The anatomy of a dogfish shark

Labeled Side View Examine the anterior view photographs of the shark by clicking the blue lettered links in the column to the right. The rostrum is the pointed snout at the anterior end. This tapered tip at the anterior end helps overcome water resistance in swimming.

The anatomy of a dogfish shark

Labeled Side View Examine the anterior view photographs of the shark by clicking the blue lettered links in the column to the right.

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The rostrum is the pointed snout at the anterior end. This tapered tip at the anterior end helps overcome water resistance in swimming. The eyes are prominent in sharks and are very similar to the eyes of man. A transparent cornea covers and protects the eye.

A darkly pigmented iris can be seen below the cornea with the pupil at its center.

The anatomy of a dogfish shark

Upper and lower eyelids protect the eye. Just inside the lower lid is a membrane that extends over the surface of the eye to cover the cornea. Large spiracle openings are located posterior and dorsal to the eyes. A spiracular valve, permits the opening and closing of the external spiracular pore.

The spiracle is an incurrent water passageway leading into the mouth for respiration. Most sharks have five external gill slits located on thire sides behind the mouth and in front of the pectoral fins. Water taken in by the mouth and spiracles is passed over the internal gills and forced out by way of the gill slits.

Labeled Anterior Examine the bottom view photographs of the shark by clicking the blue lettered links in the column to the right. The paired pectoral fins act like an airplane's wings to provide the lift needed to keep the shark from sinking.

The paired pelvic fins are located on either side of the cloacal aperture. They are different in males and females. Labeled Bottom View Examine the photographs of the shark's snout by clicking the blue lettered links in the column to the right. The opening to the mouth of sharks is always on the underside.

The teeth are sharp and pointed. There are several rows of flattened teeth lying behind the upright set ready to replace them when worn out or lost.

The nares or external nostrils are located on the underside ventral surface of the rostrum anterior to the jaws. A nasal flap separates the incurrent from the excurrent opening.

Water passes into and out of the olfactory sac, permitting the shark to detect the odors of the water. The patches of pores on the head in the areas of the eyes, snout, and nostrils are the openings of the ampullae of Lorenzini.

These sense organs are sensitive to changes in temperature, water pressure, electrical fields, and salinity. Labeled Snout Examine the photographs of the male shark's pelvic region by clicking the blue lettered links in the column to the right.

Males have stout, grooved copulatory organs called claspers on the inner side of their pelvic fins. Fertilization in the dogfish shark is internal.

During copulation, one of the claspers is inserted into the oviduct orifice of the female. The sperm proceed from the cloaca of the male along the groove on the dorsal surface of the clasper into the female. Labeled Male Pelvis Examine the photographs of the female shark's pelvic region by clicking the blue lettered links in the column to the right.

The cloacal opening located on the ventral surface between the pelvic fins. It receives the products of the intestine, the urinary and the genital ducts. The name cloaca, meaning sewer, seems quite appropriate. Labeled Female Pelvis Examine the photographs of the skinned shark by clicking the blue lettered links in the column to the right.Get Textbooks on Google Play.

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The anatomy of a dogfish shark

Read, highlight, and take notes, across web, tablet, and phone. A representative squaloid, the Spiny Dogfish or "Spurdog" (Squalus acanthias) — probably the world's best known (if not most beloved) shark — showing the dorsal fin spines, transverse mouth, and lack of an anal fin characteristic of the group.

Note that in the Spiny Dogfish and other members of the family Squalidae, there is no subterminal lobe (flap on the upper caudal lobe separated from the rest of the . Dogfish Anatomy Dogfish Shark Diagram. By sbastian fangrut On September 23, dogfish Recent Class Questions if you were to identify a branch of government that championed the rights of black americans in the immediate aftermath of the civil war, it would be.

Shark anatomy has points of difference with the anatomy of bony and other types of fish. such as the kitefin shark, a species of dogfish shark. The species migrates vertically and the arrangement of light-producing organs called photophores provides ventral countershading.

The spiny dogfish, spurdog, mud shark, or piked dogfish (Squalus acanthias) is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order.

Squaliformes: Dogfish Sharks