Bootlace and Annelid Worms Flashcards
What phyla do bootlace worms belong too?
Nemertea
What phyla do annelid worms belong too?
Annelida
A few characteristics of the phylum nemertea- Greek nymph.
Bootlace or Ribbon worms
Stretchy
Marine, freshwater, some terrestrial environments
Feed with hollow muscular PROBOSCICS EVERTS FROM RHYNCHOCOEL .
Carnviores
Mouth and anus
Protonephridia
What is the name of the giant bootlace worm?
Lineus longissimus
Examples of Annelida - Little ring.
Lumbricus, Hirudo, Nereis, Arenicola
Featured of Annelid worms
22,000 species
Metameric segmentation divided internally by septa
Nephridium
Flatworms can undulate and swim
What are the ways in which annelids move?
Earthworms- burrow and crawl
Ragworms- swim lateral undulations
Lugworms- irrigate in burrows
Leeches- swim by up-down undulations
Classes of Annelids
Oligochaeta - earthworms
Hirudinea- leeches
Polychaeta- all marine
Oligochaeta features
4 bundles chaetae
Sac for eggs at front of citellum
Cocoon forms round citellum and shed
Two worms lie side by side head to tail and exchange sperm
Hirdudinea
Leeches
No chaetae
3 jaws
Secrete hirudin
Polychaeta
Many bristles
Some carnivorous with toothed jaws
Some filter prey with feathery tentacles
BEAR PARAPODIA
Environmental sex determination
Isolated female, chemical from larger female triggers change to male
Eptioky
Segments swell and fill with gametes