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Xianfengella
Taxonomy
Xianfengella was named by He and Yang (1982) [Sepkoski's age data: Cm Tomm-l Cm Tomm-u Sepkoski's reference number: 951,1006,1030]. It is not extant.
It was assigned to Trenellidae by Parkhaev (2002); to Mollusca by Sepkoski (2002); and to Rugaeconidae by Parkhaev and Demidenko (2010).
It was assigned to Trenellidae by Parkhaev (2002); to Mollusca by Sepkoski (2002); and to Rugaeconidae by Parkhaev and Demidenko (2010).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1982 | Xianfengella He and Yang |
| 1990 | Obscurella Vassiljeva |
| 1990 | Rugaeconus Vassiljeva |
| 2002 | Xianfengella Parkhaev p. 35 |
| 2002 | Scutatestomaconus Sepkoski |
| 2002 | Xianfengella Sepkoski |
| 2010 | Xianfengella Parkhaev and Demidenko pp. 1058, 1059 |
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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. †Xianfengella He and Yang 1982
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†Xianfengella prima He and Yang 1982
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Invalid names: Scutatestomaconus latus Chen and Zhang 1980 [synonym]
†Xianfengella yatesi Parkhaev 2001
Invalid names: Obscurania Vassiljeva 1990 [synonym], Rugaeconus Vassiljeva 1990 [synonym], Scutatestomaconus [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Y. Parkhaev and Y. Demidenko 2010 | "Shell cap-shaped, low conical, longitudinally elongated, wide. Apex strongly displaced posteriorly and hooked downwards. Anterior field evenly convex, posterior field concave and sharply folded, so that wide flattened fold projects inside shell interior and divides it on main shell cavity and train space. Train very short, but wide and high. Exterior of shell smooth. Aperture varies from elongated (elliptical or pyriform) to circular. Posterior apertural margin cut by low and wide sinus." |