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Phylum Annelida General Characteristics Bizarre gills!!! What are they? Round worm-like animals which are ______________________. The name comes from the Latin “annellus” which means __________ __________. • Appearance of the _________. A ring in French is call _______. Can range in size from less than ____________ to more than ________! • Mostly _________-like in appearance. The body segments are separated internally by walls of tissue called ________. • Singular ~ _____________. Most segments are ____________, however some are ____________________. General features of a segment. Annelids also have a ________ coelom like us, meaning that the entire body _________ is lined with _________________ tissue. Platyhelminthes Nematoda Annelida This is of course a simplified diagram. Digestive System A one-way digestive tract, so they have an _______. There are many ________________ compartments. This is a general plan although it _____________ between species and classes. 1. Food enters the _____________. 2. Food enters the _____________, a muscular tube. • Can be protruded through the mouth. • Carnivorous species have powerful ___________ attached to lunge and catch prey!!! • Herbivorous worms also have jaws to bite off bits of ____________. Nom nom nom! • Pharynx can act as a __________ surface or a ________________ for those annelids that are __________ feeders. (eat ____/_____/______) • Can also be a pump to suck up _________ and ____________ in ______________ species. 3. Food then enters the ___________ where it is moved by ________________. • Muscular waves of the gut wall. 4. Food leaves via the _____________. Respiratory System Marine worms often breathe through _________ called __________ or ____________ (singular). • Thin extensions of the body _________. Some marine worms can have large, fan-like gills. ~ see slide #2. Circulatory System Possess a circulatory system! It is a _______________ circulatory system with ____________________ vessels. • The system has _____________ main blood vessels, a ________ and _______ blood vessel. • Located on top and underneath of the ______. • Supply blood to the internal organs. Dorsal blood vessel Ventral blood vessel The earthworm has ___ contractile “___________”. • Pumping ring vessels. 5 “hearts” Excretory System Solid wastes from digestion pass through the _____________. Metabolic wastes such as ______________ are released via the ______________________. • More advanced versions of the _______________ we saw in Platyhelminthes. • Metanephridia: A _________ that collects wastes from the body ____________ and releases them ______________. (A pair per segment) • Earthworms also release wastes via their ______. Metanephridia Metabolic wastes in. Metabolic wastes excreted. Nervous System Many annelids are active animals with well developed ______________ _______________. They have a ______________. The brain is at the _________, (_______________), and sits on top of the digestive tract. • Associated with a _______ _____ that goes around the gut with a pair of ___________ at the bottom. A large ________________ nerve cord then runs the length of the body. Each ___________ has nerves that branch off the __________ nerve cord and a pair of _________. • What does this remind you of? Brain Segmental nerves Gut Nerve Ring Ventral Nerve Cord Reproductive System Some annelids can reproduce _____________ by __________________, but not many. Marine species are often ___________________ and have __________________ fertilization. Earthworms and leeches are often _______________________ and have ______________ fertilization.
