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Perisphinctes (Dichotomoceras) antrobikensis
Taxonomy
Lithacoceras mombassanum antrobikensis was named by Collignon (1959). Its type specimen is UBGD.010359 and is a 3D body fossil.
It was recombined as Perisphinctes (Dichotomoceras) antrobikensis by Pandey et al. (2013).
It was recombined as Perisphinctes (Dichotomoceras) antrobikensis by Pandey et al. (2013).
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 | Lithacoceras mombassanum antrobikensis Collignon pp. Pl. XC fig. 359 |
| 2013 | Perisphinctes (Dichotomoceras) antrobikensis Pandey et al. p. 160 |
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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) antrobikensis Collignon 1959
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2013 | Shell incomplete with only parts of phragmocone and body chamber preserved (septation ceases between diameters of 65 to 85 mm), evolute, compressed. Whorl section squarish to suboval with low umbilical wall, moderately distinct umbilical edge, and slightly arched flanks merging smoothly into rounded venter. Ornamentation consists of long, prorsiradiate, straight primary ribs, originating rursiradiately at the umbilical suture and branching low, at around two-thirds of flank height. Occasionally, a single primary or free secondary rib crosses the venter and continues into a secondary rib on the other side of the shell. Generally, secondary ribs cross the venter with smooth forward-directed sinuosity. Constrictions rare, shallow, on outer whorl. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
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) | Lithacoceras mombassanum (234266) |