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Perisphinctes (Dichotomoceras) sparsicostatum
Taxonomy
Dichotomoceras sparsicostatum was named by Collignon (1959). It is a 3D body fossil. Its type locality is Bedoa (Befandriana Sud), which is in an Oxfordian marine limestone in Madagascar.
It was recombined as Perisphinctes (Dichotomoceras) sparsicostatum by Pandey et al. (2012).
It was recombined as Perisphinctes (Dichotomoceras) sparsicostatum 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 |
|---|---|
| 1959 | Dichotomoceras sparsicostatum Collignon p. 66 fig. 294 |
| 2012 | Perisphinctes (Dichotomoceras) sparsicostatum Pandey et al. p. 524 |
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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) sparsicostatum Collignon 1959
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shells small, evolute, incomplete, depressed. Whorl section subquadrangular with distinctly arched lanks and venter (Fig. 58A-E). Ornamentation consists of gradually varicostate, ine to coarse primary ribs, which originate slightly rursiradiate at the umbilical margin, turning prorsiradiate on the lanks and branch into two secondaries at the ventrolateral shoulder (Fig. 58G, H). Occasionally small tubercles are developed at the points of bifurcation. Secondaries cross the venter with slight forward-directed convexity. Occasionally, a single, undivided primary rib runs without branching along moderately deep constrictions. Ribbing density is low, increasing slightly from diameters of 30 to about 80 mm (Fig. 59). Commonly, secondaries of one primary rib are connected with two adjacent primary ribs on the other side (“galloping”). |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Late/Upper Oxfordian to the top of the Oxfordian or 161.20000 to 157.30000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Oxfordian | Madagascar | Dichotomoceras sparsicostatum (98190) | |
| Late/Upper Oxfordian | Madagascar (Atsimo-Andrefana) | Dichotomoceras sparsicostatum (234262) |