Notorynchus
Notorynchus is a genus of sharks in the family Notorynchidae, commonly known as cow sharks or broadnose sevengill sharks. These ancient sharks are characterized by their distinctive broad, flattened snouts, seven gill slits, and a unique dorsal fin arrangement.
Common Names
The genus Notorynchus is known by various common names, including:
- Cow shark
- Broadnose sevengill shark
- Sevengill shark
- Spotted cow shark (for Notorynchus maculatus)
- Spotted sevengill shark (for Notorynchus maculatus)
Characteristics
Members of the Notorynchus genus possess several unique characteristics that distinguish them from other shark species:
- Broad, flattened snout: This feature gives them their common name "broadnose sevengill sharks."
- Seven gill slits: As their name suggests, these sharks have seven gill openings on each side of their head, a feature uncommon in other shark species.
- Two dorsal fins: Unlike most sharks that have a single dorsal fin, cow sharks have two dorsal fins, with the first being larger and situated further forward on the body.
- Two anal fins: This is another unusual feature for sharks, as most species possess only one anal fin.
- Large, powerful jaws: Cow sharks are known for their formidable jaws, equipped with rows of sharp, pointed teeth, suited for catching and consuming prey.
Environments
Cow sharks are found in temperate waters around the world, inhabiting both coastal and oceanic environments. They prefer sandy or muddy bottoms, often found in depths ranging from the surface to over 1000 meters. They are generally found in areas with relatively cool water temperatures, preferring depths where light levels are low.
References
For more detailed information on the Notorynchus genus, please refer to the following resources: