BIO 1106 Lecture Notes - Lecture 1: Gastrovascular Cavity, Symmetry In Biology, Hookworm Infection
Document Summary
Be able to differentiate between classes within phyla. Focus on pictures in lab manual as examples. Pay attention to anterior vs. posterior ends of worms. Characteristics= dorsoventrally flattened bodies, bilateral symmetry, true organ systems, triploblastic (3 true germ layers- ectoderm, endoderm, mesoderm), one opening to gastrovascular cavity (mouth and anus are same opening), acoelomate (have no body cavity) Dugesia: commonly called planaria, whole mount (fig. Opisthorchis: also known as clonorchis, chinese liver fluke, anterior vs. posterior and internal anatomy, whole mount (fig. Fasciola: sheep liver fluke, very large, anterior vs. posterior and internal anatomy, whole mount (fig. Schistosoma: blood fluke, causes schistosomiasis, dioecious worm (separate male and females, slide showing male and female in copulation (fig. Taenia: slides showing stages (scolex, immature, mature, and gravide proglottids, specimen in jar. Characteristics= bilateral symmetry, very round body (due to hydrostatic pressure), true organ systems, triploblastic, complete digestive tract (separate mouth and anus), pseudocoelomate (false cavity- not surrounded by mesoderm)
