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Petromyzontida -

Petromyzontida is a class.

It was assigned to Petromyzontomorphi by Long (2011); and to Vertebrata by Van Der Laan (2019).

Sister taxa
Atelaspidiformes, Birkeniiformes, Cephalaspidida, Cephalaspidiformes, Galeaspidiformes, Petromyzontiformes (syn. Hyperoartii), Pituriaspidiformes

View classification of included taxa

Synonymy list
YearName and author
1971Cephalaspidomorphi Moy-Thomas and Mile
2002Cephalaspidomorphi Sepkoski, Jr.
2011Cephalaspidomorphi Long p. 241
2011Petromyzontida Long p. 241
2019Petromyzontida Van Der Laan p. 15

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phylumChordataHaeckel 1847

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.

No diagnoses are available
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

Maximum range based only on fossils: base of the Homerian to the top of the Early/Lower Aptian or 430.50000 to 122.46000 Ma
Minimum age of oldest fossil (stem group age): 427.4 Ma

Collections (22 total)

Time interval Ma Country or state Original ID and collection number
Llandovery - Wenlock443.4 - 427.4United Kingdom (Scotland) Birkenia sp. (26889)
Wenlock - Ludlow433.4 - 423.0United Kingdom (Scotland) Birkenia sp., Lasanius sp. (26906)
Homerian430.5 - 427.4Sweden Oeselaspis pustulata, Saaremaaspis mickwitzi (179988 179989) Saaremaaspis mickwitzi (179987)
Homerian - Gorstian430.5 - 425.6United Kingdom (Scotland) Hemicyclaspis sp. (26907)
Ludlow427.4 - 423.0United Kingdom (Scotland) Birkenia sp., Lasanius sp. (26896)
Rootsikula426.2 - 422.9Estonia Cephalaspidoformes indet. (26922) Oeselaspis pustulata, Saaremaaspis mickwitzi, Witaaspis schrenckii (13824) Saaremaaspis mickwitzi, Witaaspis schrenckii (13823)
Pridoli423.0 - 419.2Canada (Nunavut) Hemicyclaspis murchisoni (90324)
Pridoli423.0 - 419.2United Kingdom (England) Hemicyclaspis sp. (26915) Thyestes sp., Hemicyclaspis sp. (26917)
Pridoli - Helderberg423.0 - 391.9Russian Federation Tannuaspis levenkoi (24785)
Paadla422.9 - 419.2Estonia Cephalaspidoformes indet. (26925) Oeselaspis pustulata, Procephalaspis oeselensis, Witaaspis schrenckii (13826)
Paadla422.9 - 419.2Estonia (Saaremaa) Oeselaspis pustulata, Procephalaspis oeselensis, Witaaspis schrenkii (195601)
Frasnian382.7 - 372.2Canada (Quebec) Euphanerops longaevus (179176)
Famennian372.2 - 358.9South Africa (Eastern Cape) Priscomyzon riniensis (68049)
Arnsbergian326.4 - 318.1USA (Montana) Hardistiella montanensis (116654)
Moscovian315.2 - 307.0USA (Illinois) Mayomyzon pieckoensis (132078)
Early/Lower Aptian125.45 - 122.46China (Nei Mongol) Mesomyzon mengae (68047)