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New Zealand pea crab
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New Zealand pea crab : ウィキペディア英語版
New Zealand pea crab

The New Zealand pea crab, ''Pinnotheres novaezelandiae'', is a small, parasitic crab that lives most commonly inside New Zealand green-lipped mussels. Adult females are about the size and shape of a pea, while adult males are smaller and flatter. Adult New Zealand pea crabs are completely reliant on their host mussel for shelter and food, which it steals from the mussel's gills.〔 The New Zealand pea crab is found throughout New Zealand and can infect up to 70% of natural populations. These crabs are of concern to green-lipped mussel aquaculture because they reduce the size and growth of mussels, although infected mussels can be harvested and consumed.〔(【引用サイトリンク】title=Seafood Information & Nutrition )
==Description==

Adult female New Zealand pea crabs have a soft-shelled exoskeleton.〔 Their carapace is oval in shape, ranging in size from wide.〔 Sexually mature adult females almost always have eggs that are tucked under their abdomens, giving them a more spherical appearance.〔 Adult females are opaque white in colour.〔 Developing eggs change colour from red to orange to yellow before they hatch, giving the brooding mother a different tint at each stage. Adult male New Zealand pea crabs have a hard, chitinous exoskeleton.〔 Their carapace is smaller and more dorso-ventrally flattened than that of the female, ranging in size from wide.〔 Adult males are a creamy white colour with distinctive orange markings.〔


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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