Scleroconcha

Key to species of the genus Scleroconcha

(only species south of 35°S included)

For adult females (also for male A-1 of S. frons; unknown for S. sculpta)

1 Length of carapace shorter than 2.5 mm.................................................................... 2

- Length of carapace longer than 2.5 mm.................................................................... 4

2 Carapace with lateral ribs............................................................................... 3

- Carapace without lateral ribs....................................................................... S. wolffi

3 Second endopodial joint of antenna short, 7th limb without peg on opposite comb............................... S. pix

- Second endopodial joint of antenna long, 7th limb with peg on opposite comb................................ S. flexilis

4 Rostrum on valves of carapace with ventral horn............................................................. 5

- Rostrum on valves of carapace without ventral horn.......................................................... 6

5 Terminal comb of 7th limb has 8 teeth with long marginal spines, caudal furca with 15+15 claws.................. S. solox

- Terminal comb of 7th limb has 15–17 teeth with long marginal spines, caudal furca with 13+13 (14) claws........ S. arcuata

6 Terminal comb of 7th limb has bare teeth or pegs, base of Bellonci organ segmented................................. 7

- Terminal comb of 7th limb has alate teeth with short spines, base of Bellonci organ unsegmented....................... 8

7 Medial eye with 3 tubercles............................................................ S. tuberculata sp. nov.

- Medial eye bare.............................................................................. S. gallardoi

8 Carapace elongated, with thin ribs................................................................ S. edentata

- Carapace short, with thick ribs.................................................................. S. appelloefi