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Chedevillia stewarti

Gastropoda - Rostellariidae

Taxonomy
Chedvillia stewarti was named by Clark (1942). Its type specimen is U. C. loc. 7015, no. 34208, a shell, and it is a 3D body fossil. Its type locality is UCMP 7015. Santa Susana, which is in a Thanetian coastal siliciclastic in the Santa Susana Formation of California.

It was recombined as Chedevillia stewarti by Squires and Advocate (1986) and Savazzi (1988).

Synonymy list
YearName and author
1942Chedvillia stewarti Clark p. 117 figs. Plate 19, figures 7-11
1986Chedevillia stewarti Squires and Advocate p. 856
1988Chedevillia stewarti Savazzi p. 261

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
RankNameAuthor
classGastropodaCuvier 1797
superorderHypsogastropoda(Ponder and Lindberg 1997)
infraorderLittorinimorphaGolikov and Starobogtov 1975
superfamilyStromboidea(Rafinesque 1815)
familyRostellariidae(Gabb 1868)
genusChedevilliaCossmann 1906
speciesstewarti()

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
B. L. Clark 1942Shell medium in size, fusiform in outline, apex acute, with 9 or 10 gently convex whorls; sutures slightly appressed; surface sculptured by numerous fine, closely spaced spiral lines, also by a series of fine longitudinal ribs, which are more numerous and finer on the posterior whorls of the spire than on the penultimate and body whorls of the adult specimens; these ribs a short distance below the suture on the body whorl of the adult specimens stand out more prominently and might be described as elongate nodes. Aperture elongate ovate, somewhat constricted, lying in an oblique position to the axis of the shell. Outer lip bordered by a broad, somewhat irregular flange, which usually extends from the anterior end of the canal to the apex and, when fully developed, as shown on the holotype, may be bordered by a fairly heavy, broad, low ridge. The fine spiral lines of the whorl extend out onto the flange; on the inner side of the flange posterior to the body whorl, similar to that on the genus Rimella, is a narrow open posterior canal, which extends up to the apex. Inner lip covered by a callus, which is heavier near the anterior end. Anterior canal short, slightly twisted to the right. All of the specimens at hand are plaster casts of external molds made in the field.