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''Sepioteuthis lessoniana'', commonly known as the bigfin reef squid or oval squid, is a commercially important species of loliginid squid. It is one of the three currently recognized species belonging to the genus ''Sepioteuthis''. Studies in 1993, however, have indicated that bigfin reef squids may comprise a cryptic species complex. The species is likely to include several very similar and closely related species. Bigfin reef squids are characterised by a large oval fin that extends throughout the margins of its mantle, giving them a superficial similarity to cuttlefish. They are small to medium-sized squids, averaging in length. They exhibit elaborate mating displays and usually spawn in May, but it can vary by location. The paralarvae resemble miniature adults and are remarkable for already having the capability to change body colouration upon hatching. Bigfin reef squids have the fastest recorded growth rates of any large marine invertebrate, reaching in only four months. They are a short-lived species, with a maximum recorded lifespan of 315 days. The diet of bigfin reef squids comprises mainly crustaceans and small fish. They are found in the temperate and tropical waters of the Pacific and Indian Oceans, and have recently been introduced into the Mediterranean as a Lessepsian migrant. They are commonly found near the shoreline, near rocks, and coral reefs. They are fished in vast quantities for human food in Asia. Because of their rapid growth rate, short life span, and tolerance to handling and captivity, bigfin reef squids are regarded as one of the most promising species for mariculture. They are also a valuable source of giant axons for medical research. == Taxonomy and nomenclature == Bigfin reef squids are also known as northern calamary in Australia and New Zealand, to distinguish them from the southern reef squid (or southern calamary), ''Sepioteuthis australis''.〔 Other common names include green-eyed squid in English, ''koonthal'' in Malayalam, in Tamil, フランス語:''calmar tonnelet'' in French, in Spanish,〔 ドイツ語:''Großflossen-Riffkalmar'' in German, in Hawaiian, in Chinese,〔(【引用サイトリンク】title=Common names of ''Sepioteuthis lessoniana'' )〕 in Malaysian,〔 (''aori-ika'') in Japanese, and in Burmese.〔(【引用サイトリンク】title=Fish Around Myanmar Maintenance )〕 ''Sepioteuthis lessoniana'' is one of the three currently recognised species classified under the genus ''Sepioteuthis'' of the pencil squid family, Loliginidae. It belongs to the suborder Myopsina of the squid order Teuthida. ''Sepioteuthis'' literally means 'cuttlefish squid', from (''sēpía'', 'cuttlefish') and (''teuthis'', 'squid'). It was first described by the French naturalist André Étienne d'Audebert de Férussac and named after René Primevère Lesson. The type specimen was collected by Lesson off the coast of New Guinea during the circumnavigational voyage of the French corvette ''La Coquille'' (1822–1825) under the command of Louis Isidore Duperrey. Numerous other species of ''Sepioteuthis'' were described from the Pacific and Indian Oceans in the late 19th century and in the early 20th century. In 1939 the Belgian malacologist William Adam examined the specimens of ''Sepioteuthis'' recovered from the tropical western Pacific. He synonymised the twelve species then considered valid under ''Sepioteuthis lessoniana''.〔 A study in 1993 by Segawa ''et al.'' revealed that the population of ''S. lessoniana'' in Okinawa may actually be composed of three distinct species. This was confirmed in genetic studies by Izuka ''et al.'' in 1994. Triantafillos and Adams in 2005 also showed that ''S. lessoniana'' in Shark Bay, Australia is composed of two species. These findings indicate that ''S. lessoniana'' may actually comprise several very similar and closely related species. It is now believed that ''S. lessoniana'' is a cryptic species complex.〔 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「Bigfin reef squid」の詳細全文を読む スポンサード リンク
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