Gadiformes
| Gadiformes Temporal range:
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|---|---|
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Gadus morhua
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Superorder: | Paracanthopterygii |
| Order: | Gadiformes Goodrich, 1909 |
| Type species | |
Gadus morhua Linnaeus 1758
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| Families | |
| |
Gadiformes estuaries. Pacific tomcods, one of the two species that makes up the genus Microgadus, are able to enter freshwater, but there is no evidence that they breed there. Some populations of landlocked Atlantic tomcod on the other hand, complete their entire life cycle in freshwater. Yet only one species, the burbot (Lota lota), is a true freshwater fish.[2]
Common characteristics include the positioning of the
pneumatic duct. The fins are spineless. Gadiform fish range in size from the codlets, which may be as small as 7 cm (2.8 in) in adult length, to the Atlantic cod, Gadus morhua, which reaches up to 2 m (6.6 ft).[3]
The earliest gadiforms are Palaeogadus weltoni from the Maastrichtian of the United States and the undescribed, informally named "Protocodus" from the Early Paleocene of Greenland.[4][5]
Timeline of genera
References
- ^ Iwamoto, T., Nakayama, N., Shao, K.-T. & Ho, H.-C. (2015): Synopsis of the Grenadier Fishes (Gadiformes; Teleostei) of Taiwan. Proceedings of the California Academy of Sciences, (Series 4), 62 (3): 31-126.
- ^ The Freshwater Fishes of British Columbia
- ISBN 0-12-547665-5.
- ISSN 0195-6671.
- ISSN 1374-8505.