Prionospio ( Minuspio )

Key to the species of the subgenus Prionospio ( Minuspio) View in CoL

1. With three or four pairs of branchiae...................................................................... 2

- With more than four pairs of branchiae..................................................................... 6

2. Branchiae present from chaetiger 3..................................... Prionospio ( Minuspio) pilkena Wilson, 1990 View in CoL

- Branchiae present from chaetiger 2........................................................................ 3

3. With dorsal flaps on chaetigers 5–13............................................ P. ( M.) laciniosa Maciolek, 1985 View in CoL

- Without a dorsal flap................................................................................... 4

4. Some branchia distinctly wrinkled.............................................. P. ( M.) fauchaldi Maciolek, 1985 View in CoL

- All branchiae smooth, not wrinkled...................................................................... 5

5. With dorsal crests........................................................... P. ( M.) elegantula Imajima, 1990 View in CoL

- Without dorsal crests............................................................ P. ( M.) japonica Okuda, 1935 View in CoL

6. 39 pairs of branchiae....................................................... P. ( M.) polybranchiata Fauvel, 1929 View in CoL

- Fewer than 39 pairs of branchiae......................................................................... 7

7. Interparapodial pouches present.................................................... P. ( M.) aluta Maciolek, 1985 View in CoL

- Interparapodial pouches absent........................................................................... 8

8. Ventral sabre chaeta absent.................................................... P. ( M.) perkinsi Maciolek, 1985 View in CoL

– Ventral sabre chaeta present............................................................................. 9

9. Some branchia distinctly longer than (minimally 4–5 times) notopodial lamellae................................... 10

- All branchiae short, nearly as long as notopodial lamellae..................................................... 15

10. Prostomium with peaks............................................................................... 11

- Prostomium without peaks............................................................................. 14

11. Anterior part of prostomium truncated, with a small medial peak.......................... P. ( M.) delta Hartman, 1965 View in CoL

- Anterior part of prostomium rounded, with 3–5 peaks....................................................... 12

12. Eyes absent...................................................................... P. ( M.) anatolica View in CoL sp. nov.

- Two pairs of eyes.................................................................................... 13

13. Dorsal crests absent............................................................. P. ( M.) lighti Maciolek, 1985 View in CoL

- Dorsal crests present........................................................... P. ( M.) pulchra Imajima, 1990 View in CoL

14. Branchiae longest on chaetiger 2, prostomium widest at mid–point......................... P. ( M.) tatura Wilson, 1990 View in CoL

- Branchiae longest on chaetigers 4–5, prostomium widest at posterior most region.............. P. ( M.) yuriel Wilson, 1990 View in CoL

15. Notopodial lamellae lacking on chaetiger 1................................................................ 16

- Notopodial lamellae more or less well–developed on chaetiger 1............................................... 19

16. Dorsal crests absent......................................................... P. ( M.) patagonica Augener, 1923 View in CoL

- Dorsal crests present................................................................................. 17

17. Without prostomial peaks......................................................... P. ( M.) maciolekae View in CoL sp. nov.

- With prostomial peaks................................................................................. 18

18. Anterior margin of prostomium truncated and with only a small peak..................... P. ( M.) wireni Maciolek, 1985 View in CoL

- Anterior margin of prostomium rounded and with five small peaks............... P. ( M.) multibranchiata Berkeley, 1927 View in CoL

19. More than 10 pairs of branchiae........................................................................ 20

- Fewer than 10 pairs of branchiae....................................................................... 21

20. Dorsal crests absent.............................................................. P. ( M.) wambri Wilson, 1990

- Dorsal crests present.......................................................... P. ( M.) elongata Imajima, 1990 View in CoL

21. Eyes absent, branchiae wrinkled................................................ P. ( M.) sandersi Maciolek, 1981b View in CoL

- One or two pairs eyes present, branchiae narrow and cylindrical.......................... P. ( M.) cirrifera Wirén, 1883 View in CoL