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Family Xanthidae
Key to genera and species
[Based on Rathbun, 1930, and Williams, 1984]
Family Xanthidae 603
1. Ridges defining efferent branchial channels, if present, low and confined to
posterior part of endostome, never reaching to anterior boundary of buccal cavity ..
. . 2
Ridges defining efferent branchial channels extending to anterior boundary of
buccal cavity and often very strong 25
2. (1) Fronto orbital border less than half greatest width of carapace 3
Fronto orbital border half or more than half greatest width of carapace .10
3. (2) Anterolateral border of carapace thin, cristiform; upper border at least of arms and
of merus, carpus, and propodus of each leg sharp, cristiform
Platypodiella spectabilis
Anterolateral border of carapace and upper borders of legs not cristiform 4
4. (3) Anterolateral border entire up to strong lateral epibranchial tooth; carapace perfectly
smooth without trace of regions; chelipeds unequal, fingers pointed; front threelobed
Carpilius corallinus
Anterolateral border cut into teeth or lobes 5
5. (4) Surface of carapace nearly smooth (superior inner tooth of orbit distinct though
small; anterolateral rim lobate or dentate and continued behind widest part of
carapace, its chord longer than posterolateral distance) Xantho denticulata
Carapace usually conspicuously lobulate, granulate, or eroded 6
6. (5) Carapace and legs deeply eroded Glyptoxanthus erosus
Carapace lobulate or granulate, chelipeds and walking legs also granulate, often
hairy 7
7. (6) Areoles low, separated by narrow furrows; marginal divisions of carapace
lobiform, not angular, dentiform or spiniform (carapace uniformly granulate; black
color of immovable finger of adult male widely extended on palm; fingers
grooved, sharply granulate) Platyactaea setigera
Areoles low or high and convex, separated by narrow or wide furrows; marginal
divisions of carapace various, angular, dentiform or spiniform 8
8. (7) Carapace covered dorsally with spines or sharp tubercles or carapace covered with
granules and areoles low, separated by narrow furrows Actaea
Carapace covered with granules and areoles high, convex, widely separated 9