© Greg GrimesCC BY-SA 4.0 · iNaturalist
Atlantic Long-spined Sea Urchin
Diadema antillarum
Cake Sand Dollar
Arachnoides placenta
- Found in
- 16 regions
How to recognise it
- Colours
- browngreyyellowpurplepink
- Pattern
- Blotches or dots
Arachnoides placenta is a species of sea urchin of the family Clypeasteridae.
Their armour is covered with spines. It is placed in the genus Arachnoides and lives in the sea. Arachnoides placenta was first scientifically described in 1758 by Carl Linnaeus.
Similar species
© Greg GrimesCC BY-SA 4.0 · iNaturalist 
© Bernard DUPONTCC BY 4.0 · iNaturalist
Banded Sea Urchin
Echinothrix calamaris
© Matt MuirCC BY 4.0 · iNaturalist
Black Longspine Urchin
Diadema setosum
© Ewout KnoesterCC BY-SA 4.0 · iNaturalist
Blue-spotted Urchin
Astropyga radiata
© Dominik Maximilián RamíkCC BY 4.0 · iNaturalist
Collector Urchin
Tripneustes gratilla
© Erin McKittrickCC BY 4.0 · iNaturalist
Common Sand Dollar
Echinarachnius parma
Questions
Is Cake Sand Dollar dangerous?
Cake Sand Dollar has no known danger to humans. However, always observe marine life responsibly.
