Retusa obtusa

Retusa obtusa, common name the "Arctic barrel-bubble", is a species of very small head-shield sea snail or bubble shell, a marine gastropod mollusk in the family Retusidae.[1]

Retusa obtusa
A shell of Retusa obtusa
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia

clade Euthyneura
clade Euopisthobranchia

clade Cephalaspidea
Superfamily:
Philinoidea
Family:
Retusidae
Genus:
Retusa
Species:
R. obtusa
Binomial name
Retusa obtusa
(Montagu, 1803)

This species occurs widely in the northern parts of the Atlantic Ocean, occurring in both the Eastern Atlantic and Western Atlantic. It has also been reported from North Carolina, and from Alaska in the Pacific Ocean. The shell reaches a maximum size of 3 mm.[1]

References
  1. Gofas, S. (2013). Retusa obtusa (Montagu, 1803). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141134 on 2014-03-30
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