Stratesaurus is known from the holotype specimen OUMNH J.10337, a dorsoventrally crushed but nearly complete skull, and three-dimensionally preserved partial postcranialskeleton including anterior cervical and pectoral vertebrae, a partial hindlimb and ilium. GSM 26035 was referred to S. taylori because it shares one autapomorphy and other characters with the holotype specimen. It consists of a skull and some anterior cervical vertebrae. AGT 11 was also referred to S. taylori. Although it does nor show the autapomorphies of S. taylori, it is indistinguishable from both OUMNH J.10337 and GSM 26035, and it is possible to distinguish it from similar taxa, like Avalonnectes. All specimens were collected at Street, of Somerset, from the Pre-Planorbis beds of the Blue Lias Formation of the Lower Lias Group. These beds likely occur below the first occurrence of the ammonite Psiloceras planorbis. Thus, they probably fall within the earliest Hettangian P. tilmanni Chronozone, which is about 199.6-198 million years old, immediately following the Triassic–Jurassic Boundary. Plesiosaurs fossils which were discovered at Street represent the earliest known occurrence of the Plesiosauria. Hence, Stratesaurus is one of the oldest plesiosaurs to date.[1]
Description
Stratesaurus is a small-bodied rhomaleosaurid with fivebasalmost rhomaleosaurid. The cladogram below shows Stratesaurus phylogenetic position among other plesiosaurs following Benson et al. (2012).[1]
Stratesaurus was first described and named by Roger B. J. Benson, Mark Evans and Patrick S. Druckenmiller in 2012 and the type species is Stratesaurus taylori. The generic name is derived from "Strate", the name for Street as it recorded in the Domesday Book and from Greeksauros, meaning "lizard". The specific name honors the paleontologist Michael A. Taylor, who performed acid preparation of the holotype.[1]
^ abcdeRoger B. J. Benson, Mark Evans and Patrick S. Druckenmiller (2012). "High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic Boundary". PLOS ONE. 7 (3). e31838. Bibcode:2012PLoSO...731838B. doi:10.1371/journal.pone.0031838. PMC3306369. PMID 22438869.{{cite journal}}: CS1 maint: uses authors parameter (link)
^Roger B J. Benson; Mark Evans; Michael A. Taylor (2015). "The anatomy of Stratesaurus (Reptilia, Plesiosauria) from the lowermost Jurassic of Somerset, United Kingdom". Journal of Vertebrate Paleontology. 35 (4). e933739. doi:10.1080/02724634.2014.933739.
February 23, 2023
stratesaurus, extinct, genus, small, bodied, rhomaleosaurid, plesiosaur, known, from, early, jurassic, period, most, likely, earliest, hettangian, stage, united, kingdom, contains, single, species, taylori, small, plesiosaur, with, skull, length, body, length,. Stratesaurus is an extinct genus of small bodied rhomaleosaurid plesiosaur known from the Early Jurassic period most likely earliest Hettangian stage of the United Kingdom It contains a single species S taylori 1 It was a small plesiosaur with a skull length of 18 cm 7 1 in and a body length of 2 m 6 6 ft 1 2 StratesaurusTemporal range Early Jurassic 199 6 198 Ma PreꞒ Ꞓ O S D C P T J K Pg N Holotype of Stratesaurus tayloriScientific classificationKingdom AnimaliaPhylum ChordataClass ReptiliaSuperorder SauropterygiaOrder PlesiosauriaFamily RhomaleosauridaeGenus StratesaurusBenson Evans amp Druckenmiller 2012Type species Stratesaurus tayloriBenson Evans amp Druckenmiller 2012 Contents 1 Discovery 2 Description 3 Etymology 4 See also 5 ReferencesDiscovery EditStratesaurus is known from the holotype specimen OUMNH J 10337 a dorsoventrally crushed but nearly complete skull and three dimensionally preserved partial postcranial skeleton including anterior cervical and pectoral vertebrae a partial hindlimb and ilium GSM 26035 was referred to S taylori because it shares one autapomorphy and other characters with the holotype specimen It consists of a skull and some anterior cervical vertebrae AGT 11 was also referred to S taylori Although it does nor show the autapomorphies of S taylori it is indistinguishable from both OUMNH J 10337 and GSM 26035 and it is possible to distinguish it from similar taxa like Avalonnectes All specimens were collected at Street of Somerset from the Pre Planorbis beds of the Blue Lias Formation of the Lower Lias Group These beds likely occur below the first occurrence of the ammonite Psiloceras planorbis Thus they probably fall within the earliest Hettangian P tilmanni Chronozone which is about 199 6 198 million years old immediately following the Triassic Jurassic Boundary Plesiosaurs fossils which were discovered at Street represent the earliest known occurrence of the Plesiosauria Hence Stratesaurus is one of the oldest plesiosaurs to date 1 Description EditStratesaurus is a small bodied rhomaleosaurid with fivebasalmost rhomaleosaurid The cladogram below shows Stratesaurus phylogenetic position among other plesiosaurs following Benson et al 2012 1 Plesiosauria Neoplesiosauria PliosauridaePlesiosauroidea Rhomaleosauridae Stratesaurus tayloriMacroplata tenuicepsAvalonnectes arturiEurycleidus arcuatusMeyerasaurus victorMaresaurus coccaiAtychodracon megacephalusArchaeonectrus rostratusRhomaleosaurus cramptoniRhomaleosaurus thorntoniRhomaleosaurus zetlandicusEtymology EditStratesaurus was first described and named by Roger B J Benson Mark Evans and Patrick S Druckenmiller in 2012 and the type species is Stratesaurus taylori The generic name is derived from Strate the name for Street as it recorded in the Domesday Book and from Greek sauros meaning lizard The specific name honors the paleontologist Michael A Taylor who performed acid preparation of the holotype 1 See also Edit Paleontology portalList of plesiosaur genera Timeline of plesiosaur researchReferences Edit a b c d e Roger B J Benson Mark Evans and Patrick S Druckenmiller 2012 High Diversity Low Disparity and Small Body Size in Plesiosaurs Reptilia Sauropterygia from the Triassic Jurassic Boundary PLOS ONE 7 3 e31838 Bibcode 2012PLoSO 731838B doi 10 1371 journal pone 0031838 PMC 3306369 PMID 22438869 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint uses authors parameter link Roger B J Benson Mark Evans Michael A Taylor 2015 The anatomy of Stratesaurus Reptilia Plesiosauria from the lowermost Jurassic of Somerset United Kingdom Journal of Vertebrate Paleontology 35 4 e933739 doi 10 1080 02724634 2014 933739 Retrieved from https en wikipedia org w index php title Stratesaurus amp oldid 1134408275, wikipedia, wiki, book, books, library,
