Dental Specialties in US. The American Dental Association recognizes nine dental specialties in which dentists can get additional training and practice in addition to or instead of general dentistry: 1  Dental public health-Study of dental epidemiology and social health policies.
Trichinella spiralis is a parasitic worm that causes the disease Trichinosis. A whipworm is a roundworm that infects the large intestine. Whipworms are found commonly in pork and are often called pork-worms. They are also found in rats, humans, dogs and cats.
Four main species of sea urchins are distributed along the nearshore waters of Southern California: Lytechinus anamesus (white urchin), Centrostephanus coronatus (coronado urchin), Strongylocentrotus purpuratus (purple urchin), and Strongylocentrotus franciscanus (red urchin).here are ten classes in this phylum. Sea urchins are grouped as Echinoidea. Until recently, there was a clear-cut distinction between Echinoidea and other classes because they possess what was believed to be a unique lantern for mastication.