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Kröyer, 1837

Description:
Carapace hexagonal, broader than long, dorsal surface minutely rugose; submedian lobes prominent, inner orbital margins acute to subacute, ventrally with a strong tooth. Antero-lateral margins of carapace with three well developed acute teeth, first and second anteriorly directed. Chelipeds moderately stout, slightly unequal; pereiopods relatively long and thin, merus to propodus compressed, dactylus strongly depressed, third and fourth pereiopods slightly longer than others, fifth longer than major cheliped.

Size:
Carapace length up to 40 (80) mm.

Habitat:
Depth range beyond 82 metres. on soft mud. Ovigerous April (outside Area in January-March).

Colour:
Carapace reddish brown, pereiopods lighter.

Distribution:
Orkney, Viking, Firth of Forth.

Geryon tridens