In a reverse hierarchy, the conceptual pyramid of authority is turned upside-down, so that the apex is at the bottom and the base is at the top. This model represents the idea that members of the higher rankings are responsible for the members of the lower rankings.
Along the sides of the body is a light-colored horizontal stripe called the lateral line. The line is made up of a series of tiny pores that lead to receptors that are sensitive to the mechanical movement of water and sudden changes of pressure.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.he 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.
pair of pelvic fins, which serve as stabilizers and which in the male are modified to form claspers used in. copulation; two median dorsal fins , which also serve as stabilizers; and an asymmetrical caudal (tail) fin . The. spiny dogfish is so named for a pair of spines immediately anterior to each dorsal fin. These spines are often removed from dissection specimens as t hey are mildly poisonous! Identify the mouth with its rows of teeth (modified placoid scales), which are adapted for cutting and