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Perisphinctes (Dichotomoceras) stenocycloides
Taxonomy
Perisphinctes stenocycloides was named by Siemiradzki (1898).
It was recombined as Dichotomosphinctes stenocycloides by Collignon (1959); it was recombined as Perisphinctes (Dichotomoceras) stenocycloides by Pandey et al. (2012).
It was recombined as Dichotomosphinctes stenocycloides by Collignon (1959); it was recombined as Perisphinctes (Dichotomoceras) stenocycloides by Pandey et al. (2012).
Sister species lacking formal opinion data
Dichotomoceras cliqueti, Dichotomoceras quadratum, Dichotomoceras rabenjanaharyi, Dichotomoceras umbilicatum, 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 |
|---|---|
| 1898 | Perisphinctes stenocycloides Siemiradzki p. 254 figs. Pl. 20, fig. 11 |
| 1959 | Dichotomosphinctes stenocycloides Collignon pp. Pl. 65 fig. 291 |
| 2012 | Perisphinctes (Dichotomoceras) stenocycloides Pandey et al. p. 525 |
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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 (Dichotomoceras) stenocycloides Siemiradzki 1898
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shells moderately large, evolute, compressed. Whorl section suboval with slightly arched lanks merging smoothly into well rounded venter (Fig. 60A-C). Umbilical wall short but distinct, merging with lank at the rounded umbilical margin. Ornamentation consists of prorsiradiate, gradually varicostate, ine to moderately coarse primary ribs originating at the umbilical suture, branching into two secondaries slightly below the ventrolateral region (Fig. 60D, E). Secondaries cross the venter with slight forward-directed convexity. The anterior secondaries show a slightly stronger forward inclination than primaries. Occasionally, secondaries of one primary rib are connected with two adjacent primaries on the other side (“galloping”). Ribbing density is moderate, increasing considerably from diameters of 60 to 120 mm (Fig. 61). |
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 (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Oxfordian | Madagascar | Dichotomoceras stenocycloides (98190) | |
| Late/Upper Oxfordian | France | Dichotomoceras stenocycloides (62725) | |
| Late/Upper Oxfordian | Madagascar (Atsimo-Andrefana) | Dichotomosphinctes stenocycloides (234262) | |
| Middle Oxfordian | Germany | Perisphinctes stenocycloides (62306) | |
| Middle Oxfordian | France | Dichotomoceras stenocycloides (62715) |