Dissection Process Overview. The dorsal surface of the spiny dogfish is slate-colored and may have a brownish cast. There is a lateral row of small white spots along each side from above the pectoral fins to above the pelvic fins. The first is as an energy store since all fatty reserves are stored here. The cartilage in the rostrum is spongy and flexible, allowing the shark to absorb considerable impact with its nose. The Dogfish SharkâStructure and FUNction. The digestive tube looks uniform on the outside.
Classification Of Dogfish Shark
For fast, long distance swimming. As they make the first incision from the cloaca to the pectoral girdle, students will notice a tough piece of cartilage between the pectoral fins. Answered step-by-step. And out of the olfactory sac, permitting the shark to detect the odors of. Forced out by way of the gill slits. Of water and sudden changes of pressure. The mucosa is the inner lining of the stomach. The teeth of the porbeagle and mako are alike in both the upper and lower jaws. Pelvic fins Gonads (testes). Classification of dogfish shark. However, many synonyms referring to this species have been used in past scientific literature. These characteristics aid in the general movements of the shark in a variety of ways. It receives the products of the intestine, the. This is a sensory organ which helps in detecting the movement of water. These two fins may, or may not have spines at their origin.
The pectoral fins form nearly perfect equilateral triangles with rounded rear tips and slightly concave rear margins. Large spiracle openings are located posterior and. Oviduct orifice of the female. During copulation, one of the claspers is inserted into the.
Diagram Of Dogfish Shark
This species is thought to have the longest gestation period of any vertebrate (up to 24 months). A circular muscular valve, the pyloric sphincter, is located at the far end or pyloric end of the stomach. SOLVED: features of the external anatomy of the dogfish shark, Squalus acanthias, and state their functions Select. This tapered tip at the anterior end helps overcome water resistance. The lateral line, together with the ampullae of Lorenzini comprise the electrosensory component of the sharks sensory system. These include herring, menhaden, capelin, sand lance, and mackerel. Dermal denticles of the spiny dogfish are small and low with three cusps. The liver is rich in oil which stores energy for the shark.
External Anatomy Of A Shark
If you want to learn more about dogfish shark anatomy, here's a link to a website with more detailed information, as well as diagrams: If you have any questions regarding dogfish shark anatomy, dissection methodology, or general biology, feel free to leave a comment. Stripe called the lateral line. External anatomy of a shark. Before you reach the cloaca, you will see a slender, fingerlike projection alongside the digestive tube. At a J-shaped turn along the digestive tube, the stomach leads into the duodenum. This large, soft and oily organ can comprise up to 25% of the total body weight.
The ventral surface of the spiny dogfish ranges from pale gray to pure white. The shape, number and appearance of shark teeth varies considerably among shark species, and can be one of the most important features for species identification. External anatomy of dogfish share button. They are known to drive off commercially caught fish including mackerel and herring, while consuming large numbers of them. Please add your email address if you would like a reply.
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