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Perisphinctes (Dichotomosphinctes) rotiformis
Taxonomy
Otosphinctes rotiformis was named by Spath (1931).
It was recombined as Perisphinctes (Dichotomosphinctes) rotiformis by Pandey et al. (2012).
It was recombined as Perisphinctes (Dichotomosphinctes) rotiformis by Pandey et al. (2012).
Sister species lacking formal opinion data
Dichotomosphinctes decaryi, Dichotomosphinctes martini, Dichotomosphinctes sikilyensis, P. africanus, P. andium, P. mairei-matheyi, P. malinowskae, P. panderi, P. polygyratus, P. praestenocyclus, P. progeron, P. quadratus, P. scythicus, P. siemiradzkii, P. eucostatus, P. quadratus, P. pickeringius, P. buckmani, P. buckmanni, P. luciaeformis, P. crassissimus, P. A, P. B, P. anguiculus, P. patturatensis, P. siemirazkii, P. roedereri, P. alatus, P. andelotensis, P. densecostatus, P. pumilus, P. dorsoplanus, P. dacquei, P. polygyratus
Synonymy list
| Year | Name and author |
|---|---|
| 1931 | Otosphinctes rotiformis Spath p. 412 figs. Pl. 73, fig. 1a, b, pl. 92, fig. 8. |
| 2012 | Perisphinctes (Dichotomosphinctes) rotiformis Pandey et al. p. 514 |
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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.
†Perisphinctes (Dichotomosphinctes) rotiformis Spath 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shell moderately large, incomplete, evolute, depressed (Fig. 43A). Whorl section subquadrangular (Fig. 43B) with arched lanks and maximum thickness at mid height. Flanks merge smoothly into a moderately arched venter. Ornamentation consists of isocostate, sharp, prorsiradiate, primary ribs which run across the lank with slight backward-directed convexity and branch into two secondaries at the ventrolateral region. Secondaries cross the venter with slight forward-directed convexity. Constrictions distinct. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Early/Lower Oxfordian or 161.20000 to 155.70000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Oxfordian | Madagascar (Atsimo-Andrefana) | Dichotomosphinctes rotiformis (234151) |