Arthropoda
Porcellana sayana
(White Polkadot Crab)
1. Out of water (Chris Freeman)
2. Out of water (Chris Freeman)
3. Out of water (Chris Freeman)
4. Out of water (Chris Freeman)
5. Out of water (Chris Freeman)
6. Out of water - image enlarged because it was taken through microscope lens (Leslie Bates)
Size
Carapace Width: 1.2cm (0.6") Carapace Length: 1.4cm (0.7")
Recognition Characters
Carapace is usually a little longer than wide, depressed. Dorsal surface is slightly granulate and has fine dorsal plication along sides. Rostrum is triangular, concave above, tip abruptly decurved, margins spinulate or turberculate. Large tooth borders exterior of each eye. Eyes are well developed. Antennae are long and slender, same length of carapace or longer. Chelipeds are strong and larger than carapace. Finely plicated, exterior smooth in older individuals, may be hairy in younger crabs. Last pair of walking legs are small compared to first 3 sets.
Color
Ground color is bright red to rusty red or brown. All dorsal surfaces and abdomen have irregular pattern of mostly white to creamy or yellowish white circular spots. Some spots near rear center part of carapace may be more longitudinal in shape. Rear legs have banded pattern of white and red.
Habitat & Depth
Found in crevices or clusters of oyster shells, among rocks of jetties, or commensally with hermit crabs. Often inhabit the inside of empty mollusk shells. Shallow water to 92m.
Distribution at GRNMS
Rare. May be found sharing mollusk shells with the hermit crabs Pagarus policaris and Petrochirus diogenes.
Geographic Range
North Carolina south to Brazil, Gulf of Mexico, Caribbean
Behavior & Notes
Synonyms