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Branchiostoma lanceolatum
''Branchiostoma lanceolatum'' is a lancelet in the subphylum Cephalochordata. It is a marine invertebrate found in soft substrates in shallow seas. It is used as a model organism to study the development of vertebrates. The mitochondrial genome has been sequenced.〔〔(The Mediterranean amphioxus, ''Branchiostoma lanceolatum'', an emergent animal model for Evo-Devo studies. ) Retrieved 2011-11-14.〕
==Description==
''Branchiostoma lanceolatum'' has an elongated body, flattened laterally and pointed at both ends. A stiffening rod of tightly packed cells, the notochord, extends the whole length of the body. Above it is a nerve cord with a single frontal eye. The mouth is on the underside of the body and is surrounded by a tuft of 20 or 30 cirri or slender sensory appendages. The gut runs just below the notochord from the mouth to the anus, in front of the tail. There is a flap-like, vertical fin surrounding the pointed tail. Gas exchange takes place as water passes through gill slits in the mid region, and segmented gonads lie just behind these. The animal is pearly white and semi-transparent which enables the internal organs to be seen from outside. Its appearance is similar to a "primitive fish". It can grow up to 6 cm (2.5 in) long.〔〔(''Branchiostoma lanceolatum'' ) Marine Species Information Portal. Retrieved 2011-11-14.〕
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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