<P> Scoliodon is a genus of requiem shark, and part of the family Carcharhinidae . It was formerly thought to include only a single Indo - Pacific species, the spadenose shark (S. laticaudus), but recent taxonomic research has found two species, and the formerly excluded junior synonyms need to be resurrected . </P> <P> Like most sharks, Scoliodon is marine, and is found in all open seas . </P> <P> Scoliodon has an elongated, spindle - shaped, body tapered at the ends, making it a very fast swimmer . The trunk and tail are laterally compressed, while the head region is dorsoventrally compressed . The entire body is covered by an exoskeleton of placoid scales . The mouth is located on the ventral side and is bound on both sides by jaws . It has two rows of homodont or polyphyodont teeth, which are homologous to the placoid scales covering the body.It is a marine fish . </P> <Ul> <Li> Scoliodon laticaudus J.P. Müller & Henle, 1838 (Spadenose shark) </Li> <Li> Scoliodon macrorhynchos Bleeker, 1852 (Pacific spadenose shark) </Li> </Ul>

What type of scale is found in scoliodon