Ostariophysi
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Ostariophysi is the second-largest superorder of fish. Members of this superorder are called ostariophysians. This diverse group contains 10,758 species, about 28% of known fish species in the world and 68% of freshwater species, and are present on all continents except Antarctica. They have a number of common characteristics such as an alarm substance and a Weberian apparatus. Members of this group include fish important to people for food, sport, the aquarium industry, and research.
Species
骨鳔类（學名：Ostariophysi）依不同的分类法也作骨鳔总目、骨鳔亚群，是辐鳍鱼纲的一个演化支，本类鱼都具有韦伯器官（英语：Weberian apparatus）（在第1至3椎骨两侧的4块小骨），鳔通常接鳔管与肠连接，一般各鳍无棘，如有腹鳍，在胸鳍后方为腹位。骨鳔类有6000多种鱼，世界上大部分淡水鱼都属于骨鳔类，最大的达4.5米，重达300千克，最小的只有几毫米，过寄生生活。骨鳔类中只有两科是生活在海水中。均为卵生。
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6 sectionsContents
- Description
- Weberian apparatus
- Diversity
- Taxonomy
- Evolution
- References
Ostariophysi is the second-largest superorder of fish. Members of this superorder are called ostariophysians. This diverse group contains 10,758 species, about 28% of known fish species in the world and 68% of freshwater species, and are present on all continents except Antarctica. They have a number of common characteristics such as an alarm substance and a Weberian apparatus. Members of this group include fish important to people for food, sport, the aquarium industry, and research.
==Description== Most species possess a swim bladder (except in Gonorynchus). The swim bladder is usually divided into two chambers. A smaller anterior chamber is partially or completely covered by a silvery peritoneal tunic. A larger posterior chamber may be reduced or absent in some groups. Minute, unicellular, horny projections known as "unculi" are commonly present on various body parts and are only known from ostariophysians.