Maiaspondylus: Difference between revisions
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'''''Maiaspondylus''''' is an extinct genus of [[Ichthyosaur]]. Its remains have been found in [[North America]].<ref>Dal Sasso, Cristiano and Giovanni Pinna, 1996. Besanosaurus leptorhynchus n. gen. n. sp., a new shastasaurid ichthyosaur from the Middle Triassic of Besano (Lombardy, N. Italy). Paleontologia Lombarda, Nuova seire Volume IV: 1-23.</ref> |
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| name = ''Maiaspondylus'' |
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| fossil_range = [[Early Cretaceous]], {{fossil_range|110}} |
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| genus = Maiaspondylus |
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| parent_authority = Maxwell & Caldwell, [[2006 in paleontology|2006]] |
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| authority = Maxwell & Caldwell, 2006 |
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| species = lindoei |
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}} |
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'''''Maiaspondylus''''' is an [[extinct]] [[genus]] of [[ophthalmosaurid]] [[ichthyosaur]] known from [[Northwest Territories]] of [[Canada]].<ref name=Maiaspondylus>{{cite journal |authors=Erin E. Maxwell and Michael W. Caldwell |year=2006 |title=A new ichthyosaur from the Los Molles Formation (Early Bajocian), Neuquen Basin, Argentina |url=http://www.jstor.org/stable/1306766 |journal=Journal of Paleontology |volume=73 |issue=4 |pages=677-681 }}</ref> |
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==Description== |
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''Maiaspondylus'' is known from the [[holotype]] [[University of Alberta|UALVP]] 45635, a disarticulated but nearly complete [[skeleton]] preserved in three dimensions and from the referred materials UALVP 45639, two [[articulate]]d partially preserved embryos and eight articulated [[vertebra]]e of an adult, UALVP 45640, 14 articulated vertebrae of a juvenile, UALVP 45640, 12 articulated vertebrae, UALVP 45642, a partial snout and left dentaries with teeth and UALVP 45643, a fragmentary snout. All specimens were collected at [[Hay River]] from the [[Loon River Formation]], dating to the early [[Albian]] stage of the [[Early Cretaceous]], about 110 [[mya (unit)|million years ago]].<ref name=Maiaspondylus/> |
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All ''Maiaspondylus'' specimens were originally referred to ''[[Platypterygius]]''. However, all recent [[cladistic]] analyses found that ''Maiaspondylus'' is a valid genus of ophthalmosaurid.<ref name=DM10>{{cite journal |authors=Patrick S. Druckenmiller and Erin E. Maxwell |year=2010 |title=A new Lower Cretaceous (lower Albian) ichthyosaur genus from the Clearwater Formation, Alberta, Canada |journal=Canadian Journal of Earth Sciences |volume=47 |issue=8 |pages=1037–1053 |doi=10.1139/E10-028 |url=http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=eng&journal=cjes&volume=47&year=0&issue=8&msno=e10-028}}</ref><ref name=Fetal11>{{cite journal |last=Fischer |first=V. |coauthors=Masure, E.; Arkhangelsky, M.S.; and Godefroit, P. |year=2011 |title=A new Barremian (Early Cretaceous) ichthyosaur from western Russia |journal=Journal of Vertebrate Paleontology |volume=31 |issue=5 |pages=1010-1025 |doi=10.1080/02724634.2011.595464 |url=http://www.tandfonline.com/doi/abs/10.1080/02724634.2011.595464}}</ref> Patrick S. Druckenmiller and Erin E. Maxwell (2010) found it to be most closely related to ''"[[Platypterygius]]" americanus'', which probably don't belong to the genus ''Platypterygius''.<ref name=DM10/> |
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==Etymology== |
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''Maiaspondylus'' was named by Erin E. Maxwell and Michael W. Caldwell in [[2006 in paleontology|2006]] and the [[type species]] is ''Maiaspondylus lindoei''. The [[name of a biological genus|generic name]] is derived from ''maia'' (μαία), [[Greek language|Greek]] for "caring mother" and ''spondylos'' (σπόνδυλος), Greek for "vertebra".<ref name=Maiaspondylus/> The generic name named in reference to the unique specimen, UALVP 45639, that composed of two embryos agglutinated to eight articulated [[vertebra]]e of an adult (within its body cavity), presumably the mother. Erin E. Maxwell and Michael W. Caldwell (2003) suggests that this specimen proves that ''Maiaspondylus'' was [[Vivipary|viviparous]], giving live birth. These embryos are the geologically youngest and the physically smallest known ichthyosaur embryos.<ref name=MCembryos>{{cite journal |authors=Erin E. Maxwell and Michael W. Caldwell |year=2003 |title=First record of live birth in Cretaceous ichthyosaurs: closing an 80 million year gap |url=http://rspb.royalsocietypublishing.org/content/270/Suppl_1/S104.full.pdf |journal=Proceedings of the Royal Society of London B |volume=270 |issue=1 |pages=S104-S107 |doi=10.1098/rsbl.2003.0029 }}</ref> The [[specific name (zoology)|specific name]] honors the Geology Museum of the University of Alberta technician Allan Lindoe for discovering, collecting and preparating the specimens.<ref name=Maiaspondylus/> |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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{{portal|Paleontology}} |
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[[Category:Cretaceous ichthyosaurs]] |
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{{Ichthyosaur-stub}} |
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[[Category:Fossil taxa described in 2006]] |
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[[Category:Ichthyosaurs]] |
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[[es:Maiaspondylus]] |
[[es:Maiaspondylus]] |
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Revision as of 14:54, 17 October 2011
| Maiaspondylus Temporal range: Early Cretaceous,
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | †Ichthyosauria |
| Family: | †Ophthalmosauridae |
| Genus: | †Maiaspondylus Maxwell & Caldwell, 2006 |
| Species: | †M. lindoei
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| Binomial name | |
| †Maiaspondylus lindoei Maxwell & Caldwell, 2006
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Maiaspondylus is an extinct genus of ophthalmosaurid ichthyosaur known from Northwest Territories of Canada.[1]
Description
Maiaspondylus is known from the holotype UALVP 45635, a disarticulated but nearly complete skeleton preserved in three dimensions and from the referred materials UALVP 45639, two articulated partially preserved embryos and eight articulated vertebrae of an adult, UALVP 45640, 14 articulated vertebrae of a juvenile, UALVP 45640, 12 articulated vertebrae, UALVP 45642, a partial snout and left dentaries with teeth and UALVP 45643, a fragmentary snout. All specimens were collected at Hay River from the Loon River Formation, dating to the early Albian stage of the Early Cretaceous, about 110 million years ago.[1]
All Maiaspondylus specimens were originally referred to Platypterygius. However, all recent cladistic analyses found that Maiaspondylus is a valid genus of ophthalmosaurid.[2][3] Patrick S. Druckenmiller and Erin E. Maxwell (2010) found it to be most closely related to "Platypterygius" americanus, which probably don't belong to the genus Platypterygius.[2]
Etymology
Maiaspondylus was named by Erin E. Maxwell and Michael W. Caldwell in 2006 and the type species is Maiaspondylus lindoei. The generic name is derived from maia (μαία), Greek for "caring mother" and spondylos (σπόνδυλος), Greek for "vertebra".[1] The generic name named in reference to the unique specimen, UALVP 45639, that composed of two embryos agglutinated to eight articulated vertebrae of an adult (within its body cavity), presumably the mother. Erin E. Maxwell and Michael W. Caldwell (2003) suggests that this specimen proves that Maiaspondylus was viviparous, giving live birth. These embryos are the geologically youngest and the physically smallest known ichthyosaur embryos.[4] The specific name honors the Geology Museum of the University of Alberta technician Allan Lindoe for discovering, collecting and preparating the specimens.[1]
References
- ^ a b c d "A new ichthyosaur from the Los Molles Formation (Early Bajocian), Neuquen Basin, Argentina". Journal of Paleontology. 73 (4): 677–681. 2006.
{{cite journal}}: Cite uses deprecated parameter|authors=(help) - ^ a b "A new Lower Cretaceous (lower Albian) ichthyosaur genus from the Clearwater Formation, Alberta, Canada". Canadian Journal of Earth Sciences. 47 (8): 1037–1053. 2010. doi:10.1139/E10-028.
{{cite journal}}: Cite uses deprecated parameter|authors=(help) - ^ Fischer, V. (2011). "A new Barremian (Early Cretaceous) ichthyosaur from western Russia". Journal of Vertebrate Paleontology. 31 (5): 1010–1025. doi:10.1080/02724634.2011.595464.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ "First record of live birth in Cretaceous ichthyosaurs: closing an 80 million year gap" (PDF). Proceedings of the Royal Society of London B. 270 (1): S104–S107. 2003. doi:10.1098/rsbl.2003.0029.
{{cite journal}}: Cite uses deprecated parameter|authors=(help)
