Paraxenylla

Queiroz, Gabriel C. & Deharveng, Louis, 2008, Description of a new species of Paraxenylla (Collembola, Hypogastruridae) from Brazil, with comments on the genus, Zootaxa 1858, pp. 1-8 : 6-7

Key to the species of the genus Paraxenylla

(after Palacios-Vargas & Janssens 2006, modified and completed)

1 Ventral tube with 1+1 chaetae......................................................................................................................2

- Ventral tube with more than 1+1 chaetae....................................................................................................6

2 Dens with 1+1 chaetae, tenaculum with 2+2 teeth .... P. cubana Palacios-Vargas & Janssens, 2006 ( Cuba)

- Dens with 2+2 chaetae, tenaculum with more than 2+2 teeth.....................................................................3

3 Tibiotarsus III with 5 clavate tenent hairs; unguis with inner tooth; mucro with internal lamella, separated from the dens; one lateral guard chaeta of Ant III located between the small internal rods ......................... ................................................................................................ P. affiniformis ( Stach, 1930) (cosmopolitan)

- Tibiotarsus III with less than 5 tenent hairs; unguis untoothed .................................................................. 4

4 Tibiotarsus III with 3 acuminate or slightly clavate tenent hairs; Abd II with 1+1 ventral chaetae.............. ............................................................................ P. lapazana Palacios-Vargas & Vázquez, 1988 ( Mexico)

- Tibiotarsus III with 4 tenent hairs................................................................................................................5

5 Tenent hairs of tibiotarsus III clavate; Abd II with 3+3 ventral chaetae; mucro without lamella and fused to the dens ............................................................... P. peruensis Palacios-Vargas & Janssens, 2006 ( Peru)

- Tenent hairs of tibiotarsus III acuminate; Abd II with 1+1 ventral chaetae; mucro with internal lamella, clearly separated from the dens ................................. P. piloua Thibaud & Weiner, 1997 ( New Caledonia)

6 Ventral tube with 2+2 chaetae; 3 tenent hairs on tibiotarsus III; one lateral guard chaeta of Ant III located between the small internal rods; mucro with internal lamella; maxilla very reduced, without lamella ....... ............................................................................................................... P. mangle Murphy, 1965 ( Gambia)

- Ventral tube with more than 2+2 chaetae....................................................................................................7

7 Ventral tube with 3+3 chaetae; apical bulb trilobed; mucro longer than dens; tenaculum with 4+4 teeth; unguis with inner tooth .......................................................... P. arenosa ( Uchida & Tamura, 1967) ( Japan)

- Ventral tube with 4+4 chaetae; tenaculum with 3+3 teeth...........................................................................8

8 Mucro separated from dens, 2–2.5 times shorter than dens; no tenent hairs on tibiotarsi; unguis with inner tooth; apical bulb simple ......................................................................... P. sooretamensis sp. nov. ( Brazil)

- Mucro fused to dens; 3 tenent hairs on tibiotarsus III; unguis without inner tooth....................................... .................................................................................................. P. oceanica ( Yosii, 1960) ( New Caledonia)