Ceratophysella Bӧrner, 1932

Salimi, Maryam, Shayanmehr, Masoumeh, Yoosefi Lafooraki, Elham, Mohammadi Sharif, Mahmoud & Arbea, Javier, 2025, A contribution to the knowledge of the genus Ceratophysella Bӧrner, 1932 (Collembola, Hypogastruridae) of Iran, Journal of Insect Biodiversity and Systematics 11 (2), pp. 351-361 : 356-357

Key to Iranian species of Ceratophysella Bӧrner, 1932

1 Abd. IV chaeta p1 longer than p2 (type B chaetotaxy) ( Fig. 3A). ..................................................................... 2

— Abd. IV chaeta p1 shorter than p2 (type A chaetotaxy) ( Figs 1B, 3D, 3E). ...................................................... 5

2 Body granulation rather fine: more than 16 granules between p1 chaetae on Abd. V. .................................. ........................................................................................................................................ C. armata (Nicolet, 1842)

— Body granulation rather coarse, especially on Abd. V-VI: 8-12 granules between p1 chaetae on Abd. V ( Fig. 3A). ................................................................................................................................................................... 3

3 Head with spine-like chaetae ( Fig. 3B). Abd. V with a strongly granulated hump between p1 chaetae ( Fig. 3C). ............................................................................................................ C. tuberculata Cassagnau, 1959

— Head without spine-like chaetae. Abd. V without such hump. ....................................................................... 4

4 Microchaetae p3 on Abd. IV absent; Claws with two lateral teeth. ................ C. borealis Martynova, 1977

— Microchaetae p3 on Abd. IV present ( Fig. 3A); Claws without lateral teeth. ... C. impedita Skarżyński, 2002

5 Abd. IV with 2+2 medial microchaetae. Abd. V with a strongly granulated, wart-like hump between the p1 chaetae ( Fig. 3D). .................................................................................................. C. gibbosa (Bagnall, 1940)

— Abd. IV with 3+3 medial microchaetae. Abd. V without such a wart-like hump ( Fig. 3E). ......................... 6 6 Abd. V with a semicircular hump between the p1 chaetae ( Fig. 3E). ............... C. stercoraria (Stach, 1963)

— Abd. V without such semicircular hump. ........................................................................................................... 7

7 Abd. V with 4+4 a-chaetae between the bases of p5 macrochaetae (chaeta a2’ present) ( Fig. 3F). ................ ................................................................................................................................. C. denticulata (Bagnall, 1941)

— Abd. V with 3+3 a-chaetae between the bases of p5 macrochaetae (chaeta a2’ absent) ( Fig. 1B). ............... 8

8 Ant. IV with simple apical bulb ( Fig. 4A). ........................................................................................................... 9

— Ant. IV with bilobed apical bulb ( Fig. 4B). ........................................................................................................ 10

9 Dens with 6 posterior thin chaetae ( Fig. 4C). ........................................................... C. succinea (Gisin, 1949)

— Dens with 7 posterior chaetae, the 2 internal thickened ( Fig. 4D). ................. C. engadinensis (Gisin, 1949)

10 Dens with 7 posterior thin chaetae ( Fig. 4E). Ant. IV with about 10 short, apically oblique sensory chaetae in ventral field ( Fig. 4B). ......................................................................... C. communis (Folsom, 1897)

— Dens with 7 posterior chaetae, the 4 internal thickened ( Fig. 4F). Ant. IV with 20–25 short, slightly recurved sensory chaetae in ventral field. ................................................................. C. alani ( Babenko, 1994)