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Antarctica
2
Atlantic Ocean
2
Atlantic Ocean (Southwest)
2
Caenogastropoda
2
Gastropoda
2
Invertebrata
2
Mollusca
2
Onoba
2
Rissoidae
2
Rissooidea
2
Scotia Arc
2
Southern Ocean
2
Southwestern Atlantic
2
Tierra del Fuego [(ISG) South America]
2
geographical distribution
2
intraspecific variation
2
invertebrate
2
marine environment
2
mollusc
2
morphology
new record
2
new species
2
shell
2
snail
2
species diversity
2
tooth
2
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