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Description

 Idotea granulosa has an elongated body that is oval in shape, sharply narrowing posteriorly and dorsoventrally flattened. The antennae are less than one-fifth of the overall body length. Males are 5-20 mm in length, where females are 6-13 mm in length. It is uniformally brown, red or green with occasional white longitudal markings along its back.   In adults pleotelson initially narrows quite sharply having concave lateral sides & forming a distinct median blunt point.Idotea granulosa colour varies depending on the nature of the algae inhabited. Larger specimens are found on the brown algae Ascophyllum nodosum and Fucus spp. Smaller specimens are found on green algae Cladophora spp. and Polysiphonia spp.

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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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