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Small sponge-covered Spider crab

Observed: 21st August 2012 By: Nick UptonNick Upton’s reputation in InvertebratesNick Upton’s reputation in InvertebratesNick Upton’s reputation in InvertebratesNick Upton’s reputation in Invertebrates
Spider crab (Inachus sp. ? dorsettensis/phalngium or leptochirus
Spider crab (Inachus sp.0 ? dorsettensis/phalangium or
Description:

Stunning little (2 cm carapace) spider crab among sponges and seasquirts in a Cornish rockpool. Definitely Inachus with very long 2nd legs, but I can't be sure if it's dorsettensis, phalangium or leptochirus and the distinguishing features on the rostrum/carapace are sponge covered - unless anyone knows other relevants charactera. I do have other photos, and could crop key features, but am not sure they'll reveal much more!

Identifications
Species interactions

No interactions present.