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Perisphinctes (Dichotomoceras) besairiei
Taxonomy
Divisosphinctes besairiei was named by Collignon (1959). It is a 3D body fossil. Its type locality is Antrobika (Sakaraha), which is in an Oxfordian marine marl in Madagascar.
It was recombined as Perisphinctes (Dichotomoceras) besairiei by Pandey et al. (2012).
It was recombined as Perisphinctes (Dichotomoceras) besairiei 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 | Divisosphinctes besairiei Collignon p. 88 fig. 350 |
| 2012 | Perisphinctes (Dichotomoceras) besairiei Pandey et al. p. 521 |
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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) besairiei Collignon 1959
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | This is a distorted fragment of a small, evolute shell with a compressed whorl section. The ornamentation consists of sharp, thin, prorsiradiate primary ribs bifurcating just below the ventrolateral region. Secondaries cross the venter with forward-directed convexity. The outer whorl most likely represents part of the body whorl as no suture line has been observed. Shallow constrictions present. The ornamentation of the shell matches well the species described by Collignon (1959b), but owing to the poor state of preservation, the present specimen has been assigned to the species only tentatively. enay (1966) considered Divisosphinctes Beurlen as a junior synonym of Dichotomoceras, a view followed in the present study. The species is also similar to Perisphinctes (Dichotomoceras) dichotomoides Arkell and P. (D.) bifurcatus (QuenStedt) (compare rib curves in enay, 1966, textig. 157). |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Late/Upper Oxfordian or 161.20000 to 155.70000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oxfordian | Madagascar (Atsimo-Andrefana) | Divisosphinctes besairiei (234266) |