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Homarus gammarus
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==Ecology== Adult ''H. gammarus'' live on the [[continental shelf]] at depths of {{convert|0|-|150|m}}, although not normally deeper than {{convert|50|m|abbr=on}}.<ref name="MLW"/> They prefer hard [[substrate (biology)|substrates]], such as rocks or hard mud, and live in holes or crevices, emerging at night to feed.<ref name="MLW"/> The diet of ''H. gammarus'' mostly consists of other benthic [[invertebrate]]s. These include [[crab]]s, [[Mollusca|molluscs]], [[sea urchin]]s, [[starfish]] and [[polychaete|polychaete worms]].<ref name="NLH"/> The three clawed lobster species ''Homarus gammarus'', ''[[American lobster|H. americanus]]'' and ''[[Nephrops norvegicus]]'' are hosts to the three known species of the animal phylum [[Cycliophora]]; the species on ''H. gammarus'' [[undescribed species|has not been described]].<ref>{{cite journal |first=Jessica M. |last=Baker |first2=Gonzalo |last2=Giribet |year=2007 |title=A molecular phylogenetic approach to the phylum Cycliophora provides further evidence for cryptic speciation in ''Symbion americanus'' |journal=[[Zoologica Scripta]] |volume=36 |issue=4 |pages=353β359 |doi=10.1111/j.1463-6409.2006.00288.x|s2cid=84418494 }}</ref> ''Homarus gammarus'' is susceptible to the disease [[gaffkaemia]], caused by the [[bacterium]] ''[[Aerococcus viridans]]''.<ref name="CEFAS"/> Although it is frequently found in [[American lobster]]s, the disease has only been seen in captive ''H. gammarus'', where prior occupation of the tanks by ''H. americanus'' could not be ruled out.<ref name="CEFAS"/>
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