Download PDF as one large file - AToL Decapoda

Genus Petrolisthes Stimpson, 1858
Key to species
[Based on Haig, 1956]
Family Porcellanidae 413
1. Telson of abdomen with 5 plates (3 or 4 teeth on carpus of chelipeds pointed,
denticulate; outer margin of manus with longitudinal groove; carapace, chelipeds,
and gape of fingers lightly pubescent) P. jugosus
Telson of abdomen with 7 plates. ...2
2. (1) Carpus of cheliped armed with 4 teeth or lobes; no spines (except epibranchial
spine) on lateral margins of carapace (carapace very rough with prominent,
transversepiliferousrugae) .....P. galathinus
Carpus of cheliped armed with 3 low, wide-set, spine-tipped teeth 3
3. (2) Carapace transversely rugose; epibranchial spine present P. armatus
Surface of carapace more or less smooth, not rugose; no epibranchial spine
P. politus
Genus Porcellana Lamarck, 1801
Key to species
[Adapted from Haig, 1956]
1. Median lobe of front rounded, not surpassing internal orbital angles; chelae without
hairs; length and breadth of carapace about equal P. stimpsoni
Median lobe of front pointed, surpassing internal orbital angles; chelae with fringe
of hairs on outer margin; carapace longer than broad 2
2. (1) Inner angle of carpus of cheliped with broad lobe; epibranchial angle low, rounded,
lobe-like, sometimes spine-tipped P. sayana
Inner angle of carpus with low, spine-tipped lobe; epibranchial angle with shaip
spine P. sigsbeiana