Zoology

agnatha - class of jawless fishes, lampreys, and hagfishes amphibia - class of salamanders, frogs, caecilians Annelida - phylum of segmented worms Anthozoa - What class are sea anemones and corals in? they are in phylum cnidaria Apoda - order of caecilians Arachnida - class of spiders, scorpions, ticks, and mites archenteron - The central cavity in the gastrula stage of embryological development; it is lined by endoderm and ultimately gives rise to the adult digestive tract. Arthropoda - phylum of spiders, scorpions, insects, crabs, and shrimps artiodactyla - order of deer, pigs, sheep, giraffes, and cattle asteroidea - class of sea stars aves - order of birds bilateral symmetry - Body plan in which only a single, imaginary line can divide the body into two equal halves. Bivalvia - what is the class of clams, mussels, and oysters