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Absidaticonus
Taxonomy
Absidaticonus is a genus. It is not extant.
It was assigned to Mollusca by Sepkoski (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
It was assigned to Mollusca by Sepkoski (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1985 | Yangtzedonta Yu p. 403 |
| 2002 | Absidaticonus Sepkoski |
| 2010 | Absidaticonus Parkhaev and Demidenko p. 1035 |
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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. †Absidaticonus
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†Absidaticonus triangulatus Xing et al. 1984
Invalid names: Yangtzedonta Yu 1985 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Y. Parkhaev and Y. Demidenko 2010 | "Shell cap-shaped, low conical, elongated to different extent. Apex hooked downwards and displaced posteriorly, projecting over posterior apertural margin. Anterior field evenly convex, becomes gently convex near aperture. Posterior field very short, concave below apex, flattens towards aperture. Lateral fields moderately convex. Aperture irregularly oval or pyriform, its posterolateral flanks slightly pulled, forming small 'auricles'. Posterior apertural margin with subapical angulation. Exterior shell ornamentation represented by growth lines. Surface of internal mold smooth or with concentric wrinkles." |