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Hemitoma (Montfortia) cantonensis
Taxonomy
Hemitoma (Montfortia) cantonensis was named by Squires (1987). Its type specimen is LACMIP 7440 and is a 3D body fossil. Its type locality is CSUN loc. 358. On west side of Canton Canyon, which is in a Ypresian carbonate sandstone in the Juncal Formation of California.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Hemitoma (Montfortia) cantonensis Squires p. 21 figs. Figures I0, 11 |
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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.
†Hemitoma (Montfortia) cantonensis Squires 1987
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires 1987 | Generic assignment based on high-profile open-conical shell with a distinct internal groove on anterior slope. Subgeneric assignment is based on the prominent thin costa formed by selenizone, anterior slope convex with small notch at anterior margin, and posterior slope concave behind apex. Specific assignment based on the apex moderately inclined posteriorly , thin costa on anterior slope slightly left of the shell midline, and sculpture of radial ribs (at least in posterior region).
Hemitoma (Montfortia) cantonensis new species is similar to Hemitoma [=Subemarginula] fenestrata (Deshayes, 1864: 350, pl. 3, figs. 37-41 ; Cossmann and Pissarro, 1910-1913: pl. 2 , fig. 10-1) from middle Eocene strata (Lutetian and Bartonian stages) of the Paris Basin, France (Chedeville, 1902: 244). Hemitoma (M.) cantonensis differs from H . fenestrata in the following features: apex higher and not as strongly inclined posteriorly. In addition, there is no evidence of any commarginal ribs on H. (M.) cantonensis. |
Measurements
No measurements are available
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| Source: f = family, superf = superfamily, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||