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610 Family Xanthidae
Genus Panopeus H. Milne Edwards, 1834
Key to species
[Based on Rathbun, 1930, and Williams, 1983]
1. Dark color of immovable finger continued more or less on palm, especially in males.
Dark color of immovable finger not continued on palm 7
2. (1) Outer edge of fourth lateral tooth longitudinal or nearly so. P. americanus
Outer edge of fourth lateral tooth arcuate 3
3. (2) Edge of front thick, beveled, and with transverse groove P. bermudensis
Edge of front if thick not transversely grooved 4
4. (3) Major chela with cusps of teeth on immovable finger not reaching above imaginary
straight line drawn between tip and angle at juncture of finger with anterior margin
of palm (= length immovable finger) 5
Major chela with cusps of teeth near midlength of immovable finger reaching above
imaginary straight line drawn between tip and angle at juncture of finger with
anterior margin of palm (= length immovable finger) 6
5. (4) Coalesced anterolateral teeth 1-2 separated by shallow rounded notch, 2 broader
than but not so prominent as 1; 4 curved forward as much as 3; 5 much smaller than
4, acute and hooked forward; palm with distance between crest at base of movable
finger and tip of cusp lateral to base of dactylus 0.7 or less length of immovable
finger P. herbstii
Coalesced anterolateral teeth 1-2 separated by deep rounded notch, adjacent slopes
of 1 and 2 about equal, 2 nearly as prominent as 1; 4 not curved forward as much as
3; 5 much smaller than 4, usually projecting straight anterolaterally, sometimes
slightly hooked; distance between crest of palm and tip of cusp lateral to base of
movable finger 0.8 or more length of immovable finger P. simpsoni
6. (4) Major chela with cusps of teeth in "molar area" of immovable finger very broad,
often coalesced and worn, their external faces often flared or bowed outward
P. lacustris
Major chela with cusps of teeth in "molar area" of immovable finger somewhat
enlarged but separated from each other, in line with axis of finger, not bowed
outward.. P. obesus
7. (1) Carapace and chelipeds rough and hairy; outer surface of palm with longitudinal
ridges P. rugosus
Carapace and chelipeds not noticeably hairy; outer surface of palm without three
longitudinal ridges 8
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