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Perisphinctes (Kranaosphinctes) irregularis
Taxonomy
Pachyplanulites irregularis was named by Spath (1931). It is not extant.
It was recombined as Kranaosphinctes (Pachyplanulites) irregularis by Collignon (1959); it was recombined as Perisphinctes (Kranaosphinctes) irregularis by Pandey et al. (2013).
It was recombined as Kranaosphinctes (Pachyplanulites) irregularis by Collignon (1959); it was recombined as Perisphinctes (Kranaosphinctes) irregularis by Pandey et al. (2013).
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 irregularis Spath p. 433 figs. Pl. 95, fig. 8a, b. |
| 1959 | Kranaosphinctes (Pachyplanulites) irregularis Collignon p. 89 fig. 354 |
| 2013 | Perisphinctes (Kranaosphinctes) irregularis Pandey et al. p. 148 |
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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) irregularis Spath 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2013 | Phragmocones incomplete, depressed, evolute with rounded whorl section, maximum thickness at one-third of lateral height. Ornamentation consists of sharp, moderately coarse primary ribs in inner whorls, originating from the umbilical suture rursiradiately then bending slightly prorsiradiately and branching relatively high at the ventrolateral edge into two secondaries of similar thickness, which cross the venter with slight forward-directed sinuosity. Single primaries and gallops common. Occasionally, one primary rib is bifurcating in the middle of the venter (Fig. 8C). Constrictions deep, forwardly inclined, three to four per whorl. Primary ribs adjacent to these constrictions show a characteristic branching pattern: They bifurcate near the centre of the flank with the anterior secondary rib then branch again slightly above the ventrolateral shoulder (Fig. 8B-D). |
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 Early/Lower Kimmeridgian or 161.20000 to 150.80000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Callovian - Oxfordian | India | Perisphinctes irregularis (68644) | |
| Oxfordian | Madagascar | Pachyplanulites irregularis (98192) | |
| Late/Upper Oxfordian | Madagascar (Atsimo-Andrefana) | Kranaosphinctes irregularis (234266) Kranaosphinctes rabei (234264) | |
| Early/Lower Kimmeridgian | Madagascar (Mahajanga) | Pachyplanulites irregularis (234290) | |
| Early/Lower Kimmeridgian | Madagascar | Pachyplanulites irregularis (234281) |