01:119:115 Lecture Notes - Lecture 6: Hirudo Medicinalis, Gastrovascular Cavity, Circulatory System

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: Bendoud

Document Summary

Ch 33-24: overview: life without a backbone (fig 33. 2) a. a. i. a. ii. a. iii. Develop either or both: a lophophore for feeding, a trochophore larval stage, but few have neither feature a. ii. most members have a coelom and digestive tract with two openings a. iii. Lophotrochozoans:flatworms, phylum platyhelminthes a. iii. 1. a. iii. 2. a. iii. 3. a. iii. 4. live in marine, freshwater, damp terrestrial habitats. Include free living planarians. eg dugesia fig 33. 10 and parasitic spp eg tapeworm fig 33. 12 a. iv. Tiny multicellular organisms that inhabit freshwater ocean and damp soil a. v. Lophotrochoazoan lophophorates a. v. 1. have a lophophore (crown of ciliated tentacles around mouth) and true coelom a. vi. Lophotrochozoan molluses a. vi. 1. mostly marines, freshwater and terrestrial soft bodied coelomates protected by hard shell of caco3 fig 33. 15 a. vi. 2. a. vi. 3. a. vi. 4. a. vi. 5. Include snails slugs oysters clams octopi and squids. Mantle: thin sheet of tissue covering visceral mass - with glands thet secrete shell if present a. vi. 6. a. vi. 7.