PBDB Taxon

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

Placenticeras bidorsatum

Cephalopoda - Ammonitida - Placenticeratidae

Taxonomy

Ammonites bidorsatus was named by Roemer (1841).

It was recombined as Placenticeras bidorsatum by Kennedy (1986), Kennedy and Kaplan (1995).

Sister species lacking formal opinion data

P. meeki

Synonyms

Ammonites dujardin was named by Schluter (1867).

It was synonymized subjectively with Placenticeras bidorsatum by Kennedy and Kaplan (1995).
Diplacomoceras canaliculatum was named by Hyatt (1903).

It was synonymized subjectively with Placenticeras bidorsatum by Kennedy and Kaplan (1995).

Synonymy list

Year	Name and author
1841	Ammonites bidorsatus Roemer p. 88 figs. Pl 13, fig 5
1867	Ammonites dujardin Schluter p. 25 figs. Pl 4, figs 1,2
1903	Diplacomoceras canaliculatum Hyatt p. 243
1986	Placenticeras bidorsatum Kennedy p. 56 figs. Pl 8, figs 1-12; pl 14, figs 8,9; text-figs 20-23
1995	Placenticeras bidorsatum Kennedy and Kaplan p. 28 figs. Pl 13, figs 1-3; pl 14, figs 1-3; pl 15, figs 1-5; pl 16, figs 1-5; pl 17, figs 1-3; pl 18, figs 1-3

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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	Haeckel 1866
suborder	Ammonitina	Hyatt 1889
superfamily	Hoplitoidea	(Douvillé 1890)
family	Placenticeratidae
genus	Placenticeras	Meek 1876
species	bidorsatum	(Roemer 1841)

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.

†Placenticeras bidorsatum Roemer 1841

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Invalid names: Ammonites dujardin Schluter 1867 [synonym], Diplacomoceras canaliculatum Hyatt 1903 [synonym]

Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
shell height	4	45.3	37.0	71.2	40.0	16.2
shell diameter	4	89.2	73.2	140.0	78.8	31.8
shell inflation	4	13.3	11.0	20.2	11.8	4.35

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: Late/Upper Campanian or 83.60000 to 72.20000 Ma

Collections (14 total)

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Campanian	83.6 - 72.2	Germany	Placenticeras bidorsatum (165367 165374 165375 165376 165377 165378)
Early/Lower Campanian	83.6 - 72.2	France	Placenticeras bidorsatum (165845 165846 165847 165848 165849 165850)
Early/Lower Campanian	83.6 - 72.2	Germany (Westfalen)	Ammonites bidorsatus (165365)
Late/Upper Campanian	83.6 - 72.2	France	Placenticeras bidorsatum (165841)