PBDB Taxon

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

Acanthoceras amphibolum

Cephalopoda - Ammonitida - Acanthoceratidae

Taxonomy

Acanthoceras amphibolum was named by Morrow (1935).

It was recombined as Cunningtoniceras amphibolum by Cobban (1987).

Subspecies

Cunningtoniceras amphibolum fallense

Sister species lacking formal opinion data

A. quadratum

Synonyms

Acanthoceras hazzardi was named by Stephenson (1952).

It was synonymized subjectively with Acanthoceras amphibolum by Zaborski (1985) and Kennedy et al. (1988).
Acanthoceras alvaradoense was named by Moreman (1942).

It was recombined as Euomphaloceras alvaradoense by Stephenson (1955); it was synonymized subjectively with Acanthoceras amphibolum by Kennedy et al. (1988).

Synonymy list

Year	Name and author
1935	Acanthoceras amphibolum Morrow p. 470 figs. Pl 49, figs 1-4,6; pl 51, figs 3,4
1942	Acanthoceras alvaradoense Moreman p. 205 figs. Pl 32, fig 6; text-figs 2o,t
1952	Acanthoceras hazzardi Stephenson p. 201 figs. Pl 48, figs 1,2; pl 49, fig 4
1955	Euomphaloceras alvaradoense Stephenson p. 63 figs. pl. 7, figs. 1-9
1985	Acanthoceras amphibolum Zaborski p. 35 figs. 38-41
1987	Cunningtoniceras amphibolum Cobban p. 9 figs. pls 4–8; text-figs 48–63
1988	Acanthoceras amphibolum Kennedy et al. p. 38 figs. 1w-z,cc-ff, 2a,b
2007	Acanthoceras amphibolum Hook and Cobban p. 94 fig. 14B
2020	Acanthoceras amphibolum Kennedy p. 211 figs. Pl. 27

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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	Acanthoceratoidea	(de Grossouvre 1894)
family	Acanthoceratidae	Grossouvre 1894
subfamily	Acanthoceratinae	de Groussouvre 1894
genus	Acanthoceras
species	amphibolum	Morrow 1935

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.

†Acanthoceras amphibolum Morrow 1935

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Invalid names: Acanthoceras alvaradoense Moreman 1942 [synonym], Acanthoceras hazzardi Stephenson 1952 [synonym]

†Cunningtoniceras amphibolum fallense Cobban 1987

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Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
shell height	5	42.9	24.5	70.0	51.0	20.0
shell diameter	5	118.2	63.5	215.0	135.0	64.1
shell inflation	5	44.9	21.2	90.0	56.0	29.5

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 Cenomanian to the top of the Cenomanian or 99.60000 to 93.90000 Ma

Collections (21 total)

Time interval	Ma	Country or state	Original ID and collection number
Cenomanian	100.5 - 93.9	USA (New Mexico)	Acanthoceras amphibolum (10180)
Cenomanian	100.5 - 93.9	USA (Texas)	Acanthoceras hazzardi (6485 6492 6568 6569) Euomphaloceras alvaradoense (2120 2122 2123 2125 231936)
Late/Upper Cenomanian	99.6 - 93.5	USA (New Mexico)	Acanthoceras amphibolum (176967)
Middle Cenomanian	99.6 - 93.5	Egypt	Acanthoceras amphibolum (151581 151603)
Middle Cenomanian	99.6 - 93.5	USA (New Mexico)	Acanthoceras amphibolum (178790 178835 178838)
Middle Cenomanian	99.6 - 93.5	Nigeria	Acanthoceras amphibolum (69629)
Middle Cenomanian	99.6 - 93.5	USA (South Dakota)	Cunningtoniceras fallense (232640)
Middle Cenomanian	99.6 - 93.5	USA (Wyoming)	Acanthoceras amphibolum, Acanthoceras alvaradoense, Cunningtoniceras amphibolum (231777) Acanthoceras amphibolum, Cunningtoniceras fallense (231776) Cunningtoniceras amphibolum (177081)