7)

6. All notogastral setae with flagellate tip; notogastral setae c 1 directed anteriad; epimeral tubercles E2a and E2p developed; body size: 566–626 × 339–400........ Parabelbella golosovae (Lyaschev & Tolstikov, 1993) . Distribution: central western Asia.

- All notogastral setae without flagellate tip; notogastral setae c 1 directed posterolaterad; epimeral tubercles E2a and E2p not developed; body size: 348–398 × 215–249........... Parabelbella rusfareastensis sp. nov. Distribution: Russian Far East.

7. All notogastral setae with flagellate tip; tectum of podocephalic fossa with long, triangular tooth projecting posterolaterad, reaching propodolateral apophysis; body size: 348–381 × 232–265.................................................... Parabelbella elisabethae ( Bulanova-Zachvatkina, 1967) (see also Miko et al. 2011). Distribution: Palaearctic region.

- All notogastral setae without flagellate tip; tectum of podocephalic fossa not developed........................... (8)

8. Interlamellar seta with flagellate tip; all dorsal notogastral setae smooth; mutual distance between setae c 1 – c 1 shorter than that of c 1 – c 2; propodolateral apophysis of medium size, erect; body size: 531–611 × 346–422...................................................... Parabelbella longiseta ( Banks, 1906) (see also Norton 1979 b). Distribution: Nearctic region.

- Interlamellar seta without flagellate tip; all dorsal notogastral setae barbed; mutual distance between setae c 1 – c 1 about the same as c 1 – c 2; propodolateral apophysis of small, perpendicular; body size: 640 400............................................ Parabelbella crenatosetosa Bulanova-Zachvatkina, 1967 . Distribution: central part of the eastern Palaearctic region.