Caprellidae, Leach, 1814

Key to New Zealand species of the family Caprellidae View in CoL

1. Gills present on only pereonites 3 and 4................................................................... 2

- Gills present on pereonites 2–4......................................................................... 13

2. Pereopods 3–4 present (reduced)......................................................................... 3

- Pereopods 3–4 absent.................................................................................. 4

3. Pereonite 2 with two (paired) dorsal projections opposite gnathopod insertion, and one distally. Pereopods 3–4 uni-articulate............................................................ Pseudaeginella campbellensis Guerra-García, 2003 View in CoL

- Pereonite 2 with one low rounded projection distally, body smooth. Pereopods 3–4 bi-articulate... Noculacia anima sp. nov.

4. Pereopod 5 two-articulate....................................... Caprellaporema subantarctica Guerra-García, 2003 View in CoL

- Pereopod 5 six-articulate....................................................................... Caprella View in CoL , 5

5. Head with large acute, anterior pointing projection........................................................... 6

- Head without dorsal projection/with reduced subquadrate projection............................................. 8

6. Antenna 2 reaching well past peduncle of antenna 1. Male gnathopod 2 without anterodistal lobe...................... 7

- Antenna 2 shorter than or subequal to peduncle of antenna 1. Male gnathopod 2 with large rounded anterodistal lobe................................................................................ Caprella scauroides Mayer, 1903 View in CoL

7. Pereopods 6–7 merus longer than broad. Maxilliped dactylus serrate on both margins. Gnathopod 2 propodus slightly rugose....................................................................... Caprella novaezealandiae Kirk, 1879

- Pereopods 6–7 merus broader than long. Maxilliped dactylus both margins smooth. Gnathopod 2 propodus strongly rugose................................................................................. Caprella serenae sp. nov.

8. Pereonites 3–5 covered in projections and setae..................................... Caprella mutica Schurin, 1935 View in CoL

- Pereonites 3–5 smooth,?glabrous........................................................................ 9

9. Pereopods 5–7 propodus anterior palm convex............................................................. 10

- Pereopods 5–7 propodus anterior palm concave............................................................ 11

10. Ventral projection between gnathopods on pereonite 2. Gills ovoid............................................. 12

- Ventral projection absent....................................................... Caprella andreae Mayer, 1890 View in CoL

11. Gnathopod 1 merus subquadrate/truncated.................................. Caprella equilibra Say, 1818 View in CoL sensu lato

- Gnathopod 1 merus rounded................................................ Caprella manneringi McCain, 1979 View in CoL

12. Head with blunt projection. Gnathopod 1 merus posterior lobe subacute, narrow............... Caprella sarahae sp. nov.

- Head without projection. Gnathopod 1 merus posterior lobe broadly rounded.................. Caprella perplexa sp. nov.

13. Pereopods 3–4 present................................................. Pseudoprotomima hurleyi McCain, 1969 View in CoL

- Pereopods 3–4 absent................................................................................. 14

14. Pereopod 5 composed of two articles. Head with projection....................... Caprellinoides mayeri ( Pfeffer, 1888) View in CoL

- Pereopod 5 composed of three articles. Head without projection...................................... Caprellina View in CoL , 15

15. Maxilliped inner plate with two slightly serrate robust setae. Uropod 1 ramus longer than peduncle.................................................................................................... Caprellina judyae sp. nov.

- Maxilliped inner plate with three serrated robust setae. Uropod 1 ramus as long as or shorter than peduncle............. 16

16. Pereopods 6–7 distal articles narrow. Uropod 1 ramus shorter than peduncle. Uropods 1–2 only one margin serrate but only ⅔ of length of margin................................................ Caprellina longicollis Nicolet, 1849 View in CoL sensu lato

- Pereopods 6–7 distal articles broad. Uropod 1 ramus as long as peduncle. Uropods 1–2 both margins serrate............................................................................................ Caprellina plumea sp. nov.