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The viper dogfish is the only dogfish species that lacks a suborbital muscle, which is normally responsible for pulling the jaws forward when biting. Jaw protrusion is instead effected by the hyomandibular bone, which is articulated to the skull in a manner that allows it to swing down and forward.
Dogfish sharks have slate-grey or grey-brown skin with white dots that becomes paler (almost white) around the belly region. These sharks are characterized by teeth in upper and lower jaws similar in size; a caudal peduncle with lateral keels; the upper precaudal pit usually is present; and the caudal fin is without a subterminal notch.
Once it reaches a small shrimp or fish, it unhinges its enormous jaw to impale the creature and trap it inside its mouth. When it has caught its prey, it shuts its mouth and the little fish stays ...
Dogfish sharks: 3 31 Dogfish sharks have two dorsal fins, each with smooth spines, but no anal fin. Their skin is generally rough to the touch. [18] These sharks are characterized by teeth in upper and lower jaws similar in size; caudal peduncle with lateral keels; upper precaudal pit usually present; and a caudal fin without a
[11] [12] The lower jaw contains between 29 and 39 teeth that have one cusp, while the upper jaw contains between 21 and 26 teeth that have up to three cusps. [13] [14] Teeth are around 2 mm in length. [13] The maximum length of E. lucifer is about 47 cm. [13] Males range from 29 to 42 cm, while females are 34 cm or more in length. [13] [14]
The upper jaw contains three of the fours sets with small teeth usually having five cusps, and the lower jaw contains the fourth set with interlocking blade-like teeth with one cusp. [3] The gills of the Blackmouth lanternfish are relatively large, approximately oblique, and roughly all the same size. [3]
Squalus is a genus of dogfish sharks in the family Squalidae.Commonly known as spurdogs, these sharks are characterized by smooth dorsal fin spines, teeth in upper and lower jaws similar in size, caudal peduncle with lateral keels; upper precaudal pit usually present, and caudal fin without subterminal notch.
The blurred lanternshark (Etmopterus bigelowi) is a little-known species of dogfish shark in the family Etmopteridae, found around the world in benthic and pelagic habitats from a depth of 110 m (360 ft) to over 1 km (0.62 mi) down.