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Asperconella
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 Helcionelloida by Sepkoski (2002); and to Helcionellidae by Landing and Bartowski (1996), Parkhaev (2002).
It was assigned to Helcionelloida by Sepkoski (2002); and to Helcionellidae by Landing and Bartowski (1996), Parkhaev (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Asperconella Landing and Bartowski |
| 2002 | Asperconella Parkhaev p. 35 |
| 2002 | Asperconella Sepkoski |
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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.
G. †Asperconella Landing and Bartowski 1996
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†Asperconella gloriae Landing and Bartowski 1997
†Asperconella troyensis Resser 1938
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. Landing and K.E. Bartowski 1996 | Micromollusks 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. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy 2009, Hendy et al. 2009 | |||||
Age range: Dyeran or 515.30000 to 509.70000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Dyeran | USA (New York) | A. troyensis (78762 78763 78764 78765 78767 171821) | |
| Dyeran | Greenland | A. troyensis (49461) | |
| Dyeran | Canada (Quebec) | A. troyensis (78754) |