|
''Planctoteuthis'' is a genus of chiroteuthid squid comprising five species, occurring worldwide in lower mesopelagic to bathypelagic depths in tropical to temperate waters. It has been suggested that members of ''Planctoteuthis'' are neotenic, retaining characteristics of the doratopsis developmental stage. This is marked in the retention of the paralarval tentacular club, unique among subadult chiroteuthids. Members lack both photophores and a funnel valve. The genus was originally placed within the monotypic family Valbyteuthidae, under the name ''Valbyteuthis''. Similarities between the paralavae of ''Valbyteuthis'' and ''Chiroteuthis'' led to its inclusion in the family Chiroteuthidae. Eventually, ''Valbyteuthis'' was incorporated as a junior synonym of ''Plantoteuthis'', citing previous descriptions of the paralarvae. ==Species== *''Planctoteuthis danae'' *''Planctoteuthis exopthalmica'' *''Planctoteuthis levimana'' *''Planctoteuthis lippula'' *''Planctoteuthis oligobessa'' 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「Planctoteuthis」の詳細全文を読む スポンサード リンク
|