Papillacarus

Ermilov, Sergey G., Anichkin, Alexander E. & Wu, Donghui, 2012, Two new species of the genus Papillacarus (Acari: Oribatida: Lohmanniidae) from caves of Southern Vietnam, Zootaxa 3593, pp. 75-88 : 86

Key to Vietnamese species of Papillacarus

1. Body surface with papillae (polygonal ornamentation present or absent).......................................... 2

- Body surface without papillae (polygonal ornamentation present or absent)...................................... 3

2. Dorsal side of body with polygonal ornamentation; prodorsal and lateral notogastral setae long, setiform, with short cilia; neotrichal setae setiform............................................................... P. aciculatus (Berlese)

- Dorsal side of body without polygonal ornamentation; prodorsal and lateral notogastral setae short, with long cilia; neotrichal setae multiply branched (stellate in dorsal view)............................................... P. hirsutus (Aoki)

3. Dorsal side of body with polygonal (foveolate or tuberculate) ornamentation...................................... 4

- Dorsal side of body without polygonal ornamentation....................................... P. undirostratus Aoki

4. Some prodorsal and notogastral setae with very long cilia.................................................... 5

- Prodorsal and notogastral setae setiform, with short cilia...................................................... 6

5. Dorsal side of body tuberculate; neotrichal setae multiply branched (stellate in dorsal view).... P. c o r n u t u s Sarkar & Subías

- Dorsal side of body foveolate; neotrichal setae setiform, with long cilia............................ P. ramosus Balogh

6. Number of neotrichal setae more than 20 pairs; notogastral setae c 1 short, considerably shorter than c 3.................. 7

- Number of neotrichal setae more than 80 pairs; notogastral setae c 1 long, slightly shorter than c 3..... P. polysetosus sp. nov.

7. Neotrichal setae of three types; notogastral setae c 2 short, considerably shorter than c 3... P. polygonatus Ermilov & Anichkin

- Neotrichal setae of two types; notogastral setae c 2 long, slightly shorter than c 3.................... P. indistinctus sp. nov.