PBDB Taxon

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Cephalaspidiformes

Petromyzontida - Cephalaspidiformes

Taxonomy

Cephalaspidiformes is an order. It is not extant.

It was assigned to Cephalaspidomorphi by Sepkoski (2002), Long (2011) and Nelson et al. (2016).

Sister taxa

Benneviaspidiformes, Thyestiida, Tremataspidida, Tremataspidiformes

Synonyms

Osteostraci was named as a subclass.

It was reranked as the class Osteostraci by Gadow (1898); it was reranked as the order Osteostraci by Hay (1902) and Dineley and Metcalf (1999); it was synonymized subjectively with Cephalaspidiformes by Long (2011) and Nelson et al. (2016).

It was assigned to Hypostomata by Gadow (1898); to Aspidoganoidei by Hay (1902); to Monorrhina by Obruchev (1964); and to Agnatha by Dineley and Metcalf (1999).

Synonymy list

Year	Name and author
1898	Osteostraci Gadow p. 4
1902	Osteostraci Hay p. 340
1964	Osteostraci Obruchev p. 106
1999	Osteostraci Dineley and Metcalf p. 11
2002	Cephalaspidoformes Sepkoski
2011	Cephalaspidiformes Long p. 241
2016	Cephalaspidiformes Nelson et al. p. 33

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874

Rank	Name	Author
subphylum	Vertebrata
class	Petromyzontida
order	Cephalaspidiformes
order	Cephalaspidiformes

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.

Or. †Cephalaspidiformes

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G. †Aachenaspis

G. †Fieldingaspis

G. †Ilemoraspis

G. †Oeselaspis

G. †Procephalaspis

G. †Saaremaaspis

G. †Sclerodus

G. †Tannuaspis

G. †Thyestes

G. †Timanaspis

G. †Tuvaspis

G. †Tyriaspis

Invalid names: Osteostraci [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

marinesubp

Locomotion:

fast-movingc

Life habit:

nektonicc

Diet:

carnivorec

Created:

2009-10-08 12:24:48

Modified:

2009-10-08 14:24:48

Source: c = class, subp = subphylum

References: Carroll 1988, Hendy et al. 2009

Age range: base of the Homerian to the top of the Emsian or 430.50000 to 393.30000 Ma

Collections (28 total)

Time interval	Ma	Country or state	Original ID and collection number
Homerian	430.5 - 427.4	Sweden	Oeselaspis pustulata, Saaremaaspis mickwitzi, Tremataspis milleri (179989) Oeselaspis pustulata, Saaremaaspis mickwitzi, Tremataspis milleri, Tremataspis schmidti (179988) Saaremaaspis mickwitzi, Tremataspis milleri, Tremataspis schmidti (179987) Tremataspis schmidti (179990)
Rootsikula	426.2 - 422.9	Estonia	Cephalaspidoformes indet. (26922) Oeselaspis pustulata, Saaremaaspis mickwitzi, Tremataspis schmidti (13824) Saaremaaspis mickwitzi, Tremataspis simonsoni, Tremataspis schmidti (13823)
Pridoli	423.0 - 419.2	United Kingdom (England)	Thyestes sp. (26917)
Pridoli	423.0 - 419.2	Lithuania	Cephalaspis sp. (207344)
Pridoli - Helderbergian	423.0 - 393.3	Russian Federation	Tannuaspis levenkoi (24785)
Paadla	422.9 - 419.2	Estonia (Saaremaa)	Oeselaspis pustulata, Procephalaspis oeselensis, Tremataspis mammillata, Tremataspis milleri (195601)
Paadla	422.9 - 419.2	Estonia	Cephalaspidoformes indet. (26925) Oeselaspis pustulata, Procephalaspis oeselensis, Tremataspis mammillata, Tremataspis milleri, Tremataspis panderi, Tremataspis patteni, Tremataspis rohoni, Tremataspis scalaris (13826)
Lochkovian	419.2 - 410.8	USA (Wyoming)	Cephalaspis sp. (153534)
Lochkovian	419.2 - 410.8	United Kingdom (Scotland)	Cephalaspis sp. (26908)
Lochkovian	419.2 - 410.8	Canada (Nova Scotia)	Cephalaspis sp. (14201) Cephalaspis sp., Cephalaspis novaescotiae (161378)
Lochkovian	419.2 - 410.8	Ukraine	Cephalaspis sp. (26978)
Lochkovian	419.2 - 410.8	United Kingdom (Herefordshire)	Cephalaspis sp. (201736)
Lochkovian	419.2 - 410.8	United Kingdom (England)	Benneviaspis salopiensis, Kiaeraspis sp. (90352) Cephalaspis sp. (26918)
Lochkovian - Pragian	419.2 - 407.6	Ukraine	Cephalaspis kozlowskii (23447)
Pragian	410.8 - 407.6	Ukraine	Cephalaspis bucovinensis (90348)
Emsian	407.6 - 393.3	USA (Wyoming)	Cephalaspis wyomingense (26176)
Emsian	407.6 - 393.3	Canada (Quebec)	Cephalaspis dawsoni (161376) Cephalaspis westolli (161379)
Emsian	407.6 - 393.3	Canada (New Brunswick)	Cephalaspis campbelltonensis, Cephalaspis canadensis, Cephalaspis jexi (161373) Cephalaspis sp., Cephalaspis acadica (161372)