Spinacopia

Chavtur, Vladimir G., 2016, Spinacopia dietkeyseri, a new species of Marine Ostracoda (Sarsiellidae: Myodocopina) from the Southern ocean, Zootaxa 4093 (3), pp. 391-406 : 404-405

Key to species of the genus Spinacopia

(modified after Kornicker 1969, 1975 and 1995)

1 Carapace longer than 2.50 mm ........................................................................... 2

- Carapace shorter than 2.50 mm ........................................................................... 3

2 Carapace with abundant short setules with parallel sides and pointed or digitated tips........................... S. octo

- Carapace without short setules with parallel-sides and pointed or digitated tips............................. S. menziesi

3 Carapace longer than 1.4 mm ............................................................................ 4

- Carapace shorter than 1.3 mm ........................................................................... 12

4 Carapace with series of lateral ridges and nodes..................................................... S. antarctica

- Carapace without lateral ridges and nodes.................................................................. 5

5 Carapace with numerous pits............................................................................ 6

- Carapace without pits.................................................................................. 8

6 Postero-dorsal bulge on carapace densely covered with spines................................... S. dietkeyseri , n. sp.

- Postero-dorsal bulge on carapace covered with setules or scattered spines and setules................................ 7

7 Carapace longer than 2.0 mm, 4+5 segments of 5th limb with 4-5 setae, 7th limb with 2+2 distal setae.............. S. mastix

- Carapace shorter than 2.0 mm, 4+5 segments of 5th limb with 6 setae, 7th limb with 3+3 distal setae............. S. sandersi

8 Carapace equal or longer than 2.0 mm..................................................................... 9

- Carapace shorter than 2.0 mm........................................................................... 10

9 Postero-dorsal bulge of carapace with ridge-like hirsute ventral margin, 1st endopodite segment of second antenna of female with 2 setae................................................................................... S. bisetula

- Postero-dorsal bulge of carapace without ridge-like hirsute ventral margin, 1st endopodite segment of second antenna of female with 3 setae..................................................................................... S. torus

10 Carapace longer than 1.7 mm and with abundant setae on lateral surface......................................... 11

- Carapace shorter than 1.6 mm and with sparse satae on lateral surface........................................ S. trox

11 Y-Sclerite without ventral branch..................................................................... S. rex

- Y-Sclerite with ventral branch................................................................... S. variabilis

12 Caudal process projecting posteriorly and valves with indistinct radial riblets................................ S. sandix

- Caudal process projecting posteriorly and valves without radial riblets........................................... 13

13 Lateral eyes absent.............................................................................. S. syrinx

- Lateral eyes present................................................................................... 14

14 First antenna without ventral spines on 2nd and 4th segments............................................... S. illex

- First antenna with ventral spines on 2nd and 4th segments.................................................. S. crux