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Ptychophorae is a suborder of rhizostome jellyfish, identified in 2013 by Gershwin and Davie. The etymology of the word Ptychophorae is from the Greek ptychos (fold, leaf, layer) and phoras (bearing), in reference to the hooded rhopalia. ==Distinctive features== Ptychophorae are distinguished by the following features: * The body is globular. * The oral arms coalesce into a single short, ridged column, without scapulets. * The rhopalia is hooded, lacking typical pits. * There are 4 velar lappets per octant. * There 2 asymmetrical ocular lappets per octant. * The annular muscles are conspicuous. * The subgenital ostia are very small and round. * The stomach is circular and large. * There are 4 radial canals per octant, proximally unbranched, and fluted, and peripherally coalesced into vast open sinus with patchwork of jelly matrix. 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「Ptychophorae」の詳細全文を読む スポンサード リンク
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