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Perisphinctes (Dichotomosphinctes) jacki
Taxonomy
Otosphinctes jacki was named by Spath (1931).
It was recombined as Perisphinctes (Dichotomosphinctes) jacki by Pandey et al. (2012).
It was recombined as Perisphinctes (Dichotomosphinctes) jacki 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 jacki Spath p. 414 figs. Pl. 70, figs. 2a, b, 4, pl. 73, ig. 6, pl. 74, fig. 4a, b |
| 2012 | Perisphinctes (Dichotomosphinctes) jacki Pandey et al. p. 511 |
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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) jacki 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, depressed innermost whorls to compressed outer whorls. Whorl section subquadrangular with nearly lat lanks to oval (Fig. 39A-D). Maximum thickness at about one-fourth of whorl height, lanks grade smoothly into the moderately arched venter. Umbilical wall short, moderately distinct. Ornamentation consists of isocostate, prorsiradiate, sharp primary ribs originating near the umbilical suture with rectiradiate orientation then turning prorsiradiate near the umbilical margin. Primaries branch regularly into two slightly iner secondaries at the ventrolateral region (Fig. 39E). Occasionally undivided primaries occur. Commonly, secondaries of a primary rib are connected to two adjacent primary ribs on the other side (“galloping”). Secondaries cross the venter with slight forward-directed convexity. Ribbing density is moderate, increasing continuously from diameters of 40 to about 90 mm (Fig. 40). Constrictions distinct, numbering two to three per whorl. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Callovian - Oxfordian | India | Perisphinctes jacki (68644 68647) |