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294 Family Callianassidae
Genus Callianassa ILeaeh, 1814
Key to species
[Adapted from Biffar, 1971a, with modification]
1. Front with lateral spinous projections 2
Front lacking lateral spinous projections ....5
2. (1) Third maxilliped lacking strong spinous crest on mesial surface of ischium, series
of small separate denticles; rostrum short, 0.25-0.33 times length of eyestalks
(posterior margin of telson concave) C. guassutinga
Strong spinous crest present on third maxilliped; rostrum usually more than 0.33
times length of eyestalks (occasionally shorter in C. rathbunae) .... 3
3. (2) Endopod of uropod elongate oval, twice as long as wide; telson widest midlaterally,
generally rounded in outline, posterior margin convex or straight (length of
eyestalks only 1.2-1.7 times width) —. C. acanthochirus
Endopod of uropod rhomboid or subtriangular; telson widest in anterior third,
trapezoidal 4
4. (3) Posterior margin of telson with triangular median projection (rostrum almost as
long as eyestalks; endopod of uropod subtriangular) C. longiventris
Posterior margin of telson lacking median projection (pigmented area of eyestalk
lateral, small, covering about 0.1 of exposed dorsal surface of eyestalk, mediodistal
projection acute or rounded, curving laterally; upper exopodal plate almost as long
as lower) C. rathbunae
5. (1) Rostrum triangular, rounded or acute, extending less than 0.25 length of eyestalks..
6
Rostrum elongate triangular, spinous or flattened dorsoventrally, acute, extending
more than 0.25 length of eyestalks 10
6. (5) Antennular peduncle extending beyond tip of antennal peduncle. 7
Antennular peduncle not extending beyond ti]p of antennal peduncle.. 8
7. (6) Posterior border of telson straight, with acute median projection; distomedial
projection of eyestalks elongate, slender, curving laterally; length of third
antennular segment five times length of second segment C. atlantica
Posterior border of telson concave; tip of eyestalks with short rounded projection;
length of third antennular segment three times length of second segment.,
C. fragilis