PBDB Taxon

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Zenostephanus

Cephalopoda - Ammonitida - Perisphinctidae

Taxonomy

Zenostephanus was named by Callomon et al. (2009). Its type is Aulacostephanus (Xenostephanus) ranbyensis.

It was assigned to Perisphinctidae by Callomon et al. (2009).

Species

Z. ranbyensis, Zonovia (Xenostephanus) sachsi, Zonovia (Xenostephanus) subquadrata

Synonyms

Xenostephanus was named by Arkell and Callomon (1963) [Sepkoski's age data: J Kimm-l Sepkoski's reference number: 302]. Its type is Xenostephanus chiottii.

It was reranked as Aulacostephanus (Xenostephanus) by Arkell and Callomon (1963); it was reranked as Zonovia (Xenostephanus) by Mesezhnikov (1984); it was replaced with Zenostephanus by Callomon et al. (2009).

It was assigned to Aulacostephanus by Arkell and Callomon (1963); to Zonovia by Mesezhnikov (1984); and to Ammonoidea by Sepkoski (2002).

Synonymy list

Year	Name and author
1963	Aulacostephanus (Xenostephanus) Arkell and Callomon
1963	Xenostephanus Arkell and Callomon
1984	Zonovia (Xenostephanus) Mesezhnikov p. 118
2002	Xenostephanus Sepkoski
2009	Zenostephanus Callomon et al. p. 671

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

Rank	Name	Author
class	Cephalopoda	Cuvier 1797
subclass	Ammonoidea	()
order	Ammonitida
suborder	Ammonitina	Hyatt 1889
superfamily	Perisphinctoidea	(Steinman 1890)
family	Perisphinctidae	Steinmann 1890
genus	Zenostephanus

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. †Zenostephanus Callomon et al. 2009

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†Zenostephanus ranbyensis Arkell and Callomon 1963

Invalid names: Xenostephanus Arkell and Callomon 1963 [replaced]

Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
shell height	2	17.1	12.7	23.0	17.9	7.28
shell diameter	2	54.3	41.0	72.0	56.5	21.9
shell inflation	2	26.9	22.6	32.0	27.3	6.65

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: base of the Early/Lower Kimmeridgian to the top of the Kimmeridgian or 155.70000 to 152.10000 Ma

Collections (3 total)

Time interval	Ma	Country or state	Original ID and collection number
Kimmeridgian	157.3 - 152.1	Russian Federation	Zonovia subquadrata (66573)
Kimmeridgian - Early/Lower Kimmeridgian	157.3 - 150.8	Russian Federation	Z. sachsi (191018)
Early/Lower Kimmeridgian	155.7 - 150.8	Russian Federation (Krasnoyarsk)	Zonovia ranbyensis, Zonovia sachsi, Zonovia subquadrata (163996)