Abyssosaurus: Difference between revisions
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{{Short description|Extinct genus of reptiles}} |
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{{automatic taxobox |
{{automatic taxobox |
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| fossil_range = [[Early Cretaceous]], {{fossil_range|133|130}} |
| fossil_range = [[Early Cretaceous]], {{fossil_range|133|130}} |
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| image = Abyssosaurus nataliae.png |
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| image_caption = [[Life restoration]] |
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| taxon = Abyssosaurus |
| taxon = Abyssosaurus |
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| authority = Berezin, [[2011 in paleontology|2011]] |
| authority = Berezin, [[2011 in paleontology|2011]] |
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| type_species = '''''Abyssosaurus nataliae''''' |
| type_species = {{extinct}}'''''Abyssosaurus nataliae''''' |
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| type_species_authority = Berezin, 2011 |
| type_species_authority = Berezin, 2011 |
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}} |
}} |
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'''''Abyssosaurus''''' is an [[extinct]] [[genus]] of [[cryptoclidid]]<ref name=plesiosaurturnover/> [[plesiosaur]] known from the [[Early Cretaceous]] of [[Chuvash Republic]], western [[Russia]]. |
'''''Abyssosaurus''''' is an [[extinct]] [[genus]] of [[cryptoclidid]]<ref name=plesiosaurturnover/> [[plesiosaur]] known from the [[Early Cretaceous]] of [[Chuvash Republic]], western [[Russia]]. It possessed a shortened skull, and it has been suggested that it primarily inhabited the [[bathyal zone]].<ref name="berezin2019"/> |
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==Discovery== |
==Discovery== |
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''Abyssosaurus'' is known only from the [[holotype]] specimen, [[Chuvash National Museum|Museum of Chuvash Natural Historical Society]] (MChEIO) no. PM/1, a partial [[postcrania]]l [[skeleton]]. The holotype was collected in [[Poretskii District]] of [[Chuvashia]], near [[Mishukovo, Chuvash Republic|Mishukovo]], dating to the late [[Hauterivian]] [[faunal stage]] of the [[Early Cretaceous]], about 133-130 [[million years ago]]. The specimen |
''Abyssosaurus'' is known only from the [[holotype]] specimen, [[Chuvash National Museum|Museum of Chuvash Natural Historical Society]] (MChEIO) no. PM/1, a partial [[postcrania]]l [[skeleton]]. The holotype was collected in [[Poretskii District]] of [[Chuvashia]], near [[Mishukovo, Chuvash Republic|Mishukovo]], dating to the late [[Hauterivian]] [[faunal stage]] of the [[Early Cretaceous]], about 133-130 [[million years ago]]. The specimen was initially thought to occupy an intermediate position between the Late Jurassic ''[[Tatenectes]]'' and ''[[Kimmerosaurus]]'' and the Late Cretaceous ''[[Aristonectes]]'' and ''[[Kaiwhekea]]''. Berezin (2011) considered ''Abyssosaurus'' to represent the first reliable record of [[Aristonectidae]] in Russia.<ref name=Abyssosaurus>{{cite journal |first1=A.Y. |last1=Berezin |year=2011 |title=A new plesiosaur of the family Aristonectidae from the early cretaceous of the center of the Russian platform |journal=Paleontological Journal |volume=45 |issue=6 |pages=648–660 |doi=10.1134/S0031030111060037 |s2cid=129045087 }}</ref> A large [[phylogenetic]] analysis performed by [[Roger Benson]] and [[Patrick Druckenmiller]] found it to be a derived [[cryptoclidid]] closely related to ''[[Colymbosaurus]]''.<ref name=plesiosaurturnover>{{Cite journal | last1 = Benson | first1 = R. B. J. | last2 = Druckenmiller | first2 = P. S. | doi = 10.1111/brv.12038 | title = Faunal turnover of marine tetrapods during the Jurassic-Cretaceous transition | journal = Biological Reviews | pages = 1–23| year = 2013 | pmid = 23581455| volume=89| issue = 1 | s2cid = 19710180 }}</ref> |
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==Description== |
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''Abyssosaurus'' was a large plesiosaur, measuring roughly {{convert|7|m|ft}} in total body length.<ref name=Abyssosaurus/> Approximately half of the total body length was solely the neck, which measured to be about {{convert|3.5|m|ft}} metres long. Its skull length was about {{convert|30|cm|in}} <ref>{{cite journal|last1=Berezin|first1=A.Y.|year=2018|title=Craniology of the Plesiosaur ''Abyssosaurus nataliae'' Berezin (Sauropterygia, Plesiosauria) from the Lower Cretaceous of the Central Russian Platform|journal=Paleontological Journal|volume=52|issue=3|pages=328–341|doi=10.1134/S0031030118030036|s2cid=91151554 |issn=0031-0301}}</ref><ref name=Abyssosaurus/> |
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In 2019, Alexander Yu Berezin described the overall anatomy of ''Abyssosaurus'' in great detail. The [[maxilla]] is noted to possess features similar to those present in immature elasmosaurids. The apex cutting edge deflects forwards at a 110° angle, and the rear part of the bone is undeveloped, protruding backwards in the form of a small spike. Berezin notes that the maxillary restructuring is associated with the overall structure of the skull. The [[orbit (anatomy)|eye sockets]] are large and rounded, more so than in most other [[cryptoclidids]]. The overall skull is extremely short and triangular.<ref name="berezin2019"/<ref>A. Yu. Berezin 2019 "[https://www.academia.edu/44636598/%D0%9C%D0%BE%D1%80%D1%84%D0%BE%D1%84%D1%83%D0%BD%D0%BA%D1%86%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5_%D0%BE%D1%81%D0%BE%D0%B1%D0%B5%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D0%B8_%D0%BF%D0%BB%D0%B5%D0%B7%D0%B8%D0%BE%D0%B7%D0%B0%D0%B2%D1%80%D0%B0_Abyssosaurus_nataliae_PLESIOSAUROIDEA_PLESIOSAURIA_%D0%B2_%D1%81%D0%B2%D1%8F%D0%B7%D0%B8_%D1%81_%D0%B0%D0%B4%D0%B0%D0%BF%D1%82%D0%B0%D1%86%D0%B8%D0%B5%D0%B9_%D0%BA_%D0%B3%D0%BB%D1%83%D0%B1%D0%BE%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D0%BD%D0%BE%D0%BC%D1%83_%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D1%83_%D0%B6%D0%B8%D0%B7%D0%BD%D0%B8 Morphofunctional features of the plesiosaur Abyssosaurus nataliae (Plesiosauroidea: Plesiosauria) in connection with adaptations to a deep-water lifestyle.]" Ministry of National Resources and Ecology of the Russian Federation [in Russian].</ref> |
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''Abyssosaurus''<nowiki/>'s [[gastralia]] exhibit [[pachyostosis]], apparently with the sole purpose of making the animal less buoyant.<ref name="berezin2019"/> Indeed, O'Keefe ''et al'' noted that such a build would make a plesiosaur more resistant to turbulence, allowing it to maintain stability.<ref name="o'keefeetal2011"/<ref>O'Keefe, FR; Street, HP; Wilhelm, BC; Richards, C; Zhu, H; 2011 "A new skeleton of the cryptoclidid plesiosaur Tatenectes laramiensis reveals a novel body shape among plesiosaurs." Journal of Vertebrate Paleontology. 31 (2): 330–339.</ref> The flippers, too, display pachyostosis, and rear flippers of Abyssosaurus were longer than the front flippers. This is a trait also seen in other [[Cryptoclididae|colymbosaurines]].<ref name="berezin2019"/> Based on this, Berezin suggests that ''Abyssosaurus'' and other colymbosaurines were efficient divers, able to hover in a diagonal position above the seabed while searching for food.<ref name="berezin2019"/> |
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== Taxonomy == |
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Initially, it was suggested that ''Abyssosaurus'' was intermediate between ''[[Tatenectes]]'' and ''[[Kimmerosaurus]]'', two cryptoclidids, and ''[[Aristonectes]]'' and ''[[Kaiwhekea]]'', two [[elasmosaurids]]. Later analysis suggests that it was a colymbosaurine cryptoclidid.<ref name="benson&bowdler2014"/> Below is a phylogenetic tree of the [[Cryptoclididae]], after Benson & Bowdler (2014):<ref name="benson&bowdler2014"/<ref>Benson, RBJ; Bowdler, T; 2014 "Anatomy of Colymbosaurus megadeirus (Reptilia: Plesiosauria) from the Kimmeridge Clay Formation of the UK, and high diversity among Late Jurassic plesiosauroids." Journal of Vertebrate Palaeontology. 34 (5): 1053–1071.</ref> |
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{{clade|style=font-size:85%; line-height:85%; |
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|1={{clade |
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|1=''[[Plesiopterys]]'' |
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|2={{clade |
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|label2=[[Cryptoclididae]] |
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|1=[[Xenopsaria]] ([[Elasmosauridae]] + [[Leptocleidia]]) |
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|2={{clade |
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|1={{clade |
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|1={{clade |
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|1={{clade |
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|1=''[[Picrocleidus]]'' |
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|2=''[[Muraenosaurus]]''}} |
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|2=''[[Tricleidus]]''}} |
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|2={{clade |
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|1={{clade |
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|1=''[[Tatenectes]]'' |
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|2=''[[Kimmerosaurus]]''}} |
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|2=''[[Cryptoclidus]]''}} }} |
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|2={{clade |
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|1={{clade |
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|1={{clade |
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|1='''''Abyssosaurus''''' |
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|2=''[[Colymbosaurus]]''}} |
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|2=''[[Spitrasaurus]]'' |
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|3=''[[Djupedalia]]''}} |
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|2={{clade |
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|1=''[[Plesiosaurus|"Plesiosaurus" manselli]]'' |
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|2=''[[Pantosaurus]]''}} }} }} }} }} }} |
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== Palaeobiology == |
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In an attempt to explain the peculiar anatomy of ''Abyssosaurus'', Berezin noted that adaptation to cold, harsh, [[deep-sea]] conditions is accompanied by the loss of ontogenetic stages. Organisms not only retain the [[paedomorphic]] features of their young, but also exhibit behaviours similar to those of much younger animals—slow, relatively sedentary lifestyles. Such organisms typically spend a great deal of time growing up, and have a long life expectancy. The [[sperm whale]]'s behaviour and morphology, for example, allow it to rest for a long time after a series of deep dives, sleeping vertically near the surface of the water.<ref name="berezin2019"/> ''Abyssosaurus'' probably dwelled and fed primarily in the [[bathyal zone]], occasionally rising up to the surface to take in a gulp of air. Indeed, the staple foods of the cryptoclidids, [[crustaceans]] and [[cephalopods]], were present in this environment.<ref name="berezin2019"/> |
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==See also== |
==See also== |
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[[Category:Fossil taxa described in 2011]] |
[[Category:Fossil taxa described in 2011]] |
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[[Category:Cryptoclidids]] |
[[Category:Cryptoclidids]] |
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[[Category:Sauropterygian genera]] |
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Latest revision as of 14:53, 22 September 2024
| Abyssosaurus Temporal range: Early Cretaceous,
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|---|---|
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| Life restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Cryptoclididae |
| Genus: | †Abyssosaurus Berezin, 2011 |
| Type species | |
| †Abyssosaurus nataliae Berezin, 2011
| |
Abyssosaurus is an extinct genus of cryptoclidid[1] plesiosaur known from the Early Cretaceous of Chuvash Republic, western Russia. It possessed a shortened skull, and it has been suggested that it primarily inhabited the bathyal zone.[2]
Discovery
[edit]Abyssosaurus is known only from the holotype specimen, Museum of Chuvash Natural Historical Society (MChEIO) no. PM/1, a partial postcranial skeleton. The holotype was collected in Poretskii District of Chuvashia, near Mishukovo, dating to the late Hauterivian faunal stage of the Early Cretaceous, about 133-130 million years ago. The specimen was initially thought to occupy an intermediate position between the Late Jurassic Tatenectes and Kimmerosaurus and the Late Cretaceous Aristonectes and Kaiwhekea. Berezin (2011) considered Abyssosaurus to represent the first reliable record of Aristonectidae in Russia.[3] A large phylogenetic analysis performed by Roger Benson and Patrick Druckenmiller found it to be a derived cryptoclidid closely related to Colymbosaurus.[1]
Description
[edit]Abyssosaurus was a large plesiosaur, measuring roughly 7 metres (23 ft) in total body length.[3] Approximately half of the total body length was solely the neck, which measured to be about 3.5 metres (11 ft) metres long. Its skull length was about 30 centimetres (12 in) [4][3]
In 2019, Alexander Yu Berezin described the overall anatomy of Abyssosaurus in great detail. The maxilla is noted to possess features similar to those present in immature elasmosaurids. The apex cutting edge deflects forwards at a 110° angle, and the rear part of the bone is undeveloped, protruding backwards in the form of a small spike. Berezin notes that the maxillary restructuring is associated with the overall structure of the skull. The eye sockets are large and rounded, more so than in most other cryptoclidids. The overall skull is extremely short and triangular.[2]
Abyssosaurus's gastralia exhibit pachyostosis, apparently with the sole purpose of making the animal less buoyant.[2] Indeed, O'Keefe et al noted that such a build would make a plesiosaur more resistant to turbulence, allowing it to maintain stability.[5] The flippers, too, display pachyostosis, and rear flippers of Abyssosaurus were longer than the front flippers. This is a trait also seen in other colymbosaurines.[2] Based on this, Berezin suggests that Abyssosaurus and other colymbosaurines were efficient divers, able to hover in a diagonal position above the seabed while searching for food.[2]
Taxonomy
[edit]Initially, it was suggested that Abyssosaurus was intermediate between Tatenectes and Kimmerosaurus, two cryptoclidids, and Aristonectes and Kaiwhekea, two elasmosaurids. Later analysis suggests that it was a colymbosaurine cryptoclidid.[6] Below is a phylogenetic tree of the Cryptoclididae, after Benson & Bowdler (2014):[6]
Palaeobiology
[edit]In an attempt to explain the peculiar anatomy of Abyssosaurus, Berezin noted that adaptation to cold, harsh, deep-sea conditions is accompanied by the loss of ontogenetic stages. Organisms not only retain the paedomorphic features of their young, but also exhibit behaviours similar to those of much younger animals—slow, relatively sedentary lifestyles. Such organisms typically spend a great deal of time growing up, and have a long life expectancy. The sperm whale's behaviour and morphology, for example, allow it to rest for a long time after a series of deep dives, sleeping vertically near the surface of the water.[2] Abyssosaurus probably dwelled and fed primarily in the bathyal zone, occasionally rising up to the surface to take in a gulp of air. Indeed, the staple foods of the cryptoclidids, crustaceans and cephalopods, were present in this environment.[2]
See also
[edit]References
[edit]- ^ a b Benson, R. B. J.; Druckenmiller, P. S. (2013). "Faunal turnover of marine tetrapods during the Jurassic-Cretaceous transition". Biological Reviews. 89 (1): 1–23. doi:10.1111/brv.12038. PMID 23581455. S2CID 19710180.
- ^ a b c d e f g A. Yu. Berezin 2019 "Morphofunctional features of the plesiosaur Abyssosaurus nataliae (Plesiosauroidea: Plesiosauria) in connection with adaptations to a deep-water lifestyle." Ministry of National Resources and Ecology of the Russian Federation [in Russian].
- ^ a b c Berezin, A.Y. (2011). "A new plesiosaur of the family Aristonectidae from the early cretaceous of the center of the Russian platform". Paleontological Journal. 45 (6): 648–660. doi:10.1134/S0031030111060037. S2CID 129045087.
- ^ Berezin, A.Y. (2018). "Craniology of the Plesiosaur Abyssosaurus nataliae Berezin (Sauropterygia, Plesiosauria) from the Lower Cretaceous of the Central Russian Platform". Paleontological Journal. 52 (3): 328–341. doi:10.1134/S0031030118030036. ISSN 0031-0301. S2CID 91151554.
- ^ O'Keefe, FR; Street, HP; Wilhelm, BC; Richards, C; Zhu, H; 2011 "A new skeleton of the cryptoclidid plesiosaur Tatenectes laramiensis reveals a novel body shape among plesiosaurs." Journal of Vertebrate Paleontology. 31 (2): 330–339.
- ^ a b Benson, RBJ; Bowdler, T; 2014 "Anatomy of Colymbosaurus megadeirus (Reptilia: Plesiosauria) from the Kimmeridge Clay Formation of the UK, and high diversity among Late Jurassic plesiosauroids." Journal of Vertebrate Palaeontology. 34 (5): 1053–1071.
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