Sea Urchin Animal
The Sea Urchin Animal Evechinus chloroticus is a regular (rounded) sea urchin with a mass of bristling spines and is found in rocky pools in New Zealand. Diameter 4 inches (10 cm). Chypeaster rosaceus, the brown sea biscuit, is very common around reefs in southern Florida, Globular Animals where it burrows just underneath the sand.
Diameter 4.5 inches (11 cm), Sea Urchin Animal or urchins are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, Sea Urchin Animal inhabiting all oceans and depth zones from the intertidal to 5,000 metres.
Sea Urchin Animal Facts:
Common name: Sea urchins sand dollars, heart urchins
Number of species: About 950
Size: 0.1 in (3 mm) to 7 in (17 cm)
Key features: Adult body round, disklike, Sea Urchin Animal or heart shaped, showing 5-sided symmetry, colors varied, often black, green, gray, or brown; head and brain lacking, 5 paired rows of tube feet bearing suckers at tips; calcareous skeleton set in body wall (the test); Sea Urchin Animal test is usually rigid and bears mobile spines and minute grooming organs (pedicellariae) that may be venomous; many species have chewing organ (Aristotle’s lantern) and teeth; long gut opens via mouth on underside and via anus on upper side of body
Habits: Adults bottom-dwelling marine animals; Sea Urchin Animal usually lie with mouth downward; move using tube feet, spines used for defense and for burrowing in some forms
Breeding: No mating behavior; sperm and eggs released into seawater, fertilization occurs outside the body, microscopic larvae generally planktonic; a few species brood their embryos
Diet: Sea Urchin Animal Algae, sea grasses, encrusting invertebrate animals, and organic detritus
Habitat: Exclusively marine, living on rocks and reefs or burrowing in sediment
Distribution: All the world’s seas and oceans at all depth