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Thalassochelydia
Thalassochelydia is a clade of extinct marine turtles from the Late Jurassic and earliest Cretaceous of Europe and South America. The group is defined as including '' Eurysternum'', ''Plesiochelys'' and '' Thalassemys'' to the exclusion of '' Pelomedusa'', '' Testudo'' and '' Protostega''. While a clade uniting the families Eurysternidae, Plesiochelyidae and Thalassemydidae had been supported by phylogenetic evidence, a name was not given for the clade until 2017, when Jérémy Anquetin and colleagues coined Thalassochelydia. While inner relationships of the clade are so uncertain as to make the monophyly of the families questionable, the significant diversity of thalassochelydians makes using the potentially invalid terms useful to describe the different morphologies. The monophyly of Thalassochelydia was further supported by a later analysis by Serjocha Evers and Roger Benson in 2019, where the group, represented by '' Solnhofia'' and Plesiochelyidae was sister taxon to Sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angolachelonia
Angolachelonia is a clade of extinct turtles from the Late Jurassic to Paleogene of Eurasia. The group is defined as all taxa derived from the ancestor of the type genus ''Angolachelys'' and ''Solnhofia'', a definition that could potentially encompass a clade of entirely marine turtles. Angolachelonia was originally inclusive of only ''Solnhofia'', ''Angolachelys'' and ''Sandownia'' when originally conceived by Octavio Mateus and colleagues in 2009 in paleontology, 2009, but later phylogenetic analyses by Serjocha Evers and Roger Benson in 2018 in paleontology, 2018 unites the family Sandownidae, including ''Angolachelys'' and ''Sandownia'' among other taxa, with the entirely Late Jurassic clade Thalassochelydia, where ''Solnhofia'' may be a basal member. While the placement of ''Solnhofia'' is weak and the clade that Angolachelonia represents may change with further analysis, the clade of Sandownidae and Thalassochelydia is well-supported, and does not collapse despite the uncerta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plesiochelyidae
The Plesiochelyidae are an extinct family of turtles in the clade Thalassochelydia originally classified within the Cryptodira suborder, mostly belonging from the Jurassic period. An alternate study placed the clade Thalassochelydia in the Angolachelonia and outside the Testudines Turtles are reptiles of the order (biology), order Testudines, characterized by a special turtle shell, shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Crypt ....Evers, S. W., & Benson, R. B. (2019). A new phylogenetic hypothesis of turtles with implications for the timing and number of evolutionary transitions to marine lifestyles in the group. Palaeontology, 62(1), 93-134. References Thalassochelydia Late Jurassic turtles † {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandownidae
Sandownidae is a family of extinct marine turtles from the Cretaceous and Paleogene distributed around the Atlantic Ocean and adjacent areas. The family is defined as all taxa closer to the type genus '' Sandownia'' than to '' Pelomedusa'', '' Testudo'', '' Solnhofia'', '' Eurysternum'', ''Plesiochelys'', '' Thalassemys'' or ''Protostega'', a definition that encompasses the previous concept of the clade while also excluding it from being synonymous with other clades of modern or extinct marine turtles. Sandownidae may be within the larger clade Angolachelonia, defined as inclusive of ''Angolachelys'' and ''Solnhofia'', sister to the entirely Late Jurassic marine group Thalassochelydia, although the concepts of the clades may shift with further phylogenetic analysis. Genera * '' Sandownia'' Meylan et al. 2000 Atherfield Clay Formation, England, Early Cretaceous (Aptian) * '' Brachyopsemys'' Tong and Meylan 2013 Ouled Abdoun Basin, Morocco, Paleocene (Danian) * ''Angolachelys'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurysternidae
Eurysternidae is an extinct family of turtle Turtles are reptiles of the order (biology), order Testudines, characterized by a special turtle shell, shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Crypt ...s in the clade Thalassochelydia. It consists of several genera of marine turtles from marine deposits in Europe, including '' Achelonia'', '' Chelonides'', '' Eurysternum''. '' Hydropelta'', '' Chelonides'', '' Idiochelys'', '' Palaeomedusa'', '' Parachelys''. and '' Solnhofia''. References Thalassochelydia † Late Jurassic turtles Late Jurassic reptiles of Europe Taxa named by Louis Dollo {{paleo-turtle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptodira
The Cryptodira (') are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira is commonly called the "Hidden-Neck Turtles" or the "Inside-Neck Turtles". Cryptodira differ from Pleurodira (side-necked turtles) in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells' marginals. They include among their species freshwater turtles, snapping turtles, tortoises, softshell turtles, and sea turtles. Neck retraction The Cryptodira are characterized by retraction of the head in the vertical plane, which permits for primarily vertical movements and restricted lateral movements outside of the shell. These motions are largely due to the morphology and arrangement of cervical vertebrae. In all recent turtles, the cervical column consists of nine joints and eight vertebrae. Compared to the narrow vertebrae and the closely positioned zygapophyses of the pleur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aplax
''Aplax'' is a dubious genus of extinct thalassochelydian turtle from the Late Jurassic of Germany. The type and only species is ''Aplax oberndorferi'', named by Hermann von Meyer in 1843 for a complete juvenile skeleton from the early Tithonian of the Solnhofen Formation in Bavaria. Despite being aware that shell morphology changes during growth, Meyer named ''Aplax'' due to his consideration it represented a relative of '' Dermochelys'', where the adults lack distinction of shell regions as in ''Aplax''. However the taxon was later referred to Thalassochelydia by Anquetin and colleagues in 2017, and due to the loss of the original holotype it cannot be identified as a distinct taxon of a juvenile of existing Solnhofen turtles and is therefore a ''nomen dubium In binomial nomenclature, a ''nomen dubium'' (Latin for "doubtful name", plural ''nomina dubia'') is a scientific name that is of unknown or doubtful application. Zoology In case of a ''nomen dubium,'' it may be impossi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solnhofia
''Solnhofia'' is a genus of extinct thalassochelydian turtle from the Late Jurassic of Germany. The type species is ''Solnhofia parsonsi'', named by Gaffney in 1975 for a partial skull and jaw from the early Tithonian of the Solnhofen Formation in Bavaria. Additional material including a complete skeleton is known from the late Kimmeridgian of Switzerland and the Kimmeridgian/Tithonian of other deposits within Bavaria, and potentially also unprepared material from the Late Jurassic of France. The genus was referred to the family Eurysternidae by Anquetin and colleagues in 2017 2017 was designated as the International Year of Sustainable Tourism for Development by the United Nations General Assembly. Events January * January 1 – Istanbul nightclub shooting: A gunman dressed as Santa Claus opens fire at the ..., which may represent an artificial grade of early thalassochelydians. In 2020 a new species ''Solnhofia brachyrhyncha'' was described from the Kimmeridigan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euryaspis
''Euryaspis'' is a dubious genus of extinct thalassochelydian turtle from the Late Jurassic of Germany. The type and only species is ''Euryaspis radians'', originally proposed by Wagner in 1859 before being validly described and illustrated in 1861. The only specimen was a partial carapace probably from the Tithonian, although the original locality is unknown. The genus is referred to Thalassochelydia and has been considered a synonym of '' Eurysternum'' or '' Acichelys'' before, but casts that remain of the lost holotype show that it bears no features that can clarify its validity making it a ''nomen dubium In binomial nomenclature, a ''nomen dubium'' (Latin for "doubtful name", plural ''nomina dubia'') is a scientific name that is of unknown or doubtful application. Zoology In case of a ''nomen dubium,'' it may be impossible to determine whether a ...''. References {{Taxonbar, from=Q96377472 Thalassochelydia Prehistoric turtle genera Tithonian genera Late Jurassic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalassemys
''Thalassemys'' is a genus of extinct thalassochelydian turtle from the Late Jurassic of western and central Europe. While the genus was originally named by Rütimeyer in 1859 for a large carapace and other associated fragments from the late Kimmeridgian of the Reuchenette Formation of Switzerland, although the taxon was not validly named until 1873 when Rütimeyer designated the type species ''T. hugii''. Rütimeyer also named ''T. gresslyi'' from the Reunchenette Formation in the same paper as ''T. hugii'', but it cannot be differentiated from the type material of ''T. hugii'' and is therefore a junior synonym. A large assemblage of shell and postcranial material from the Reunchenette was named as a species of '' Eurysternum'', ''E. ignoratum'', by Bräm in 1965. While originally distinguished based on the presence of fontanelles on the plastron, the feature was later identified on ''T. hugii'' and ''E. ignoratum'' was designated a junior synonym. Additional material from the K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalassemydidae
''Thalassemys'' is a genus of extinct thalassochelydian turtle from the Late Jurassic of western and central Europe. While the genus was originally named by Rütimeyer in 1859 for a large carapace and other associated fragments from the late Kimmeridgian of the Reuchenette Formation of Switzerland, although the taxon was not validly named until 1873 when Rütimeyer designated the type species ''T. hugii''. Rütimeyer also named ''T. gresslyi'' from the Reunchenette Formation in the same paper as ''T. hugii'', but it cannot be differentiated from the type material of ''T. hugii'' and is therefore a junior synonym. A large assemblage of shell and postcranial material from the Reunchenette was named as a species of '' Eurysternum'', ''E. ignoratum'', by Bräm in 1965. While originally distinguished based on the presence of fontanelles on the plastron, the feature was later identified on ''T. hugii'' and ''E. ignoratum'' was designated a junior synonym. Additional material from the Ki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Owadowia
''Owadowia'' is a genus of extinct thalassochelydian turtle from the Late Jurassic of Poland. The type and only species is ''Owadowia borsukbialynickae'', named by Szczygielski and colleagues in 2017 for a partial lower jaw, coracoid, ilium and femur from the early Tithonian Kcynia Formation Kcynia () is a town in Nakło County, Kuyavian-Pomeranian Voivodeship, in north-central Poland, with 4,702 inhabitants (2010). It is located in the Pałuki ethnographic region in the northern part of historic Greater Poland. History Kcynia start .... The limited material means that it is difficult to compare ''Owadowia'' to its relatives, and it may not be a unique taxon. The genus lacks the features diagnostic to its parent clade Thalassochelydia, has similarities to '' Solnhofia'' and '' Portlandemys'' as well as being a Late Jurassic marine turtle like the remainder of the group. References Thalassochelydia Prehistoric turtle genera Tithonian genera Late Jurassic turtles Late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurysternum
''Eurysternum'' is an extinct genus of thalassochelydian turtle. Its type species is ''Eurysternum wagleri'', the holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ... of which has since been lost and only survives in illustrations. Formerly assigned species ''Eurysternum ignoratum'' Bram, 1965 is a junior synonym of '' Thalassemys hughii''. The Late Jurassic species ''Eurysternum neuquinum'' Fernandez and de la Fuente, 1988, described from marine deposits in Argentina, is now placed in its own genus '' Neusticemys''.M. S. Fernandez and M. S. de la Fuente. 1993. Las tortugas casiquélidias de las calizas litográficas titonianas del área Los Catutos Argentina. Ameghiniana 30(3):283-295. References Thalassochelydia Prehistoric turtle genera Kimmeridgian genera L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
