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Perisphinctes (Arisphinctes) polymorphus
Taxonomy
Alligaticeras polymorphum was named by Spath (1931).
It was recombined as Perisphinctes (Arisphinctes) polymorphus by Pandey et al. (2012).
It was recombined as Perisphinctes (Arisphinctes) polymorphus by Pandey et al. (2012).
Sister species lacking formal opinion data
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 | Alligaticeras polymorphum Spath p. 409 figs. Pl. 73, figs. 3a, b |
| 2012 | Perisphinctes (Arisphinctes) polymorphus Pandey et al. p. 504 figs. Pl. VIII, figs. 2-5; Figs. 27, 28; Tab. 15 |
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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 (Arisphinctes) polymorphus Spath 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shells small, septate till end, evolute, compressed. Whorl section subquadrangular with lat sides and narrowly rounded venter (Fig. 27AE), umbilical wall distinct but short and vertical. Ornamentation consists of gradually varicostate (ine in the inner whorls and moderately thick in the middle whorls) and sharp primary ribs beginning in a slightly rursiradiate fashion near the umbilical margin to turn prorsiradiately on the lanks. They branch regularly into two iner secondaries just short of the ventrolateral shoulder. The secondaries diminish towards the mid venter and exhibit a slight forward-directed convexity. Ribbing density is moderate, gradually increasing during growth (Fig. 28). Constrictions are shallow, numbering at least two per whorls |