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.
Information About Lionfish. Information About Lionfish. The lionfish is as well identified as Turkey Fish, Fire or Scorpion Fish. They have exceptionally extended and separated spines, and include generally striped forms in various colors, like green, red, navy green, orange, brown, yellow, maroon, black, or white.More...Facts About Lionfish.he lionfish is as well identified as Turkey Fish, Fire or Scorpion Fish. They have exceptionally extended and separated spines, and include generally striped forms in various colors, like green, red, navy green, orange, brown, yellow, maroon, black, or white. More... Facts About Lionfish.