Cheiruridae

Cheiruridae; Temporal range: Furongian–Givetian PreꞒ Ꞓ O S D C P T J K Pg N
	Paraceraurus exsul, Middle Ordovician, St. Petersburg region, Russia
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Phacopida
Suborder:	†Cheirurina
Family:	†Cheiruridae; Hawle & Corda, 1847
Subfamilies
	† Hawle & Corda, 1847; † Wittington & Evitt, 1954; † Öpik, 1937; † Raimond, 1913; † Lane, 1971; † Evitt, 1951; † Sdzuy, 1955; † Öpik, 1937;

Cheiruridae is a family of phacopid trilobites of the suborder Cheirurina. Its members, as with other members of the suborder, had distinctive pygidia modified into finger-like spines. They first appeared in the uppermost Cambrian (upper Furongian), and persisted until the end of the Middle Devonian (Givetian). Currently about 657 species assigned to 99 genera are included.^[1]

Distribution[]

The subfamily Cheirurinae with 269 species in 38 genera occur from the Floian to the Givetian and are probably monophyletic. The 109 species in 15 genera of the are also probably monophyletic, and are known from the Floian to the Ludfordian. The were present between the Floian and the Upper Katian, enveloping 22 species in 5 genera, of which the monophyly is unclear. The are probably monophyletic, occur from the Dapingian to the Gorstian, having 71 species assigned to 6 genera. The possibly paraphyletic with 67 species in 13 genera are known between the Floian and upper Katian. The are a small monophyletic group with 13 species in 2 genera. The Pilekiinae are the earliest subfamilily and therefore certainly paraphyletic, occurring in the upper Furongian and going extinct in the Darriwilian with 56 known species assigned to 19 genera. The monotypic has about 50 species between the Floian and Přídolí.^[1]

Genera[]

†
†Actinopeltis
†
†
†
†
†Aleia
†
†
†
†Borealaspis
†Bornholmaspis
†Bufoceraurus
†Ceraurinella
†Ceraurinium
†Ceraurinus
†Cerauromeros
†Cerauropeltis
†Ceraurus
†Cheirurus (type genus)
†Chiozoon
†Contracheirurus
†Courtessolium
†Crotalocephalides
†Crotalocephalina
†Crotalocephalus
†
†Cyrtometopus
†Deiphon
†Didrepanon
†Eccoptochile
†Eccoptochiloides
†Forteyops
†Foulonia
†Gabriceraurus
†
†Hadromeros
†Hammannopyge
†Hapsiceraurus
†Heliomera
†Heliomeroides
†Holia
†
†
†Kawina
†Kolymella
†Krattaspis
†Ktenoura
†
†
†
†
†
†
†
†Paraceraurus
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†Sphaerexochus
†Sphaerocoryphe
†
†Sycophantia
†
†
†
†
†
†
†

References[]

^ ^a ^b J.M. Adrian (2014). "20. A synopsis of Ordovician trilobite distribution and diversity". In D.A.T. Harper; T. Servais (eds.). Early Palaeozoic Biogeography and Palaeogeography. Memoirs of the Geological Society of London. Vol. 38. Geological Society of London. p. 490. ISBN 978-1862393738.

External links[]

Media related to Cheiruridae at Wikimedia Commons

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[HarperServais-1] J.M. Adrian (2014). "20. A synopsis of Ordovician trilobite distribution and diversity". In D.A.T. Harper; T. Servais (eds.). Early Palaeozoic Biogeography and Palaeogeography. Memoirs of the Geological Society of London. Vol. 38. Geological Society of London. p. 490. ISBN 978-1862393738.

[1]

Cheiruridae Temporal range: Furongian–Givetian PreꞒ Ꞓ O S D C P T J K Pg N

Paraceraurus exsul, Middle Ordovician, St. Petersburg region, Russia
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita
Order:	†Phacopida
Suborder:	†Cheirurina
Family:	†Cheiruridae Hawle & Corda, 1847
Subfamilies
† Hawle & Corda, 1847 † Wittington & Evitt, 1954 † Öpik, 1937 † Raimond, 1913 † Lane, 1971 † Evitt, 1951 † Sdzuy, 1955 † Öpik, 1937