PBDB Taxon

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

Perisphinctes mahabobokensis

Cephalopoda - Ammonitida - Perisphinctidae

Taxonomy

Kranaosphinctes (Pachyplanulites) mahabobokensis was named by Collignon (1959). Its type specimen is UBGD.010361 and is a 3D body fossil. Its type locality is Lit de la Mahaboboka au Nord du Cirque de Marovohitra (Manera). , which is in an Oxfordian marine horizon in Madagascar.

It was recombined as Perisphinctes mahabobokensis by Pandey et al. (2013).

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
1959	Kranaosphinctes (Pachyplanulites) mahabobokensis Collignon pp. Pl. 92 fig. 361
2013	Perisphinctes mahabobokensis Pandey et al. p. 144

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

Rank	Name	Author
subclass	Ammonoidea	()
order	Ammonitida
suborder	Ammonitina	Hyatt 1889
superfamily	Perisphinctoidea	(Steinman 1890)
family	Perisphinctidae	Steinmann 1890
subfamily	Perisphinctinae	Steinmann 1890
genus	Perisphinctes	()
species	mahabobokensis	()

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 mahabobokensis Collignon 1959

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Diagnosis

Reference	Diagnosis
D.K. Pandey et al. 2013	Shells large, septate up to a diameter of 180 mm, evolute, depressed. Whorl section subcircular in inner whorls to subrectangular in outer whorls with short umbilical wall merging into the obtusely rounded umbilical edge. Flanks feebly arched to almost flat merging into venter along a smooth curve. Ornamentation consists of very gradually variocostate, sharp, moderately coarse to thick and distant ribs, which originate from the umbilical wall rursiradiately, bend forward with forward-directed concavity on the umbilical edge, branch into two, very rarely three (GZN2011I 038, 346) secondary ribs slightly below the ventrolateral region, and cross the venter with forward-directed sinuosity (in inner whorls) or straight (in outer whorls). Occasionally, single, undivided primary ribs are followed by a shallow to moderately deep constriction and gallop. Secondary ribs fade at the end of phragmocone, outermost whorl with smooth venter. Primary ribs on the body chamber with tubercles at the ventrolateral shoulder.

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 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	163.5 - 157.3	Madagascar	Pachyplanulites mahabobokensis (98192)
Late/Upper Oxfordian	161.2 - 155.7	Madagascar (Atsimo-Andrefana)	Kranaosphinctes mahabobokensis (234267)