Anurida hammerae, Christiansen, 1952

Babenko, Anatoly & Nakamori, Taizo, 2021, A new Anurida species of the hammerae-group from the Russian Far East (Collembola, Neanuridae), Zootaxa 4995 (2), pp. 367-374 : 372-373

Key to the known species of the hammerae -group

1 Dorsal side of Abd.4 with 2+2 axial setae.................................................................. 2

- All terga from Th.2 to Abd.4 with at least 3+3 axial setae...................................................... 7

2 Dorsal side of Th.2–3 with 3+3 axial setae................................................................. 3

- Dorsal side of Th.2–3 with 2+2 axial setae, if 3+3, than 7+7(8) ocelli present...................................... 4

3 3+3 ocelli; all terga from Th.2 to Abd.3 with 3+3 axial setae.... A. vulcanica Fjellberg, 1985 [Nearctic: USA, Washington]

- 5+5 ocelli, dorsal side of Abd.1–3 with 2+2 axial setae............ A. beringi Fjellberg, 1985 [East Palaearctic—Nearctic]

4. 7+7(8) pigmented ocelli present.......................................................................... 5

- A lesser number of ocelli............................................................................... 6

5. Th.1 with 3+3 dorsal setae, mandibles with 3+2 teeth..................................................................................... A. elegans Babenko, Shveenkova & Kuznetsova, 2019 [East Palaearctic: Russian Far East]

- Th.1 with 2 macrosetae and 3–4 microsetae on each side, mandibles with 3+3 teeth..................................................................................... A. luciae Fjellberg, 1985 [North-East Palaearctic: Chukotka]

6 Usually with 3+3 (whole range 2–4) colourless ocelli..................... A. narli Fjellberg, 1985 [Chukotka — Alaska]

- Ocelli absent.................................................................... A. reducta Fjellberg, 1985

7 Ocelli present, colourless............................................................................... 8

- Ocelli absent............................................. A. okamotoi Yosii, 1970 [East Palaearctic: Japan, cave]

8 5+5 ocelli, setae p2 and p3 on Th.2–3 anteriorly to p1–p4 line.................................................. 9

- 3+3 ocelli, setae p3 on Th.2–3 at level with p 4................... A. trioculata Kinoshita, 1916 [East Palaearctic: Japan]

9 Ant.4 with many additional blunt sensilla; Th.1 with more than one row of setae...................................................................................... A. hammerae Christiansen, 1952 [East Palaearctic—Nearctic]

- Ant.4 with only 6 sensilla; Th.1 with usual number of 3+3 setae set in line................................................................................................ A. hirsuta sp. nov. [East Palaearctic: Russian Far East]