Isotomodes species

Arbea, Javier I., 2006, The genus Isotomodes Linnaniemi, 1907 of the Ibero-balearic fauna, with description of two new species (Collembola: Entomobryomorpha: Isotomidae), Zootaxa 1351, pp. 45-52 : 50-51

Key of Isotomodes species in the Ibero-balearic fauna

The key presented here was compiled based on the work of Jordana and Arbea (1990), Simón et al. (1994) and Potapov (2001). A summary of the main diagnostic characteristics of the species is given in Table 1.

1 Abdominal segment V with a pair of dorsomedial macrosetae .................................... 2

- Abdominal segment V without dorsomedial macrosetae.............................................. 9

2 Dens with 1 anterior seta ................................................... I. productus (Axelson, 1906)

- Dens with 2 or more anterior setae ............................................................................... 3

3 Dens with 2 anterior setae ............................................................................................. 4

- Dens with 3 or more anterior setae................................................................................ 5

4 Ventral tube with 3+3 lateral setae. "Tenacular ridges" almost as long as dens.............. .............................................................................................. I. armatus Naglitsch, 1962

- Ventral tube with 4+4 lateral setae. "Tenacular ridges” half as long as dens.................. ............................................................................. I. subarmatus Jordana & Arbea, 1990

5 Dens with 3 anterior setae .................................................. I. martae Simón et al., 1994

- Dens with at least 4 anterior setae................................................................................. 6

6 Dens with 4 anterior setae .............................................. I. alavensis Simón et al., 1994

- Dens with at least 5 anterior setae................................................................................. 7

7 Dens with 5 anterior setae ............................................................................................. 8

- Dens with 6 anterior setae ..................................................... I. trisetosus (Denis, 1923)

8 Without seta p 12 on abdominal segment IV. Setae p 1 and p 3 on abdominal segment VI spine-like ......................................................................... I. sotoensis Simón et al., 1994

- With seta p 12 on abdominal segment IV. Setae p 1 and p 3 on abdominal segment VI not spine-like ............................................................................................. I. rafaeli sp. nov.

9 Dens with 2 anterior setae ........................................................................................... 10

- Dens with 3 or more anterior setae.............................................................................. 13

10 Abdominal segment V with 4+4 microsetae and 1+1 sensilla on dorsal side............. 11

- Abdominal segment V with 5+5 microsetae and 1+1 sensilla on dorsal side................. ............................................................................. I. gredensis Luciáñez & Simón, 1988

11 Ventral tube with 3+3 lateral setae .............................................................................. 12

- Ventral tube with 4+4 lateral setae. Setae p 1, p 3, p 4 on abdominal segment VI not spinelike ..................................................................................... I. bisetosus Cassagnau, 1959

12 Setae p 1, p 3, p 4 on abdominal segment VI spine-like I. ibanezi Simón & Luciáñez, 1990

- Setae p 1, p 3, p 4 on abdominal segment VI not spine-like ....................... I. rosae sp. nov.

13 Dens with 4 anterior setae ................................................. I. quadrisetosus Gama, 1963

- Dens with 6 anterior setae ....................................................... I. sexsetosus Gama, 1963