Download PDF as one large file - AToL Decapoda

Family Palaemonidae
Genus Periclimenaeus Borradaile 1915
Key to species
[Adapted from Chace, 1972]
1. Telson with anterior pair of dorsal spines arising from anterior fourth of segment.. 2
Telson with anterior pair of dorsal spines arising at end of anterior third of segment
or posterior thereto 8
2. (1) Movable finger of major chela of second pereopod extending distinctly beyond tip
of immovable finger P. chacei
Movable finger of major chela of second pereopod extending very slightly beyond
or reaching to tip of immovable finger 3
3. (2) Telson with 3 pairs of distal spines inserted in continuous line 4
Telson with lateral pair of distal spines inserted distinctly anterior to intermediate
and mesial pairs 6
4. (3) Rostrum with ventral tooth; carapace with small denticle or sharp tubercle posterior
to orbit; scaphocerite with anterolateral tooth distinctly overreaching blade
P. caraibicus
Rostrum unarmed ventrally; carapace without postorbital denticle; scaphocerite with
anterolateral tooth not overreaching blade ..5
5. (4) Third maxilliped with 2 distal segments broad, penultimate about two and one-half
times as long as broad; first pereopod with movable finger tapering to tip, not
strongly convex, carpus about one and one-third times as long as chela; minor
second pereopod with movable finger elongate, not semicircular ...P. ascidiarum
Third maxilliped with 2 distal segments unusually slender, penultimate about five
times as long as broad; first pereopod with movable finger strongly convex, carpus
about one and one half times as long as chela; minor second pereopod with movable
finger short and broad, nearly semicircular P. pearsei
6. (3) Major second pereopod with large tooth on opposable margin of immovable finger
fitting into cavity in movable finger; minor second pereopod with fingers longer
thanpalm P. bermudensis
Major second pereopod with large tooth on opposable margin of movable finger
fitting into cavity in immovable finger; minor second pereopod with fingers much
shorter than palm 7
7. (6) First pereopod unusually long and slender, carpus nearly twice as long as chela
..P. perlatus
First pereopod not abnormally long or slender, carpus less than one and one-half
times as long as chela (rostrum with 10-12 dorsal teeth; telson with posterior pair of
dorsal spines arising from posteror half of segment) P. wilsoni