Key to the species of Alamprops

1. Telson with 3 terminal setae..................................................................... A. kensleyi - Telson with 5 terminal setae............................................................................. 2 2. Telson without lateral setae.............................................................................. 3 - Telson with lateral setae............................................................................... 11 3. Carapace with lateral ridges............................................................................. 4 - Carapace without ridges................................................................................ 6 4. Carapace with 1 lateral ridge................................................................... A. lomakinae - Carapace with 2 or more lateral ridges..................................................................... 5 5. Carapace with 3 lateral ridges................................................................. A. pseudosarsi - Carapace with 2 lateral ridges.................................................................. A. triserratus 6. Telson with equal terminal setae.......................................................................... 7 - Telson with unequal terminal setae........................................................................ 8 7. Lateral margins of telson serrate.................................................................. A. comatus - Lateral margins of telson entire................................................................... A. tomalesi

8. Outermost pair of terminal setae on telson longest............................................................ 9

- Central seta of terminal seta on telson longest.............................................................. 10

9. Uropod peduncle with 5 or fewer medial setae......................................................... A. flavus

- Uropod peduncle with 8 or more medial setae..................................................... A. obfuscatus

10. Pereonite 2 concave dorsally. Uropod peduncle with 17 or more setae medially; endopod article 3 with medial setae................................................................................................. A. donghaensis

- Pereonite 2 convex dorsally. Uropod peduncle with 11 setae medially; endopod article 3 without medial setae... A. carinatus

11. Carapace without lateral ridges.......................................................................... 12

- Carapace with lateral ridges............................................................................ 14

12. Telson terminal setae equal in length................................................................ A. affinis

- Telson terminal setae unequal in length................................................................... 13

13. Uropod exopod article 1 equal to article 2......................................................... A. profundus

- Uropod exopod article 1 shorter than article 2....................................................... A. serratus

14. Carapace with 1 lateral ridge....................................................................... A. tenuis

- Carapace with multiple lateral ridges..................................................................... 15

15. Outermost pair of terminal setae on telson longest................................................. A. longispinus

- Central seta equal to or longer than outermost pair of terminal setae on telson..................................... 16

16. Uropod exopod article 1 subequal to article 2.................................................. A. krasheninnikovi

- Uropod exopod article 1 shorter than article 2.............................................................. 17

17. Carapace with more than 4 lateral ridges, including partial ridges................................... A. multifasciatus

- Carapace with 4 lateral ridges........................................................................... 18

18. Eyelobe extending to anterior border of pseudorostrum........................................... A. quadriplicatus

- Eyelobe not extending to anterior border of pseudorostrum........................................ A. augustinensis