Question

Features of annelida

Answer 1

General characteristics of Phylum Annelida
(Annelus: little ring)
Kingdom: Animalia
Habitat: mostly aquatic, some are terrestrial
Habit: free living
Symmetry: bilateral symmetry
Coelom: coelomate (Body cavity is a true coelom, often divided by internal septa)
Body is metamerically segmented
Grade of organization: organ system grade
Germ layer: triploblastic
Body possesses 3 separate sections, a prosomium, a trunk and a pygidium.
Digestive system: complete and developed
Respiration: by general body surface
Nervous system: nervous system with an anterior nerve ring, ganglia and a ventral nerve chord.
Circulatory system: Has a true closed circulatory system.
Excretion: by nephridia
Reproduction: Sexual and gonochoristic or hermaphoditic.
Fertilization: Internal or external
Development: direct with no larval stages.