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Sorberacea are a monofamilial class of benthic Tunicates. They superficially resemble sea squirts but prey on invertebrates such as crustaceans. They also have some unique physical features that distinguish them from the ascidiaceans, including a severely reduced pharynx, the retention of the dorsal nerve cord as adults, the superficial position of their ganglion and the unique histology of the cells of their digestive tracts. The branchial syphon is large and surrounded by six large lobes; the cloacal syphon is small. They live exclusively in deep water and range in size from less than one inch (2 cm) to 2.4 inches (6 cm). The members of this group are not filter-feeders, and instead capture and eat nematodes and small crustaceans. They are solitary animals, found only in the deep sea. In a taxonomic revision of the Tunicata in 2007, the name "Hexacrobylidae" was declared invalid and members of the family were included in the family Molgulidae in the class Ascidiacea.〔Sanamyan, K. (2007). Database of extant Ascidiacea. Version of 2 November 2007〕 ==Taxonomy== Order Aspiraculata * Family Hexacrobylidae * * Genus ''Gasterascidia'' - accepted as ''Oligotrema'' Bourne, 1903 * * * ''Gasterascidia lyra'' - accepted as ''Oligotrema lyra'' Monniot C. & Monniot F., 1973 * * * ''Gasterascidia sandersi'' - accepted as ''Oligotrema sandersi'' (Monniot C. & Monniot F., 1968) * * Genus ''Hexadactylus'' - accepted as ''Asajirus'' Kott, 1989 * * * ''Hexadactylus arcticus'' - accepted as ''Asajirus indicus'' (Oka, 1913) * * * ''Hexadactylus eunuchus'' - accepted as ''Asajirus indicus'' (Oka, 1913) * * * ''Hexadactylus ledanoisi'' - accepted as ''Asajirus ledanoisi'' (Monniot C. & Monniot F., 1990) * * Genus ''Oligotrema'' - now included in the family Molgulidae * * * ''Oligotrema lyra'' * * * ''Oligotrema psammites'' * * Genus ''Sorbera'' - accepted as ''Oligotrema'' Bourne, 1903 * * * ''Sorbera unigonas'' - accepted as ''Oligotrema unigonas'' (Monniot C. & Monniot F., 1974) * * * ''Sorbera digonas'' - accepted as ''Oligotrema psammites'' Bourne, 1903 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aspiraculata」の詳細全文を読む スポンサード リンク
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