3454lablecture5 - Lecture 5 PHYLUM ANNELIDA Triploblastic,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
PHYLUM ANNELIDA Triploblastic, coelomate (formed thru schizocoely), protostomous, bilateral, closed circulatory system Metameric segmentation – repeated segments with organs, muscles, ganglia In Polychaeta and Oligochaeta, each segment is divided by a septa and acts as an independent hydrostatic skeleton Circular muscles – get skinny, Longitudinal muscles – bulge (each segment is independent), allows for efficient burrowing and locomotion Setae – bristles that aid in locomotion and burrowing Metanephridia are kidneys (each segment passes waste to next segment) CLASS POLYCHAETA Mostly marine, highly variable, specialized head parts, many setae Parapodia act as pseudo limbs and may be precursors of true limbs, used in locomotion, feeding, and sometimes respiration CLASS OLIGOCHAETA (Earthworms) Few setae, head region not specialized, outer cuticle, many hearts Prostomium – most anterior segment Parastomium – 1 st segment with organs Hermaphroditic – but reproduce sexually
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/29/2009 for the course BIOLOGY 3454 taught by Professor Nelson during the Spring '09 term at UT Arlington.

Page1 / 4

3454lablecture5 - Lecture 5 PHYLUM ANNELIDA Triploblastic,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online