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Liocarcinus marmoreus

(Leach, 1814)


Paul Semmens Had this crab a couple of years ago at Penzance. Think it might be Liocarcinus marmoreus but not 100% sure so would welcome confirmation.

Message posted on Seasearch Identifications on 24 Sep 2012
Vinh Lam Anyone know what this guy is? It was coughed up by a Tub Gurnard I caught off Brighton. I'm guessing it's an immature of one of the swimming crabs (Portunidae) looking at it's back legs but which species?

Andy Rapson Liocarcinus vernalis?

Andy Horton Carcinus maenas or Liocarcinus vernalis.

Andy Horton http://www.glaucus.org.uk/c-maenas.htm I might even favour the Shore Crab.

Andy Rapson The rear pair of legs look to flattened to me for it to be Carcinus maenas. I've been looking through some books and it does seem to match Liocarcinus marmoreus fairly closely but I'm not really familiar with that species so it makes it more difficult to tell.

Vinh Lam I agree, none of the photos I have of similar sized Shore Crab have as rounded real legs as this one. Also the second last segment is pretty rounded and not seen on any of my shore crabs either. I would say that it is a Liocarcinus but which one?

Message posted on British Marine Life Study Society on 01 Sep 2013
Taxonomy
Animalia (Kingdom)
  Arthropoda (Phylum)
    Crustacea (Subphylum)
      Malacostraca (Class)
        Eumalacostraca (Subclass)
          Eucarida (Superorder)
            Decapoda (Order)
              Pleocyemata (Suborder)
                Brachyura (Infraorder)
                  Eubrachyura (Section)
                    Heterotremata (Subsection)
                      Portunoidea (Superfamily)
                        Polybiidae (Family)
                          Liocarcinus (Genus)
                            Liocarcinus marmoreus (Species)
Associated Species
Carcinus maenas (2)
Liocarcinus vernalis (2)