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Aspidotheca schrieli
Taxonomy
Aspidotheca schrieli was named by Dahmer (1936). It is a 3D body fossil. Its type locality is Unkelmühle bei Eitorf. Rhein-Sieg-Kreis, which is in a Siegen marine shale in the Siegenen Schicten Formation of Germany.
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Aspidotheca schrieli Teichert |
| 1936 | Aspidotheca schrieli Dahmer figs. pl. 3 f. 3 |
| 1941 | Aspidotheca schrieli Knight p. 46 figs. Plate 15, figures 2a-d |
| 1960 | Aspidotheca schrieli Knight et al. p. 182 figs. f. 100.1 |
| 2023 | Aspidotheca schrieli Wagner p. 3645 |
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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.
†Aspidotheca schrieli Dahmer 1936
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Explanate, spiral gastropods with a minute, coiled spire, widely explanate aperture, a median carina, two rounded pleural ridges, and an internal, Crepidula-like plate; dorsal whorl surface with a moderately high median carina bearing an obscure selenizone and, separated from it by rounded grooves a rounded ridge on each side; spire seemingly minute and making a depression in the flaring posterior lip ; aperture flaring widely all around, a shallow sinus in the anterior margin culminating at the median dorsal ridge in a seemingly shallow notch which generates the selenizone; selenizone bordered by fine, regular lirae; well within the aperture and arising from the inner lip just below the spire a tri-partite Crepidula-like plate the three divisions of which are separated by low subangular ridges on its upper (inner) face beneath the rounded ridges on the surface of the shell, the median division with a salient angle in front and a wide troughlike depression on its upper (inner) side with a narrow, low, but sharp ridge in the middle, the lateral divisions with gently and obliquely convex anterior margins and very gently concave upper (inner) surfaces, their outer lateral edges making contact with the shell well within the flaring margins of the shell, the three parts of this plate with well-marked lines of growth; external ornamentation lines of growth only; the shell thin, its structure unknown. A large paratype measures about 65 mm. from the anterior to the posterior margin of the aperture and about 50 mm. from lateral margin to lateral margin. |