Platytyphlops Stebbing 1912

Key to the species of Platytyphlops

1. Carapace with multiple ridges, not including marginal carina.................................................. 11

- Carapace without ridges except marginal carina, may have branchial swellings..................................... 2

2. Marginal carina serrate................................................................................. 4

- Marginal carina entire.................................................................................. 3

3. Uropod peduncle with 5 setae medially............................................................. P. cherkii

- Uropod peduncle with more than 10 setae medially................................................. P. orbicularis

4. Carapace covered with teeth, spines or tubercles, dorsal of marginal carina........................................ 5

- Carapace with few or no teeth, spines or tubercles............................................................ 8

5. Carapace covered with acute teeth or spines................................................................. 6

- Carapace covered with blunt tubercles..................................................................... 7

6. Carapace with acute teeth or spines dorsal of margin carina only. P5 minute, shorter than article 1 of antennule peduncle........................................................................................... P. echinatus n. sp.

- Carapace with acute teeth or spines ventral of marginal carina. P5 longer than article 1 of antennule peducle..................................................................................................... P. bamberi n. sp.

7. Antennule article 1 expanded as wing-like shape.................................................. P. tuberculatus

- Antennule article 1 normal, cylindrical shape................................................... P. petrescui n. sp.

8. Antennule accessory flagellum at least as long as main flagellum................................................ 9

- Antennule accessory flagellum shorter than main flagellum................................................... 10

9. Carapace as wide as long........................................................................ P. girardi

- Carapace distinctly longer than wide........................................................... P. semiornatus

10. Marginal carina teeth equal in size throughout.................................................. P. carpusserratus

- Marginal carina teeth decreasing in size posteriorly................................................. P. corolliferus

11. Uropod endopod article 1 twice the length of articles 2 and 3 together or more.................................... 12

- Uropod endopod article 1 less than twice the length of articles 2 and 3 together.................................... 15

12. Telson with 5 terminal setae............................................................................ 13

- Telson with 3 terminal setae............................................................................ 14

13. Uropod endopod article 1 with 28 or more setae.................................................. P. lowryi n. sp.

- Uropod endopod article 1 with 20 setae.......................................................... P. arafurensis

14. Submedian pair of ridges short, produced as blunt tooth............................................. P. peringueyi

- Submedian pair of ridges half length of carapace.................................................... P. grimaldii

15. Carapace with 1 ridge parallel to marginal carina, short submedian pair of ridges........................... P. ledoyeri

- Carapace with at least 3 pairs of ridges.................................................................... 16

16. Eye lobe with at least 2 lenses or tumidities................................................................ 17

- Eye lobe entirely without lens or tumidities................................................................ 19

17. Carapace ridges tall, narrow, with undulating hyaline margin.......................................... P. racovitzai

- Carapace ridges blunt................................................................................. 18

18. Carapace ridges with margins not undulate, pseudorostrum pointed...................................... P. mawsoni

- Carapace ridges incomplete, pseudorostrum excavate.................................................... P. latus

19. Central terminal seta on telson much shorter than outer pair terminal setae........................... P. taylorae n. sp.

- Terminal setae on telson equal.......................................................................... 20

20. Telson much shorter than uropod peduncles................................................................ 21

- Telson as long or longer than uropod peduncles....................................................... P. asperus

21. Ridge on the pseudorostrum........................................................................ P. rossi

- Pseudorostrum without ridges.................................................................... P. crosnieri