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Atresius

Gastropoda -

Taxonomy
Atresius was named by Gabb (1869) [Sepkoski's age data: K Apti T Than Sepkoski's reference number: 914].

It was assigned to Hipponicidae by Glibert (1963); to Neotaenioglossa by Sepkoski (2002); and to Caenogastropoda by Kiel et al. (2008).

Synonymy list
YearName and author
1869Atresius Gabb
1963Atresius Glibert p. 9
2002Atresius Sepkoski, Jr.
2008Atresius Kiel et al. p. 691

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
RankNameAuthor
phylumMollusca
classGastropodaCuvier 1797
subclassProsobranchiaMilne-Edwards 1848
superorderCaenogastropodaCox 1959
genusAtresiusGabb 1869

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
S. K. Kiel et al. 2008High−spired, littoriniform shell with five or more whorls and deeply incised suture; shell thin; whorls almost straight−sided, weakly convex, or with steep shoulder; sculpture of several spiral cords of subequal strength, interspaces mostly wider than spirals; basal margin rounded to strongly angular and keeled; spirals on base similar to those on whorl’s flank but finer and more narrowly spaced; umbilical slit may be present; growth lines opisthocyrt, fine, and numerous, occasionally clumped into ribs; aperture rhomboid, inner lip apparently smooth and without folds, short siphonal notch.