Taxonomy:
Class: Gastropoda Cuvier, 1797
Subclass: Heterobranchia J.E. Gray, 1840
Clade: Euthyneura Spengel, 1881
Clade: Euopisthobranchia Jörger et al., 2010
Clade: Cephalaspidea P. Fischer., 1883
Superfamily: Philinoidea J.E. Gray, 1850
Family: Aglajidae Pilsbry, 1895 (1847)
Genus: Navanax Pilsbry, 1895
Species: Navanax polyalphos (Gosliner & Williams, 1972) [Aglaja]
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formerly:
Class: GASTROPODA Cuvier, 1797
Subclass: OPISTHOBRANCHIA Milne-Edwards, 1848
Order: CEPHALASPIDEA Fischer, P., 1883
have a look at
Jörger, Stöger, Kano, Fukuda, Knebelsberger & Schrödl
(2010).
"On the origin of Acochlidia and other enigmatic euthyneuran gastropods,
with implications for the systematics of Heterobranchia".
BMC Evolutionary Biology 10: 323.
complete online at http://www.biomedcentral.com/1471-2148/10/323
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