BIOL 2001 Lecture Notes - Lecture 3: Parapodium, Prostomium, Bene Tleilax
23 Feb 2016
School
Department
Course
Professor
Document Summary
Lecture 3 - overview of major phyla ii. The cilia on the corona beat in a circular motion. Rotifer means wheel bearer in reference to the ciliated or setous structure called the corona o. Aquatic: most species are freshwater but some are marine or live in soil. The cilia on the corona bring food particles to the mouth and is used for locomotion. They have a muscular pharynx called a mastax that has a set of jaws called the trophi. Fixed number of cells (eutelic): growth occurs from cel growth not division. Organs are formed bt the fusion of cells. Well developed nervous system with about 200 neurons. Complex life cycle with at least two hosts. Adults attach themselves to intestinal wall or their host with a thorny proboscis. Bodies are formed of repeated segments and organ systems (metamerism) Eat segment is seperated by septa - thin sheets of tissue. Outer body wall formed by a flexible and permeable cuticle.
