Boschung, Herbert T. Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama.
Last reviewed:August 2020
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- Osmeridae (smelts)
- Salangidae (icefishes)
- Sundasalangidae (noodlefishes)
- Retropinnidae (New Zealand smelts)
- Lepidogalaxiidae (salamanderfishes)
- Galaxiidae (galaxiids)
- Related Primary Literature
- Additional Reading
An order of actinopterygian (ray-finned) fishes, including the salmons and trouts. Members of the order Salmoniformes belong to the class Actinopterygii. They are characterized by the following features: soft or articulated fin rays; the presence (usually) of an adipose dorsal fin; cycloid scales (scales are absent in a few species); pelvic fins in the abdominal region, with each having more than six rays and an associated axillary process (absent in the superfamily Osmeridea); a pelvic girdle that is free from the pectoral girdle; a pectoral fin that is placed low on the side and is more or less horizontal; an upper jaw that is usually bordered by premaxillae and maxillae; nonprotractile premaxillae; the presence (usually) of an orbitosphenoid bone as well as a mesocoracoid arch in the pectoral girdle; the absence of a Weberian apparatus connecting the swim bladder with the inner ear; a physostomous (connected to the esophagus) air bladder; and no luminescent organs. In addition, the larvae are not leptocephalous-like (elongate and flattened side to side). See also: Actinopterygii; Osteichthyes; Scale (zoology); Swim bladder; Teleostei
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