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Heligmotoma (Douvilletoma)

Gastropoda - Neogastropoda - Melongenidae

Heligmotoma (Douvilletoma) was named by Adegoke (1977) [Sepkoski's age data: T Than Sepkoski's reference number: ZR77].

It was reranked as Douvilletoma by Sepkoski (2002).

It was assigned to Heligmotoma by Adegoke (1977); and to Neotaenioglossa by Sepkoski (2002).

Synonymy list
YearName and author
1977Heligmotoma (Douvilletoma) Adegoke pp. 171 - 172
2002Douvilletoma Sepkoski, Jr.

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EubilateriaAx 1987
classGastropodaCuvier 1797
subclassProsobranchiaMilne-Edwards 1848
superorderCaenogastropodaCox 1959
orderNeogastropodaThiele 1929
superfamilyBuccinoidea(Rafinesque 1815)
familyMelongenidaeGill 1867
subfamilyMelongeninae(Gill 1871)
genusHeligmotoma(Mayer-Eymar 1895)

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.

O. S. Adegoke 1977Small to medium Heligmotoma, with low spire of about three-four whorls which are only slightly elevated above the flattened apical surface. Body whorl large, enclosing much of the spire from which it is separated by a shallow groove in which the growth striae describe shallow sinuses. Apical shoulder of body whorl bounded by variably developed carina which may or may not be noded. Parietal surface bears two unequal, moderate to heavy, oblique ridges. Body whorl conspicuously constricted below the parietal surface. Columella narrow to heavy, bears one oblique plication of variable prominence. Aperture wide, hemispherical.