Sea Urchins
Euechinoidea
Animalia
COMMON
Stats
- Lifespan
- Decades
- Size
- Small
- Diet
- Herbivore
- Activity
- Nocturnal
- Social
- Solitary
- Biome
- Ocean
- Range
- Worldwide oceans
- Movement
- Crawling
- Breeding
- Egg-laying
- Defense
- Spines
- Status
- Common
About
The subclass holding almost every living sea urchin — the spiny, globe-shaped grazers that creep over reefs and rocks on tube feet, scraping algae with a five-toothed jaw called Aristotle's lantern. It also includes their flattened relatives, the sand dollars and heart urchins that burrow through seafloor sediment.
Life cycle
- 1.juvenileA juvenile urchin settles onto the seafloor and begins grazing algae with its tiny test and spines.
- 2.adultFully grown, with adult test size and full spines.
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Taxonomy
- Kingdom
- Animalia
- Phylum
- Echinodermata
- Class
- Echinoidea