Like all sharks, dogfish are elasmobranchs, which means they have cartilage instead of bone for a skeleton. Sharks also lack a traditional urinary tract, so they concentrate urea, a waste product, in their blood and excrete it through their skin.
Is dogfish bony or cartilaginous?
Cartilaginous fishes
Cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone. Shark fish are called dogfish because they travel and hunt in packs. Shark is a cartilaginous fish. Thus, the correct answer is option A.
Does a dogfish have a skeleton?
Spiny dogfish have sharp, venomous spines in front of both dorsal fins. Dogfish don’t actually have any bones! Their skeleton is made from cartilage which is the same substance you have in your nose!
Is dogfish a bony?
Dogfish, like all the sharks and rays, do not have a bony skeleton but one made of the softer cartilage. The fins are muscular. The long tail gives propulsion. This is a heterocercal tail, as compared to the homocercal tail of most bony fish e.g. Blenny.
What common feature is absent in dogfish?
There is no notch on the upper caudal lobe and the lower caudal lobe is not well-developed. There is no anal fin on the spiny dogfish.
Which fish has bony endoskeleton examples?
Torpedo, Sting ray, Dogfish, Rohu, Angler fish, Exocoetus.
Which are examples of bony fish?
Bony fishesLower classifications
What structures are unique to a dogfish?
The spiny dogfish has a double dorsal fin. The anterior dorsal fin is larger than the posterior dorsal fin. The spiny dogfish has the presence two spines, one immediately in front of each dorsal fin. The spines carry a poison secreted by glands at their base.
What are the characteristics of a dogfish?
Appearance
- Spiny dogfish are slim, with a narrow, pointed snout and characteristic white spots.
- They are gray above and white below.
- They have two dorsal fins with ungrooved large spines.
- Males grow up to 3.3 feet, and females grow up to 4 feet.
What type of body shape does a dogfish have?
The Prickly Dogfish has a hump-backed body with a flat lower surface. The body is nearly triangular in cross-section. The species has prominent abdominal ridges, two sail-like dorsal fins which are each preceded by a spine, and lacks an anal fin.
Which is not a bony fish?
Class Chondrichthyes (Sharks, Skates, and Rays)
All members of the class Chondrichthyes have a skeleton made of cartilage rather than bone. This is useful because cartilage is lighter and more flexible than bone. Chondrichthyes lack an air bladder, which means they have a natural tendency to sink.
What are the 3 types of bony fish?
Living Osteichthyes are divided into three subclasses: Dipnoi, Crossopterygii, and Actinopterygii.
Which fish does not have skeleton made of bones?
Sharks, skates, rays and chimaeras stand apart from other jawed vertebrates in having a skeleton that is made primarily of cartilage rather than bone.
Is a dogfish an invertebrate or vertebrate?
The dogfish sharks are classified in the phylum Chordata, subphylum Vertebrata, class Chondrichthyes, order Selachii.
Do dogfish have sharp teeth?
Their teeth are pavement-like, but with an extra set of small, very strong and very sharp teeth (often difficult to see).
What internal organ is the shark lacking that is present in bony fish?
The bony fish, the Osteichthyes, possess a gas-filled swim bladder by means of which they can regulate their buoyancy allowing the fish to “float” at various depths under water. Sharks have no swim bladders.
What is the skeleton of bony fish?
The skeleton of bony fishes is made of bone and cartilage. The vertebral column, cranium, jaw, ribs, and intramuscular bones make up a bony fish’s skeleton.
What animals have a bony skeleton?
Mammals, birds, reptiles, amphibians and fish have bony skeletons. These skeletons come in all shapes and sizes, but they also share common features. Look at these skeletons and see how they differ from each other.
What animals have a bony endoskeleton?
Mammals, reptiles, birds, fish and amphibians are vertebrates with endoskeletons (skeletons inside their bodies). Their skeletons provide support and protection and help them to move.
Do sharks have bony skeletons?
Unlike fishes with bony skeletons, a shark’s skeleton is made out of cartilage. This is a flexible but strong connective tissue that’s also found throughout the human body, in places like the nose, ears, and in joints between bones.
What is the name of bony fish?
Osteichthyes
Osteichthyes (/ˌɒstiːˈɪkθi.iːz/), popularly referred to as the bony fish, is a diverse taxonomic group of fish that have skeletons primarily composed of bone tissue. They can be contrasted with the Chondrichthyes, which have skeletons primarily composed of cartilage.