what are the typical features of echinoderms
Answers
(Echinos: Spines; derma: Skin)
Kingdom: Animalia
Habitat: These are exclusively marine
Grade of organization: organ system grade
Germ layer: triploblastic
Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.
Coelom: present ( coelomate)
Body without segmentation
The shape of the body is flat, star like, spherical or elongated.
Head is absent
Presence of tube feet
Presence of water vascular system
Mouth is present on ventral side while anus is present on dorsal side
Respiration: by papule, gills or clocal respiratory tree
Nervous system: absent, they are brainless organism.
Circulatory system: is reduced, heart is absent
Blood has no pigment.
Digestive system: complete
Excretory system: absent
Sexes: mostly dioecious, rarely monocious
Reproduction:
Sexual: by gamatic fusion
Asexual: regeneration
Fertilization: external
Development: indirect with characteristic larvae