7 (6) Rostrum with no more than 5 ventral teeth, usually fewer; mandible without palp 



Palaemonetes 



A (7) Rostrum with first 2 teeth of dorsal margin behind orbit, dorsal rostral teeth 

 reaching to apex, ventral margin with 3 to 5 teeth; dactyl of second leg with 2 

 teeth, immovable finger with 1 on cutting edge; carpus of second leg in adult fe- 

 male shorter than palm, in males slightly longer or shorter (1.1 times) than palm 



P. vulgaris 



B 



Figure 12. — Palaemonetes vulgaris; A, carapace, lateral view; B, chela of second leg. 



A (7) Rostrum with only 1 dorsal tooth behind orbit; dactyl of second leg with single 

 tooth or without teeth, immovable finger without teeth on cutting edge; carpus 

 of second leg in adult female much longer than palm (1.3 to 1.5 times), in male 

 almost as long as whole chela 



B 



B (A) Rostrum with unarmed stretch before dagger-shaped tip, ventral margin with 2 to 



4, generally 3, teeth; fingers of second leg without teeth on cutting edges P. pugio 



Figure 13. — Palaemonetes pugio; A, carapace, lateral view; B. chela of second leg. 



B (A) Rostrum with dorsal teeth reaching up to often bifurcated apex, ventral margin 

 with 4 or 5 (seldom 3) teeth; dactyl of second leg with 1 distinct tooth on cutting 

 edge P. intermedins 



Figure 14. — Palaemonetes intermedins; A, carapace, lateral view; B, chela of second leg. 



7 



