ZOO 2700 Study Guide - Final Guide: Nephridiopore, Vas Deferens, Mesothelium

98 views5 pages
1 Apr 2015
Department
Course
Professor

Document Summary

All are protostomes (blastophore in gut becomes mouth, spiral cleavage and cells are determinate) Marine annelids that range from raptorial predators, herbivores scavengers to sediment and filter feeders. Each segment has a pair of parapodia (unique to polychaeta) covered in chaetae, that are used for locomotion, and gas exchange. Distinct head w/ nuchal organs (eyes, palps, tentacles, antennae and cirri) Gonochoric (gametes ripen in the coelom from which they are shed through ducts or by rupture of the body wall) Nereis virens (ragworm, sandworm, clamworm) (species) large species up to a meter, shallow-water marine benthic *exemplary example of annelid, up to 200 segments: prostomium ( head )- dorsal to mouth, anterior containing fused segments. 4 eyes located on posterior dorsal surface of the postomium at four corners pair of palps. Pair of nuchal organs-crescent-shaped and chemosensory located near posterior border of prostomium. Pair of antenna: mouth - ventral to prostomium.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers

Related Documents