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Acochlidiacea
Acochlidiacea, common name acochlidians, are a taxonomic clade of very unusual sea snails and sea and freshwater slugs, aquatic gastropod mollusks within the large clade Heterobranchia. Acochlidia is a variant spelling.
== Description ==
These are mostly very small animals, without a shell or gills, distinguished by the visceral mass being sharply set off from the rest of the body.
Being a small group with only 30 species worldwide known in 2010,〔There are 29 valid species plus one undescribed species〕 and 32 species described in 2011,〔 and 33 in 2012 (+9 undescribed ''Pontohedyle'' species),〔 these slugs are morphologically and biologically highly aberrant and diverse, comprising a series of unusual characters (e.g. secondary gonochorism, lack of copulatory organs, asymmetric radulae).〔 Most acochlidians live interstitially in marine sands, while some have conquered limnic systems (uniquely within opisthobranch gastropods).〔
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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