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Genus Pseudomedaeus Guinot, 1968
Key to species
[Adapted from Williams, 1984]
Family Xanthidae 613
Median frontal notch V-shaped, usually narrow; margins of anterolateral teeth either
spinous or with beadlike granules; carpi of chelipeds with strong internal spine,
sometimes double P. agassizii
Median frontal notch U-shaped; margins of anterolateral teeth almost always
smooth (rarely granulated); carpi of chelipeds with stout internal double spine
P. distinctus
Genus Tetraxanthus Rathbun, 1898
Key to species
Lateral projections of carapace shallow, not prominent; carpi and chelae of
chelipeds smooth with single lobe on inner margin of carpus T. rathbunae
Third and fourth lateral teeth prominent; carpus and proximal portion of outer
surface of palm distinctly rugose and having second, smaller tooth below and
behind prominent inner carpal tooth T. bidentatus