Biology 20 – Kingdom Animalia – Phylum Annelida Notes • • • • Phylum Annelida (Pg. 696) This phylum includes the _________________________. The most commonly known worms in this phylum are ________________ ______________________________________________________ Annelids are ________________ symmetrical. They are found in terrestrial, freshwater and marine environments. General Characteristics • Entire body is divided ______________________________________. • The segment rings are called _____________. • The first segment is called the ________________ and the second is called the __________________. These 2 segments form the _____ of the worm. • They have a _______________________ body plan. • Annelids have a _____________ body cavity called a __________ which is lined with ________________. • They are the simplest of animals that have a _______________________. • The body of annelids & the remaining Phyla of animals have ___________ The 3 Germ Tissue Layers • These 3 layers produce all of the tissues of the body: • _________ produces: skin (outer layer), nervous system, cornea & lens, etc • _________ produces: notochord, skeleton, muscles, circulatory system, etc. • _________ produces: digestive tract, lung epithelium, liver, many endocrine glands, etc. Systems Annelids have well developed _________________________. • __________- 2 layers of muscle (______________ and _______ muscles). Each segment’s muscles are independent of the other segments. Locomotion accomplished by muscles along with __________ (Nereis), or _________ (hair-like bristles) (earthworms). • Digestive- Complex. Eg. Earthworm – _____________________________ ______________________________________________________ • Their digestive system has 2 __________________________________ • Excretory- a pair of _______________ per segment which remove ___________________________ from the body. 1 Biology 20 – Kingdom Animalia – Phylum Annelida Notes • Respiratory -through _________, some through parapodia; tubeworms have ______________. • Circulatory- _________________________________, red blood that uses ________________ as oxygen carrier. • Nervous- dorsal _______; ________________, with __________ in each segment. Responsive to touch, light, moisture & temperature • Reproductive Many are ________________ (both sex organs) but they cannot fertilize themselves. Sex organs located in the _______________ region. Must exchange sperm with another worm. Eggs are laid in a cocoon. Helpful & Harmful • Helpful _______________________________ _________________________________ __________________________________________________________ __________________________________________________________ • Harmful ___________________________________ Class Polychaeta - Nereis (clam worm) Have a pair of paddle like extensions on each segment called _____________ Aphrodite (sea mouse) Other Polychaetes: ____________________________________________ Class Hirudinea __________________________________ 2