*habitat-all are marine
*body form-unsegmented, star shaped, spherical or cylindrical.
*spine and pedicellariae- many echinoderm bear spine pincer like pedicellariae.
*symmetry-bilateral in larvae and pentamerous in adults.
*germ layer-triploblastic
*level of organisation-organ system level
*body wall-epidermis is single layered and ciliated
*body cavity-enterocoelic coelom
*ambulacral system( water vascular system)-presence of ambulacral system is the characteristic feature of phylum echinodermata.
*digestive tract-incomplete digestive tract
*respiratory organ-dermal or papulae, peristominal gills, genital bursae.
*excretory organ- excretion through diffusion
*nervous system-it consists of nerve ring
*sexes and fertilization-generally sexes are separate,fertilization is external
*development- indirect.
*body form-unsegmented, star shaped, spherical or cylindrical.
*spine and pedicellariae- many echinoderm bear spine pincer like pedicellariae.
*symmetry-bilateral in larvae and pentamerous in adults.
*germ layer-triploblastic
*level of organisation-organ system level
*body wall-epidermis is single layered and ciliated
*body cavity-enterocoelic coelom
*ambulacral system( water vascular system)-presence of ambulacral system is the characteristic feature of phylum echinodermata.
*digestive tract-incomplete digestive tract
*respiratory organ-dermal or papulae, peristominal gills, genital bursae.
*excretory organ- excretion through diffusion
*nervous system-it consists of nerve ring
*sexes and fertilization-generally sexes are separate,fertilization is external
*development- indirect.
*classification-
- Asteroidea-Asterias
- Ophiuroidea-Ophiothrix
- Echinoidea-Echinus
- Holothuroidea-Cucumaria
- Crinoidea-Antedon
No comments:
Post a Comment