PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Perisphinctes (Arisphinctes) polymorphus

Cephalopoda - Ammonitida - Perisphinctidae

Taxonomy

Alligaticeras polymorphum was named by Spath (1931).

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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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Cephalopoda	Cuvier 1797
subclass	Ammonoidea	()

Rank	Name	Author
order	Ammonitida
suborder	Ammonitina	Hyatt 1889
superfamily	Perisphinctoidea	(Steinman 1890)
family	Perisphinctidae	Steinmann 1890
subfamily	Perisphinctinae	Steinmann 1890
genus	Perisphinctes	()
subgenus	Arisphinctes	(Buckman 1924)
species	polymorphus	(Spath 1931)

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

Measurements

No measurements are available

Composition:

aragoniteo

Environment:

marinec

Locomotion:

fast-movingo

Life habit:

nektonico

Diet:

carnivoreo

Vision:

well-developedc

Created:

2005-01-28 02:27:03

Modified:

2009-10-08 14:14:55

Source: o = order, c = class

References: Kiessling 2003, Kiessling 2004

Age range: Oxfordian or 163.50000 to 157.30000 Ma

Collections (6 total)

Time interval	Ma	Country or state	Original ID and collection number
Callovian - Oxfordian	166.1 - 157.3	India	Alligaticeras polymorphum (68644 68647)
Late/Upper Callovian	164.7 - 161.2	Madagascar	Alligaticeras polymorphum (98180)
Oxfordian	163.5 - 157.3	Madagascar	Alligaticeras polymorphum (98213)
Late/Upper Oxfordian	161.2 - 155.7	Madagascar (Atsimo-Andrefana)	Alligaticeras polymorphum (234149 234238)