Iphinoe Bate, 1856

Mazziotti, Cristina & Lezzi, Marco, 2020, The cumacean genus Iphinoe (Crustacea: Peracarida) from Italian waters and I. daphne n. sp. from the northwestern Adriatic Sea, Mediterranean, Zootaxa 4766 (2), pp. 331-357 : 335

Genus Iphinoe Bate, 1856

In order to facilitate identification (mainly of adult specimens), a dichotomous key of the Atlanto-Mediterranean Iphinoe species is provided here. When the sex is not stated, the feature described applies to females and males. Finally, the diagnostic characters are written in bold.

IPHINOE species key from atlanto-mediterranean waters

1. Pleonite 6 with 2 perianal setae ......................................................................... 2

- Pleonite 6 with more than 2 perianal setae ................................................................ 21

2. Antenna 1 with 2 aesthetascs ............................................................................ 3

- Antenna 1 with 1 aesthetasc ............................................................................ 4

3. CL/CD: 2.4; dorsal carina armed, basis length of pereopod 1 subequal to the other joints together, seta formula 11; 5+ 11 in females.................................................................... I. rhodaniensis Ledoyer, 1965

- CL/CD: 1.5; dorsal carina unarmed in adult males; pseudorostrum slightly upturned, with some distal hairs............................................................................................... I. crassipes Hansen, 1895

4. Females available..................................................................................... 5

- Males available...................................................................................... 12

5. Pseudorostrum bifid and long .................................................... I. acutirostris Ledoyer, 1965

- Pseudorostrum rounded................................................................................ 6

6. Uropod peduncle with ≥ 10 acuminate setae ............................................................... 7

- Setae of uropod peduncle <10 acuminate setae .......................................................... 10

7. Pereopod 1, basis subequal to the other joints together, seta formula 10–12; 4–5+12 .......... I. douniae Ledoyer, 1965

- Pereopod 1 basis length different from rest of pereopod 1 ................................................... 8

8. Pereopod 1 basis longer than the other joints together........................................................ 9

- Pereopod 1 basis shorter than the other joints together, seta formula 12; 4+12 .................. I. armata Ledoyer, 1965

9. Uropod seta formula 10; 5+15 ............................................... Iphinoe trispinosa ( Goodsir, 1843)

- Uropod seta formula 12; 4+9 ................................................................ I. daphne n. sp.

10. Pereopod 1 basis shorter than the other joints together...................................................... 11

- Pereopod 1 basis longer than the other joints .............................................. I. inermis Sars, 1878

11. Uropod seta formula 8; 4+8........................................ I. canariensis Corbera, Brito and Nunez, 2002

- Uropod seta formula 7–9; 4–7+12 ................................................... I. maculata Ledoyer, 1965

12. Pseudorostrum bifid, long, carina armed............................................ I. acutirostris Ledoyer, 1965

- Pseudorostrum rounded .............................................................................. 13

13. Antenna 2 not reaching the end of the pleon .............................................. I. inermis Sars, 1878

- Antenna 2 reaching the end of the pleon ................................................................ 14

14. P2 carpus with plumose setae .......................................................................... 15

- P2 carpus without plumose setae ........................................................................ 17

15. P2 carpus with 3 plumose setae, sternal process with 6 digits .............................. I. douniae Ledoyer, 1965

- P2 carpus with less than 3 plumose setae ................................................................. 16

16. P2 carpus with 2 plumose setae, sternal process with 6/8 digits ............................. I. armata Ledoyer, 1965

- P2 carpus with 1 plumose seta, sternal process bifid ............................................. I. daphne n. sp.

17. Uropod peduncle with serrulate setae distally on inner margin, CL/CD=2, sternal process with 6–8 digits ........................................................................................... I. trispinosa ( Goodsir, 1843)

- Uropod peduncle without serrulate setae distally on the inner margin.......................................... 18

18. Sternal process with 4 cup-like digits, CL/CD=1.96.................................... I. maculata Ledoyer 1965

- Sternal process with 8 teeth, CL/CD=2.3............................. I. canariensis Corbera, Brito and Nunez, 2002

19. Pleonite 6 with 4 perianal setae ........................................................................ 20

- Pleonite 6 with 6 perianal setae, 1 aesthetasc on antennal ..................................... I. tenella Sars, 1878

20. Antenna 1 with 1 aesthetasc ........................................................... I. elisae Bâcescu, 1950

- Antenna 1 with 2 aesthetascs, CL/CD=2.3.............................................. I. serrata Normann, 1867