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Truncatoconus

Helcionelloida - Helcionellida - Helcionellidae

Taxonomy
Truncatoconus was named by Yü (1979). It is not extant. Its type is Truncatoconus yichangensis.

It was assigned to Mollusca by Yü (1979); and to Helcionellinae by Parkhaev and Demidenko (2010).

Synonyms
Synonymy list
YearName and author
1979Truncatoconus
2002Maishucunconus Sepkoski, Jr.
2010Truncatoconus Parkhaev and Demidenko p. 1008

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

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"Cap-shaped low conical shell with subcentral blunt apex and oval or elliptic aperture. Posterior apertural margin cut by wide and shallow sinus. Ornamentation absent or represented by indistinct concentric folds."