What does the spiracle do on a dogfish shark?

What does the spiracle do on a dogfish shark?

The spiracle closes when the mouth is closed by the contraction of the levator palatoquadrati, rostral levator hyomandibulae and spiracular muscles.

What is a spiracle fish?

The spiracle is a small hole behind each eye that opens to the mouth in some fish. The spiracle is still found in all cartilaginous fish except requiem sharks, hammerhead sharks, and chimaeras, and is found in some primitive bony fishes (coelacanth, sturgeon, paddlefish and bichirs).

Do sharks have nostrils?

Myth #5: Sharks Can Detect a Single Drop of Blood in the Ocean. Sharks do, however, have an acute sense of smell and a sensitive olfactory system–much more so than humans. Sharks’ nostrils are located on the underside of the snout, and unlike human nostrils, are used solely for smelling and not for breathing.

What is a spiracle and state its importance?

A spiracle or stigma is the opening in the exoskeletons of insects and some spiders to allow air to enter the trachea. In the respiratory system of insects, the tracheal tubes primarily deliver oxygen directly into the animals’ tissues. The spiracles can be opened and closed in an efficient manner to reduce water loss.

What are benthic sharks?

Benthic sharks are shark species that spend their time on the ocean floor. We are fortunte enough to have a number of these animals along the coast of Gansbaai, South Africa and are busy developing a number of research projects focused on their ecology and behavior.

What means spiracle?

1 : a breathing hole : vent. 2 : a breathing orifice: such as. a : blowhole sense 2. b : an external tracheal aperture of a terrestrial arthropod that in an insect is usually one of a series of small apertures located along each side of the thorax and abdomen — see insect illustration.

What can you say about the spiracle?

a breathing hole; an opening by which a confined space has communication with the outer air; air hole. an aperture or orifice through which air or water passes in the act of respiration, as the blowhole of a cetacean. an opening in the head of sharks and rays through which water is drawn and passed over gills.

Is there a Megalodon shark alive today?

Megalodon is NOT alive today, it went extinct around 3.5 million years ago.