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Perisphinctes (Kranaosphinctes) nerunaensis
Taxonomy
Pachyplanulites nerunaensis was named by Spath (1931). It is not extant.
It was recombined as Perisphinctes (Kranaosphinctes) nerunaensis by Pandey et al. (2012).
It was recombined as Perisphinctes (Kranaosphinctes) nerunaensis by Pandey et al. (2012).
Sister species lacking formal opinion data
Kranaosphinctes subbullingdonensis, Kranaosphinctes poissoni, Kranaosphinctes randrianarivonyi, 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 | Pachyplanulites nerunaensis Spath p. 430 figs. Pl. 96, fig. 5. |
| 2012 | Perisphinctes (Kranaosphinctes) nerunaensis Pandey et al. p. 491 |
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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 (Kranaosphinctes) nerunaensis Spath 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shells small to moderately large, incomplete, septate till end, evolute, inner whorls depressed, outer whorls becoming less depressed. Whorl section subquadrangular, lanks slightly convex (inner whorls) to lat, merging into slightly arched venter (Fig. 9A-F). Umbilical wall indistinct. Ornamentation consists of very gradually varicostate, moderately coarse, sharp, and moderately spaced primary ribs, originating near the umbilical suture with rursiradiate orientation then turn prorsiradiate near the umbilical margin. Primaries branch regularly into two iner secondaries at the ventrolateral shoulder and cross the venter with slight forward-directed convexity (Fig. 9H, I). Ribbing density is moderate, increasing during growth before a plateau is reached at a diameter of 90 mm with about 49 ribs per whorl (Fig. 10). Venter smooth on outer whorl. Constrictions deep, slightly inclined, numbering at least two per whorl. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Late/Upper Oxfordian to the top of the Oxfordian or 161.20000 to 157.30000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Callovian - Oxfordian | India | Perisphinctes nerunaensis (68644) | |
| Oxfordian | Madagascar | Pachyplanulites nerunaensis (98213) | |
| Late/Upper Oxfordian | Madagascar (Atsimo-Andrefana) | Kranaosphinctes nerunaensis (234238) |