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Megalocypraea thomasi
Taxonomy
Gisortia thomasi was named by Olsson (1930). It is a 3D body fossil. Its type locality is Cabo Blanco, banks of Que Siches, which is in a Lutetian coastal sandstone in the Pale Greda Formation of Peru.
It was recombined as Megalocypraea thomasi by Woodring (1982).
It was recombined as Megalocypraea thomasi by Woodring (1982).
Synonymy list
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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.
†Megalocypraea thomasi Olsson 1930
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. A. Olsson 1930 | Shell large, very heavy, ovoid-pyramidal with a strongly flattened ventral surface and a high central dorsal hump ; the spire is entirely concealed in the adult by callus, this region of the shell is flattened but locally depressed immediately over the spire and on the right and left sides of the posterior canal ; when viewed from below, the outline of the base appears broadly elliptical with the right margin more strongly curved or convex than the left, and with the anterior end narrowed, pointed while the posterior r/4th is quite broad ; the right side is not angled as in G. tuberculosa and instead carries a broad depression which extends feebly upward onto the dorsal surface ; aperture narrow and not much wider at the anterior end ; viewed from above, the dorsal surface is pear-shaped with a high, central and very prominent hump ; the posterior-dorsal area is flattened, locally impressed, rounding on the sides ; the dorsal hump is very high, narrow, prominent and exactly central in position ; there is a broad depressed band on each side beginning on the ventral surface and extending upward onto the dorsal ; the one on the right is much wider and is partly responsible in the development of a pronounced marginal ridge on the posterior dorsal-ventral margin ; this depression extends but a short distance onto the dorsal surface so that the left side of the shell in this region is strongly convex ; the left depressed band is narrower but continues quite to the base of the dorsal hump ; posterior canal is very deep, ridged on the sides ; anterior canal about a quarter as deep as the posterior and curved to the left ; columella, inner and outer lip concealed. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||