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Xianfengella

Helcionelloida - Helcionellida - Rugaeconidae

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 Mollusca by Sepkoski (2002); to Trenellidae by Parkhaev (2002); and to Rugaeconidae by Parkhaev and Demidenko (2010).

Synonyms
Synonymy list
YearName and author
1982Xianfengella He and Yang
1990Obscurella Vassiljeva
1990Rugaeconus Vassiljeva
2002Xianfengella Parkhaev p. 35
2002Scutatestomaconus Sepkoski, Jr.
2002Xianfengella Sepkoski, Jr.
2010Xianfengella Parkhaev and Demidenko pp. 1058, 1059

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
RankNameAuthor
phylumMollusca
classHelcionelloidaPeel 1991
orderHelcionellida
superfamilyYochelcionelloidea
familyRugaeconidaeVassiljeva 1990
genusXianfengella

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
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."