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Calveriosoma hystrix
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Order:	Echinothurioida
Family:	Echinothuriidae
Genus:	Calveriosoma
Species:	C. hystrix
Binomial name
	Calveriosoma hystrix; (Thomson, 1872)

Calveriosoma hystrix is a species of sea urchin of the family Echinothuriidae. Their armour is covered with spines. Calveriosoma hystrix was first scientifically described in 1872 by Thomson.^[1] C. hystrix has a structure known as a siphon, which is a thin tube that runs parallel to the stomach. While its function is not certain, it likely serves a way of moving water from the esophagus to the beginning of the intestine.^[2]

References

^ Kroh, A. (2010). Calveriosoma hystrix (Thomson, 1872). In: Kroh, A. & Mooi, R. (2010) World Echinoidea Database. at the World Register of Marine Species.
^ Holland, Nicholas D.; Ghiselin, Michael T. (2008). "Siphons and siphonal grooves in the digestive systems of the Echinoidea (Echinodermata)". Zoomorphology. 127 (4): 259–264. doi:10.1007/s00435-008-0071-7. ISSN 0720-213X.

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[1] Kroh, A. (2010). Calveriosoma hystrix (Thomson, 1872). In: Kroh, A. & Mooi, R. (2010) World Echinoidea Database. at the World Register of Marine Species.

[2] Holland, Nicholas D.; Ghiselin, Michael T. (2008). "Siphons and siphonal grooves in the digestive systems of the Echinoidea (Echinodermata)". Zoomorphology. 127 (4): 259–264. doi:10.1007/s00435-008-0071-7. ISSN 0720-213X.

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