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Asperconella

Helcionelloida - Helcionellida - Helcionellidae

Taxonomy
Asperconella was named by Landing and Bartowski (1996) [Sepkoski's age data: Cm Boto-u Sepkoski's reference number: 1235]. It is not extant.

It was assigned to Helcionellidae by Landing and Bartowski (1996) and Parkhaev (2002); and to Helcionelloida by Sepkoski (2002).

Synonymy list
YearName and author
1996Asperconella Landing and Bartowski
2002Asperconella Parkhaev p. 35
2002Asperconella Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
RankNameAuthor
phylumMollusca
classHelcionelloidaPeel 1991
orderHelcionellida
superfamilyHelcionelloidea(Wenz 1938)
familyHelcionellidae
genusAsperconella

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
E. Landing and K.E. Bartowski 1996Micromollusks with rapidly expanding, bilaterally symmetrical, cyrtoconic conch with circular to elliptical cross-section and slightly flattened anterior margin; conch surface with transverse ridges and low nodes or short spines; visceral surface of conch with subtle, comarginal ridges.

Description.- Conch rapidly expanding, cyrtoconic, with overhanging apex, reaches at least 3 mm in length; cross section approximately circular apically and in small specimens but anteroposteriorly elongate ellipse in larger specimens; concave (anterior) margin slightly flattened and forms a low, ridge-like geniculation at transition into lateral margins of shell; conch surface characterized by low, nodose ridges that form transverse ornament; nodes and low spines are 10-15 pm-high; visceral surface relatively smooth with very low, subtle, comarginal ridges and radial ridge at right and left margins of surface-overhung by apex; muscle scars and morphologically distinct protoconch unknown.