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[[File:Anglaspis macculloughi.jpg|thumb|left|Life restoration of ''Anglaspis macculloughi'']] |
[[File:Anglaspis macculloughi.jpg|thumb|left|Life restoration of ''Anglaspis macculloughi'']] |
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'''''Anglaspis''''' is an [[extinct]] [[genus]] of [[cyathaspidiformes|cyathaspidiform]] [[Heterostraci|heterostracan]] [[agnatha]]n. [[Fossils]] are found in marine strata of [[Europe]], from the late [[Silurian]] period until the genus' extinction during the Early [[Devonian]]. As with other cyathaspidiforms, individuals of ''Anglaspis'' had dorsal and ventral plates covering the forebody, gill pouches, and nasal openings that lay on the roof of the oral cavity.<ref>{{Cite journal|last=Watson|first=David Meredith Seares|date=1954-10-28|title=A Consideration of Ostracoderms|journal=Phil. Trans. R. Soc. Lond. B|language=en|volume=238|issue=652|pages=1–25|doi=10.1098/rstb.1954.0004|issn=0080-4622|doi-access= |
'''''Anglaspis''''' is an [[extinct]] [[genus]] of [[cyathaspidiformes|cyathaspidiform]] [[Heterostraci|heterostracan]] [[agnatha]]n. [[Fossils]] are found in marine strata of [[Europe]], from the late [[Silurian]] period until the genus' extinction during the Early [[Devonian]]. As with other cyathaspidiforms, individuals of ''Anglaspis'' had dorsal and ventral plates covering the forebody, gill pouches, and nasal openings that lay on the roof of the oral cavity.<ref>{{Cite journal|last=Watson|first=David Meredith Seares|date=1954-10-28|title=A Consideration of Ostracoderms|journal=Phil. Trans. R. Soc. Lond. B|language=en|volume=238|issue=652|pages=1–25|doi=10.1098/rstb.1954.0004|issn=0080-4622|doi-access=}}</ref> |
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Late Silurian [[species]] of ''Anglaspis'' are found in marine [[stratum|strata]] of [[Wales]] and [[England]], while most of the Early Devonian species are found in the Devonian-aged strata of [[Spitsbergen]] island, in [[Svalbard]], [[Norway]].<ref>{{Cite web|url=https://www.nhm.uio.no/besok-oss/utstillinger/tidligere%20faste%20utstillinger/fossiler/galleri/montre/english/118_554.htm|title=Anglaspis sp. - Naturhistorisk museum|website=[[Natural History Museum at the University of Oslo]]|language=no|access-date=2018-11-26}}</ref><ref>{{cite journal |last1=Ilyes |first1=Robert R. |last2=Ohta |first2=Yoshihide |last3=Guddingsmo |first3=Jonny |year=1995 |title=The Downtonian and Devonian vertebrates of Spitsbergen. *. New Heterostracans from the Lower Devonian Red Bay Group, northern Spitsbergen |
Late Silurian [[species]] of ''Anglaspis'' are found in marine [[stratum|strata]] of [[Wales]] and [[England]], while most of the Early Devonian species are found in the Devonian-aged strata of [[Spitsbergen]] island, in [[Svalbard]], [[Norway]].<ref>{{Cite web|url=https://www.nhm.uio.no/besok-oss/utstillinger/tidligere%20faste%20utstillinger/fossiler/galleri/montre/english/118_554.htm|title=Anglaspis sp. - Naturhistorisk museum|website=[[Natural History Museum at the University of Oslo]]|language=no|access-date=2018-11-26}}</ref><ref>{{cite journal |last1=Ilyes |first1=Robert R. |last2=Ohta |first2=Yoshihide |last3=Guddingsmo |first3=Jonny |year=1995 |title=The Downtonian and Devonian vertebrates of Spitsbergen. *. New Heterostracans from the Lower Devonian Red Bay Group, northern Spitsbergen |journal=Polar Research |volume=14 |issue=1 |pages=33–42 |doi=10.3402/polar.v14i1.6649 |s2cid=129455869 |doi-access=free }}</ref> |
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== Taxonomy == |
== Taxonomy == |
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| Genus: | Anglaspis
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Anglaspis is an extinct genus of cyathaspidiform heterostracan agnathan. Fossils are found in marine strata of Europe, from the late Silurian period until the genus' extinction during the Early Devonian. As with other cyathaspidiforms, individuals of Anglaspis had dorsal and ventral plates covering the forebody, gill pouches, and nasal openings that lay on the roof of the oral cavity.[1]
Late Silurian species of Anglaspis are found in marine strata of Wales and England, while most of the Early Devonian species are found in the Devonian-aged strata of Spitsbergen island, in Svalbard, Norway.[2][3]
Taxonomy
[edit]Anglaspis was, at various times, placed in the families Cyathaspididae,[4] Poraspididae,[5] and in its own family, Anglaspididae. Currently, it is placed in Ariaspidae with Ariaspis, and Listraspis, and is considered to be closely related to, if not the progenitor of Liliaspis and Paraliliaspis.[6]
References
[edit]- ^ Watson, David Meredith Seares (1954-10-28). "A Consideration of Ostracoderms". Phil. Trans. R. Soc. Lond. B. 238 (652): 1–25. doi:10.1098/rstb.1954.0004. ISSN 0080-4622.
- ^ "Anglaspis sp. - Naturhistorisk museum". Natural History Museum at the University of Oslo (in Norwegian). Retrieved 2018-11-26.
- ^ Ilyes, Robert R.; Ohta, Yoshihide; Guddingsmo, Jonny (1995). "The Downtonian and Devonian vertebrates of Spitsbergen. *. New Heterostracans from the Lower Devonian Red Bay Group, northern Spitsbergen". Polar Research. 14 (1): 33–42. doi:10.3402/polar.v14i1.6649. S2CID 129455869.
- ^ Ilyes, Robert R.; Ohta, Yoshihide; Guddingsmo, Jonny (1995-01-06). "The Downtonian and Devonian vertebrates of Spitsbergen. *. New Heterostracans from the Lower Devonian Red Bay Group, northern Spitsbergen". Polar Research. 14 (1): 33–42. doi:10.3402/polar.v14i1.6649. ISSN 1751-8369.
- ^ Denison, Robert Howard (24 April 1964). "The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates". Fieldiana: Geology. 13: 428.
- ^ Mette, Lundgren; Henning, Blom (2011). "Phylogenetic patterns in the heterostracan families Cyathaspidae, Ariaspidae and Ctenaspidae". DIVA: 16–17.
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