SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 543 ...

NUMBER 543 65
9. Rostrum elongate, subequal to carapace length, dorsal teeth obsolescent; cornea of
eye ogival Carinopontonia
(Northwest Shelf of Australia; 83 m)
Rostrum generally shorter than carapace length, dorsally dentate; cornea generally
globular (except occasionally in Periclimenes 10
10. Second pereopods very dissimilar, 3rd pereopod with conspicuous, hoof-shaped
protuberance on dactyl *Jocaste
Second pereopods similar, even if unequal; 3rd pereopod without protuberance on
dactyl unless concealed by flexion into propodal slot 11
11. Carapace either strongly depressed or with sinuous, lobate, or grossly dentate dorsal
profile, especially in males 12
Carapace somewhat compressed laterally, dorsal profile not very uneven ... 13
12. Rostrum unarmed ventrally; carapace not unusually depressed, dorsal profile
sinuous, lobate, or dentate, especially in males; 3rd pereopod with dactyl neither
twisted nor with carinate margins Dasycaris
Rostrum dentate ventrally; carapace strongly depressed, faintly convex in dorsal
profile; 3rd pereopod with dactyl twisted, with more or less carinate margins
*Harpiliopsis
13. Fifth abdominal somite with pleura sharp-pointed; mandible with palp
*Palaemonella
Fifth abdominal somite usually with pleura not sharp-pointed; mandible without
palp *Periclimenes
14. Body strongly compressed; lateral branch of uropod without marginal distolateral
tooth but with large, laterally curved spine at diaeresis Ischnopontonia
Body not strongly compressed; lateral branch of uropod with marginal distolateral
tooth, without hook-like spine at diaeresis 15
15. Lateral branch of uropod armed laterally with 5 or 6 strong, curved, hook-like teeth
Anapontonia
Lateral branch of uropod without series of hook-like teeth 16
16. Lateral branch of uropod with fixed tooth 17
Lateral branch of uropod usually armed only with mobile spines or unarmed . . .
42
17. Third pereopod with hollowed, hoof-shaped protuberance on dactyl
*Coralliocaris
Third pereopod without hoof-shaped protuberance on dactyl 18
18. Lateral carina of rostrum expanded into broad supraorbital or postorbital eave
19
Rostrum not broadly expanded into supraorbital or post-orbital eave 22
19. Rostrum dentate dorsally, supraorbital eave armed with 1 or 2 anterior teeth . 20
Rostrum not dentate in dorsal midline, supraorbital eave unarmed 21
20. Carapace unarmed in dorsal midline; abdomen with pleura of 5th somite rounded;
3rd maxilliped with well-developed exopod Araiopontonia
(Ryukyu Islands, Great Barrier Reef of
Australia, and Marshall Islands)
Carapace armed with 3 large teeth in dorsal midline; abdomen with pleura of 5th
somite sharp-pointed; 3rd maxilliped with exopod vestigial Balssia
(Mediterranean Sea and Guinea; 45-70 m,
associated with Precious Coral)
21. Body robust, squat, strongly depressed; 2nd pereopods subequal, strongly
compressed Notopontonia
(South Australia; 80 m)
Body elongate, subcylindrical; 2nd pereopods markedly unequal, subcylindrical
Stegopontonia
(Kenya and Zanzibar to Tuamotu Archipelago;
associated with echinoids)