Cymadusa

Peart, Rachael A., 2007, A review of Australian Cymadusa (Crustacea: Amphipoda: Ampithoidae) with descriptions of eight new species, Zootaxa 1540, pp. 1-53 : 3-4

Key to world species of Cymadusa *

1 Antenna 1 accessory flagellum 1-articulate ............................................................................................... 2

- Antenna 1 accessory flagellum 2-articulate .............................................................................................. 17

2 Epimeron 3 posteroventral corner with an acute tooth ( Fig. 21 ) ............................................................... 3

- Epimeron 3 posteroventral corner not produced as a tooth ( Fig. 29 ) ........................................................ 6

3 Gnathopod 2 palm entire ( Fig. 35 ) ............................................................................... C. pemptos sp. nov.

- Gnathopod 2 palm excavate ( Fig. 17 ) ........................................................................................................ 4

4 Gnathopod 2 with strongly setose margins ( Fig. 26 ) ............................................... C. lunata Myers, 1985

- Gnathopod 2 with sparsely setose margins ( Fig. 23 ) ................................................................................. 5

5 Gnathopod 2 dactylus tapering evenly to an acute tip .................................. C. grossimana Ledoyer, 1984

- Gnathopod 2 dactylus blunt not tapering ............................................. C. cavimana ( Sivaprakasam, 1970)

6 Gnathopod 2 palm without midmedial tooth ( Fig. 31 ) .............................................................................. 7

- Gnathopod 2 palm with midmedial tooth ( Fig. 17 ) ................................................................................. 12

7 Gnathopod 1 palm with tooth defining palm ( Fig. 31 ) .............................................................................. 8

- Gnathopod 1 palm without tooth defining palm ( Fig. 39 ) ....................................................................... 11

8 Gnathopod 2 propodus produced to form distal lobe ( Fig. 35 ) .................................... C. thagaay sp. nov.

- Gnathopod 2 propodus not produced to form lobe ( Fig. 14 ) ..................................................................... 9

9 Uropod 3 outer ramus denticles present ................................................................... C. heronensis sp. nov.

- Uropod 3 outer ramus denticles absent .................................................................................................... 10

10 Uropod 3 outer ramus shorter than inner ramus .................................. C. bilobata pillipes ( Ledoyer, 1984)

- Uropod 3 outer ramus subequal in length to inner ramus ................................... C. bilobata ( Ruffo, 1969)

11 Gnathopod 2 with long plumose setae on margins ( Fig. 39 ) .......................................... C. wistari sp. nov.

- Gnathopod 2 with long simple setae on margins ( Fig. 6 ) ........................................... C. elegantis sp. nov.

12 Uropod 3 peduncle with marginal robust setae ( Fig. 18 ) ........................................................................ 13

- Uropod 3 peduncle without marginal robust setae ( Fig. 3 ) ..................................................................... 15

13 Gnathopod 2 palm entire ( Fig. 35 ) .......................................................................................................... 14

- Gnathopod 2 palm excavate ( Fig. 17 ) ........................................................................... C. jiigurru sp. nov.

14 Gnathopod 1 palm without midmedial tooth .......................................... C. imbroglio Rabindranath, 1972

- Gnathopod 1 palm with rounded midmedial tooth ............................................ C. chalongana Peart, 2002

15 Uropod 3 peduncle with greater than 5 distal robust setae ....................... C. munnu Poore & Lowry, 1997

- Uropod 3 peduncle with less than 5 distal robust setae ........................................................................... 16

16 Gnathopod 1 palm with small tooth defining palm ( Fig. 31 ) ................... C. mauritiensis ( Ledoyer, 1978)

- Gnathopod 1 palm without tooth defining palm ( Fig. 39 ) ................................. C. aungtonyae Peart, 2002

17 Epimeron 3 posteroventral corner with an acute tooth ( Fig. 21 ) ............................................................. 18

- Epimeron 3 posteroventral corner not produced as a tooth ( Fig. 29 ) ...................................................... 26

18 Gnathopod 2 with strongly setose margins ( Fig. 26 ) ............................................................................... 19

- Gnathopod 2 with sparsely setose margins ( Fig. 23 ) ............................................................................... 22

19 Gnathopod 2 propodus and carpus covered in dense, plumose setae ...................................................... 20

- Gnathopod carpus only covered with dense, plumose setae ................................. C. compta ( Smith, 1873)

20 Gnathopod 1 merus produced to form a long, acute anteroventral lobe; carpus elongated and narrow .. 21

- Gnathopod 1 merus produced to form a small, subacute or rounded anteroventral lobe; carpus short and robust .................................................................................................................... C. tattersalli Peart, 2004

21 Gnathopod 2 with midpalmar tooth present ....................................................... C. setosa ( Haswell, 1879)

- Gnathopod 2 with midpalmar tooth absent ............................................................. C. filosa Savigny, 1816

22 Gnathopod 2 palm with tooth defining palm ........................................................................................... 23

- Gnathopod 2 palm without tooth defining palm ...................................................................................... 24

23 Gnathopod 2 palm entire ( Fig. 35 ) ............................................................... C. crassicornis ( Costa, 1857)

- Gnathopod 2 palm excavate ( Fig. 17 ) ........................................................ C. oceanica J.L. Barnard, 1955

24 Gnathopod 2 dactylus overreaching palm .............................................................. C. ledoyeri Peart, 2004

- Gnathopod 2 dactylus shorter than or subequal to palm .......................................................................... 25

25 Gnathopod 1 merus produced to form a long, acute anteroventral lobe ....................................................... ............................................................................................................. C. hawaiensis ( Schellenberg, 1938)

- Gnathopod 1 merus produced to form a small, subacute or rounded anteroventral lobe ............................. ............................................................................................................................... C. vadosa Imbach, 1967

26 Uropod 3 peduncle with marginal robust setae ( Fig. 18 ) ........................................................................ 27

- Uropod 3 peduncle without marginal robust setae ( Fig. 3 ) ........................................... C. chuawe sp. nov.

27 Gnathopod 2 palm entire ( Fig. 35 ) .......................................................................................................... 28

- Gnathopod 2 palm excavate ( Fig. 17 ) ..................................................... C. brevidactyla ( Chevreux, 1907)

28 Gnathopod 2 with midpalmar tooth present .................................................................. C. tishana sp. nov.

- Gnathopod 2 with midpalmar tooth absent ................................................................ C. panwa Peart, 2002

Figures

FIGURE 3. Cymadusa chuawe sp. nov., holotype, female, WAM C 38528, 14 mm. Paratype, male, WAM C 38529, 11 mm, west side of Northwest Cape, Tantabiddi Beach, Western Australia.

FIGURE 6. Cymadusa elegantis sp. nov., holotype, female, AM P 51255, 13 mm. Paratype, male, AM P 51256, 14 mm, Fancy Point, Bruny Island, Tasmania, Australia.

FIGURE 14. Cymadusa imbroglio Rabindranath, 1972, male, AM P 51266, 14 mm, female, AM P 51265, 16 mm, Bare Island, Botany Bay, New South Wales, Australia. Scales 0.5 mm.

FIGURE 17. Cymadusa jiigurru sp. nov., holotype, male, AM P 61916, 7 mm. Paratype, female, AM P 61917, 7 mm. Lizard Island, Queensland, Australia. Scales 0.5 mm.

FIGURE 18. Cymadusa jiigurru sp. nov., holotype, male, AM P 61916, 7 mm. Lizard Island, Queensland, Australia. Scales 0.5 mm for pereopods 3 – 7 and 0.2 mm for uropods 1 – 3 and telson.

FIGURE 21. Cymadusa pemptos sp. nov., holotype, male, AM P 61924, 7 mm. Paratype, female, AM P 61925, 8 mm. Fifth Creek, Spencer Gulf, Port Pirie, South Australia, Australia.

FIGURE 23. Cymadusa pemptos sp. nov., holotype, male, AM P 61924, 7 mm. Paratype, female, AM P 61925, 8 mm. Fifth Creek, Spencer Gulf, Port Pirie, South Australia, Australia. Scales 0.5 mm. Pereopods 5 – 7 are missing.

FIGURE 26. Cymadusa setosa (Haswell, 1879). Neotype, male, 10.5 mm, AM P 10853. Female, 11 mm, AM P 10854, Kurnell, Botany Bay, New South Wales, Australia. Scales 0.5 mm.

FIGURE 29. Cymadusa thagaay sp. nov., holotype, male, AM P 62518, 4 mm. Paratype, female, AM P 62519, 4 mm. Lizard Island, Queensland, Australia.

FIGURE 31. Cymadusa thagaay sp. nov., holotype, male, AM P 62518, 4 mm. Paratype, female, AM P 62519, 4 mm. Lizard Island, Queensland, Australia. Scales 0.2 mm.

FIGURE 35. Cymadusa tishana sp. nov., holotype, male, WAM C 38531, 7 mm. Paratype, female, WAM C 38531, 7 mm. Tish Point, Rosemary Island, Dampier Archipelago, Western Australia, Australia. Scales 0.5 mm.

FIGURE 39. Cymadusa wistari sp. nov., holotype, male, AM P 62534, 6 mm. Paratype, female, AM P 62535, 6 mm. Heron Island, Queensland, Australia. Scales 0.5 mm.