BIOL 110 Chapter Notes - Chapter 32: Nematode, Body Cavity, Protostome
Document Summary
Animals two - animals with body cavities: pseudocoelomates and protostome coelomates. Coelomates and psuedocoelomates: pseudocoelomates are not completely lined by mesoderm-derived tissue. Psuedocoelomates: the phylum nematoda: roundworms belong to nematoda, nematoda contains. Pests and parasites: fluid filled pseudocoelom of these animals can function as a hydrostatic skeleton. Useful for drilling through soil or a host"s body tissue. Annelids also have hydrostatic skeletons: giant kidney worms. Eggs leave in body in the host"s urine. Can be transferred to fish or amphibians. Secondary hosts consumed, infection cycle complete: other nematodes. Hookworms latch on to a host and penetrate their intestines and other organs. Coelomates: protostomes versus deuterostomes: distinction between proto and deuterostomes, one of the main differences: their gut. Arthropodes shoe the protostome condition for both cleavage. Protostome coelomates: the phylum mollusca: mollusca has aquatic and terrestrial species. Clams, snails, octopuses, sea slugs: soft bodies, protected by hard calcium carbonate shell.
