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Centrifugus planorbis
Taxonomy
Centrifugus planorbis was named by Bronn (1835). It is not a trace fossil. It is the type species of Centrifugus, Hisingeria.
It was recombined as Inachus planorbis by Hisinger (1837); it was recombined as Pleurotomaria planorbis by Lindström (1884) and Manten (1971); it was recombined as Hisingeria planorbis by Ulrich and Scofield (1897).
It was recombined as Inachus planorbis by Hisinger (1837); it was recombined as Pleurotomaria planorbis by Lindström (1884) and Manten (1971); it was recombined as Hisingeria planorbis by Ulrich and Scofield (1897).
Synonymy list
| Year | Name and author |
|---|---|
| 1835 | Centrifugus planorbis Bronn p. 97 |
| 1837 | Inachus planorbis Hisinger p. 37 |
| 1884 | Pleurotomaria planorbis Lindström pp. 122 - 124 figs. pl. 19 f. 30-39 |
| 1897 | Hisingeria planorbis Ulrich and Scofield pp. 1028 - 1029 |
| 1941 | Centrifugus planorbis Knight pp. 72 - 73 figs. pl. 72 f. 1a-d |
| 1960 | Centrifugus planorbis Knight et al. p. 192 figs. f. 107.2a-b |
| 1971 | Pleurotomaria planorbis Manten |
| 1999 | Centrifugus planorbis Wagner |
| 2023 | Centrifugus planorbis Wagner p. 729 |
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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.
†Centrifugus planorbis Bronn 1835
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Rather large, discoidal, widely phaneromphalous gastropods with strong revolving ornamentation and a sharp, V-shaped sinus in the outer lip rather close to the suture giving rise to a selenizone; whorl profile strongly rounded on the upper and outer whorl faces above a prominent, projecting, flangelike keel extending horizontally in continuation with the base; sutures moderately deep; nucleus and earlier whorls largely unknown; base widely phaneromphalous, very gently arched on the lower surface, more strongly arched as it turns into the umbilicus; columellar lip seemingly thin; parietal lip very narrow, the whorls only in contact by virtue of two inwardly directed flanges that grip the outwardly directed revolving flange of the previous whorl; outer lip with a deep narrow notchlike sinus rather close to the upper suture, the sinus culminating in a short slit that gives rise to a selenizone, the margin of the lip leaving the upper suture with strong backward obliquity and forward convexity into the sinus, leaving the sinus with a similar forward obliquity which continues only slightly weakened to the revolving groove just above the flangelike extension of the base where it curves sharply backward to the crest of the flange, the flange itself bearing a channel on its apertural face, proceeding on the base at first almost radially for a short distance, then turning gradually to a strong backward obliquity across most of the base and again turning roundly at the umbilical shoulder to a gentle forward obliquity on the umbilical slope; ornamentation a series from 8 to 10 strong revolving costae on the upper and outer whorl faces between the selenizone and the peripheral flange, the costae having broad flat interspaces with occasional intercalated costae of less strength in the interspaces, the base and umbilical slopes either without revolving ornamentation or with a few low, rather obscure costae best developed at earlier growth stages, transverse ornamentation fine, sharp lines of growth only which cross all the costae except the flange without being drawn back or retroussé; selenizone bordered by revolving striae and with coarse, irregular lunulae; shell rather thin except on the thickened flange, and o f two distinct layers; earlier whorls abandoned and partitioned off by transverse septa which are concave forward. A large chorotype before me measures 64 mm. in greatest diameter. |