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(Pennant, 1777)

Carapace much longer than broad, anteriorly granular, posteriorly striate; frontal region produced and with a median longitudinal furrow; rostrum small, bidentate. Antennal flagellum longer than carapace width and usually longer than carapace length. Antero-lateral margins of carapace with three teeth, postero-lateral margins sometimes with a small tooth. Pereiopods depressed, anteriorly setose, dactyli long and thin. Female chelipeds about as long as carapace length, propodus broad, somewhat flattened; abdominal segments free. Male antennal flagella longer than in female; chelipeds much longer than carapace length, propodus long and subcylindrical; abdominal segments 3-5 fused.

Carapace length up to 23 (39) mm.

Depth range from lower shore in sand to about 55 metres. Washed ashore in large numbers after storms. Ovigerous March-September, larvae January-July.

Carapace pale mauve or reddish brown, epibranchial regions often grey. Chelipeds pale mauve, pereiopods yellowish-white, tips of dactyli brown.

Aberdeen, Firth of Forth, Northumberland, Dogger, Yorkshire, Wash, Thames, East Channel, Wight, Portland, Channel Isles, Plymouth, Scilly Isles, Bristol Channel, Anglesey, Liverpool Bay, Isles of Man, Dublin, Belfast, Clyde & Argyll, Minch, Mayo, Galway Bay, Fastnet, Cork, Fisher.

Corystes cassivelaunus