PBDB Taxon

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

Xenocephalites

Cephalopoda - Ammonitida - Sphaeroceratidae

Taxonomy

Xenocephalites is a genus. It is not extant. Its type is Macrocephalites neuquensis.

It was assigned to Macrocephalitidae by Imlay (1953), Arkell et al. (1957); to Ammonoidea by Sepkoski (2002); and to Eurycephalitinae by Arthur et al. (1993), Parent (1998), Poulton and Hall (2019).

Species

X. araucanus, X. bearpawensis, X. grantmackiei, X. hartsocki, X. neuquensis, X. nikitini, X. vicarius (syn. X. hebetus)

Species lacking formal opinion data

X. gottschei, X. stipanicici

Synonymy list

Year	Name and author
1953	Xenocephalites Imlay
1957	Xenocephalites Arkell et al. p. 294
1993	Xenocephalites Arthur et al. p. 38
1998	Xenocephalites Parent p. 118
2002	Xenocephalites Sepkoski
2019	Xenocephalites Poulton and Hall

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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	Stephanoceratoidea	(Newmayr 1875)
family	Sphaeroceratidae	Buckman 1920
subfamily	Eurycephalitinae	Thierry 1976
genus	Xenocephalites

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.

G. †Xenocephalites

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†Xenocephalites araucanus Burckhardt 1903

†Xenocephalites bearpawensis Imlay 1953

†Xenocephalites grantmackiei Westermann and Hudson 1991

†Xenocephalites hartsocki Imlay 1953

†Xenocephalites neuquensis Stehn 1923

†Xenocephalites nikitini Burckhardt 1927

†Xenocephalites vicarius Imlay 1953

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Invalid names: Xenocephalites hebetus Imlay 1953 [synonym]

Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
shell height	6	20.7	17.0	26.0	20.8	3.32
shell diameter	6	40.9	33.0	48.4	44.0	6.69
shell inflation	6	5.36	2.00	10.8	6.75	3.38

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 Bathonian to the top of the Temaikan or 168.20000 to 164.30000 Ma

Collections (38 total)

Time interval	Ma	Country or state	Original ID and collection number
Temaikan	176.0 - 164.3	New Zealand (Auckland)	X. grantmackiei (4878 233875)
Bathonian	168.2 - 165.3	USA (Montana)	X. sp. (68848)
Bathonian	168.2 - 165.3	Canada (British Columbia)	X. sp., X. vicarius (37608) X. vicarius (37609)
Late/Upper Bathonian	168.2 - 165.3	Argentina (Mendoza)	X. sp. (4882)
Late/Upper Bathonian	168.2 - 165.3	Argentina (Neuquen)	X. araucanus (158966) X. neuquensis (4881 158969 158973 158979) X. sp. A (158975)
Bathonian - Callovian	168.2 - 161.5	Canada (British Columbia)	X. hebetus (37631) X. vicarius (37627 37630)
Late/Upper Bathonian - Early/Lower Callovian	168.2 - 161.5	Canada (British Columbia)	X. bearpawensis (204169 204171 204172) X. sp. (204170)
Late/Upper Bathonian - Middle Callovian	168.2 - 161.5	Mexico (Guerrero)	Macrocephalites nikitini (233959)
Callovian	165.3 - 161.5	USA (Wyoming)	X. sp. (172986)
Callovian	165.3 - 161.5	USA (Alaska)	X. hartsocki (158693 158882) X. hebetus (68881 68985 158914) X. hebetus, X. vicarius (158704) X. sp. (68873) X. vicarius (68988 158691 158692 158697 158702 158708 158908)
Early/Lower Callovian	165.3 - 161.5	Argentina (Neuquen)	X. stipanicici (158984)
Early/Lower Callovian	165.3 - 161.5	Canada (British Columbia)	X. vicarius (185050)
Early/Lower Callovian	165.3 - 161.5	Argentina (Nequen)	X. gottschei (4883)