Ceratophysella

Nakamori, Taizo, 2013, A new species of Ceratophysella (Collembola: Hypogastruridae) from Japan, with notes on its DNA barcode and a key to Japanese species in the genus, Zootaxa 3641 (4), pp. 371-378 : 376-377

Key to the species of Japanese Ceratophysella

1 Postantennal organ with posterior lobes encircling an accessory boss........................................... 2

- Postantennal organ never with posterior lobes encircling an accessory boss...................................... 4

2 Head with 2 + 2 spines................................................................... C. horrida (Yosii)

- Head with 3 + 3 spines................................................................................ 3

3 Thoracic tergum I with 3 + 3 setae......................................................... C. comosa sp. nov.

- Thoracic tergum I with more than 3 + 3 setae.................................................. C. pilosa (Yosii)

4 Abdominal tergum IV with setae p1 subequal to setae p 2 in length........................... C. yakushimana (Yosii)

- Abdominal tergum IV with setae p1 longer or shorter than setae p2............................................. 5

5 Abdominal tergum IV with setae p1 longer than setae p2..................................................... 6

- Abdominal tergum IV with setae p1 shorter than setae p2................................................... 13

6 Abdominal tergum IV with setae p3 subequal to setae p2..................................................... 7

- Abdominal tergum IV with setae p3 longer than setae p2..................................................... 9

7 Tibiotarsi I–III with three clavate tenent hairs................................................... C. fujisana Itoh

- Tibiotarsi I–III with at most one clavate tenent hair......................................................... 8

8 Thoracic tergum I with 3 + 3 setae. Antennal segment I with seven setae. Claws without internal teeth... C. sakayori Tamura

- Thoracic tergum I with 2 + 2 setae. Antennal segment I with six setae. Claws with one internal tooth..... C. ateruii Tamura

9 Abdominal tergum V with medial spine-like integumentary projection between setae p1......... C. tergilobata Cassagnau

- Abdominal tergum V without this projection.............................................................. 10

10 Abdominal tergum V with setae p1 modified into a spine.................................... C. duplicispinosa Yosii

- Abdominal tergum V with setae p1 normal, not modified into a spine.......................................... 11

11 Head with setae oc2 and v2 modified into a spine.................................... C. wrayia (Uchida & Tamura)

- Head with setae oc2 and v2 hair-like, not modified into a spine............................................... 12

12 The tip of mucro pointed..................................................................... C. ainu Yosii

- Mucro blunt-tipped...................................................................... C. denisana Yosii

13 Dens with six setae.................................................................. C. proserpinae (Yosii)

- Dens with seven setae............................................................................... 14

14 Body granulation on abdominal tergum V fine: abdominal tergum V with more than 15 granules between setae p1............................................................................................ C. communis (Folsom)

- Body granulation on abdominal tergum V fine: abdominal tergum V with fewer than 15 granules between setae p1...... 15

15 Body colour white (alive) or straw-yellow (in alcohol)......................................... C. troglodites Yosii

- Body colour dark................................................................... C. denticulata Bagnall