|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Gastropoda - Patellogastropoda - Nacellidae
It was assigned to Nacellidae by Lindberg and Hickman (1986); to Patellidae by Ladd (1966), Kensley (1972), Short and Potter (1987) and Wilson (1993); and to Patellogastropoda by Sepkoski (2002).
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.
|D. R. Lindberg and C. S. Hickman 1986||Shell conical, apex position central to anterior. Shell structure of five layers including myostracum; exterior layer (M+3) complex prismatic followed by foliated layer (M+2), radial crossed-lamellar layer (M+1), myostracum (M), and radial and/or complex crossed-lamellar layer (M- 1) (ventral portion of M+1 layer sometimes modified to irregularly tabulate foliated).|