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Phylum: ANNELIDA

characteristics, structures and essential life functions

QuestionAnswer
what does ANNELIDA mean? ANNELIDA means "small rings" but commonly called earthworms
where do they live? mostly terrestrial or aquatic
what type of symmetry do they have? they have Bilateral symmetry
Do they have Cephalization They have ganglia and a head region
How many germ layers do they have? They have 3 germ layers
Do they have a coelom? Yes, they are true coelomates
How do Earthworms move? They have bristles called Seta on the outside and internal longitudinal muscle
What are some classes of ANNELIDA? Class: Oligochaete, Polychaeta, Hirudinea
describe subclass Oligochaete " Oligochaete" means "just a few setae", example would be Earthworm.
describe subclass Polychaeta Marine worms with many setae, example would be clamworms
describe subclass Hirudinea often aquatic worms with suckers but lack setae, example would be leaches
How do earthworms MOVE? With a circular and longitudinal muscle, by contracting and stretching
How does FEEDING/DIGESTION/EXCRETION work? Earthworms have a complete digestive system. Mouth --> Pharynx --> esophagus --> Crop (stores food)--> Gizzard (break down food) --> Intestine --> Anus
How does METABOLIC EXCRETION Eliminated by Nephridia organ through pore
What type of CIRCULATION do earthworm shave? they have dorsal + ventral blood vessels and 5 hearts
How does RESPIRATION work? Diffusion through skin
What type of NERVOUS SYSTEM do they have? Ganglia and one ventral nerve cord
What does REPRODUCTION look like Cross fertilization in clitellum --> clitellum secrets mucus cocoon --> sperm + egg are fertilized
Created by: chloe_well
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