In the thoracic region the intervertebral discs are relatively thin with respect to the vertebral bodies, and together with the presence of the ribs and sternum, their movement is limited.
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.hile these common names may apply to several species, Squalus acanthias is distinguished by having two spines (one anterior to each dorsal fin) and lacks an anal fin. It is found mostly in shallow waters and further offshore in most parts of the world, especially in temperate waters.
The mako shark body color is very similar to the color of the other grey-blue sharks. Shark color can vary from grey-blue and blue to light gray, almost white. The predator has no swim bladder, and the only reason why it does not sink is because it is in constant motion throughout its life.The Mako sharks main diet consists of large marine fish: scomber, tuna, mackerel, herring and others.enus: Mako sharks. Mako shark is better known as grey-blue shark. However, it still has a few other names: bonito shark, mackerel shark, black winged shark, blue pointer shark. It should also be noted that during the last century experts have described another kind of mako sharks: the Longfin mako shark.