Seldsienean | |
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Holotype skull | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Suborder: | † Thalattosuchia |
Family: | † Machimosauridae |
Genus: | † Seldsienean Johnson et al., 2020 |
Species: | †S. megistorhynchus |
Binomial name | |
†Seldsienean megistorhynchus (Eudes-Deslongchamps, 1866) | |
Synonyms | |
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Seldsienean (Old English for "seldom seen one") in an extinct genus of machimosaurid thalattosuchian from the Middle Jurassic of England and France. [1] It is known from the Calcaire de Caen and the Cornbrash Formation. [1]
Its type species, S. megistorhynchus, was originally described as a species of Steneosaurus in 1866, [2] but was given its own genus in 2020. [1]
Machimosaurus is an extinct genus of machimosaurid crocodyliform from the Late Jurassic and Early Cretaceous. The type species, Machimosaurus hugii, was found in Switzerland. Other fossils have been found in England, France, Germany, Portugal, Switzerland and Tunisia. Machimosaurus rex is the largest named teleosauroid and thalattosuchian, with an estimated length of approximately 7.2 metres. Machimosaurus is the largest known crocodyliform of the Jurassic.
Streptospondylus is a genus of tetanuran theropod dinosaur known from the Late Jurassic period of France, 161 million years ago. It was a medium-sized predator with an estimated length of 6 meters and a weight of 500 kg (1,100lbs).
Metriorhynchus is an extinct genus of marine crocodyliform that lived in the oceans during the Late Jurassic. The type species, M. brevirostris was named in 1829 as a species of Steneosaurus before being named as a separate genus by the German palaeontologist Christian von Meyer in 1832. The name Metriorhynchus means "Moderate snout", and is derived from the Greek Metrio- ("moderate") and -rhynchos ("snout").
Teleosaurus is an extinct genus of teleosaurid crocodyliform found in the Middle Jurassic Calcaire de Caen of France. It was approximately 3 metres (10 ft) in length. The holotype is MNHN AC 8746, a quarter of a skull. Other fragmentary specimens are known. A single species, T. cadomensis, exists. It was previously considered a wastebasket taxon, with many other remains assigned to the genus.
Plesiosuchus is an extinct genus of geosaurine metriorhynchid crocodyliform known from the Late Jurassic of Dorset, England and possibly also Spain. It contains a single species, Plesiosuchus manselii.
Cricosaurus is an extinct genus of marine crocodyliforms of the Late Jurassic. belonging to the family Metriorhynchidae. The genus was established by Johann Andreas Wagner in 1858 for three skulls from the Tithonian of Germany. The name Cricosaurus means "Ring lizard", and is derived from the Greek Cricos- ("ring") and σαῦρος -sauros ("lizard").
Steneosaurus is a dubious genus of teleosaurid crocodyliform from the Middle or Late Jurassic of France. The genus has been used as a wastebasket taxon for thalattosuchian fossils for over two centuries, and almost all known historical species of teleosauroid have been included within it at one point. The genus has remained a wastebasket, with numerous species still included under the label ‘Steneosaurus’, many of which are unrelated to each other.
Aeolodon is an extinct genus of teleosaurid crocodyliform reptile from the Late Jurassic (Tithonian) of Germany. Although previously synonymized with Steneosaurus, recent cladistic analysis considers it distantly related to the Steneosaurus type species.
Mycterosuchus is an extinct genus of teleosaurid crocodyliform from the Middle Jurassic (Callovian) of England. Although previously synonymized with Steneosaurus, recent cladistic analysis considers it distantly related to the Steneosaurus type species.
Sericodon is an extinct genus of teleosaurid crocodyliform from the Late Jurassic (Tithonian) of Germany and Switzerland. The genus contains a single species, S. jugleri.
Macrospondylus is an extinct genus of machimosaurid teleosauroid crocodyliform from the Early Jurassic (Toarcian) of Europe. Fossils are known from the Posidonia Shale of Germany, the Whitby Mudstone of the United Kingdom, and the "schistes bitumineux" of Luxembourg.
Bathysuchus is an extinct genus of teleosaurid thalattosuchian from Late Jurassic (Kimmeridgian) deep water marine deposits in England and France. Bathysuchus displays features that suggest it was more pelagic than other teleosaurids, including smoother skull bones and reduced armour plating, similar to the fully marine metriorhynchids. This was possibly an adaptation to rising sea levels during the Kimmeridgian, as its earlier relatives such as Teleosaurus were suited for shallow coasts and lagoon environments.
Lemmysuchus is a genus of machimosaurid thalattosuchian from the Middle Jurassic Callovian of England and France. Like many other teleosauroids from Europe, it has had a convoluted taxonomic history.
Indosinosuchus is a genus of teleosaurid neosuchian that lived during the Late Jurassic in what is now Thailand. It contains two species, the type species I. potamosiamensis and I. kalasinensis, both recovered from the lower Phu Kradung Formation. The age of Indosinosuchus is unclear, as vertebrate fossils like Indosinosuchus support a Late Jurassic age, while palynological data suggests an Early Cretaceous (Berriasian) age.
Plagiophthalmosuchus is a genus of teleosauroid, known form the Early Jurassic Whitby Mudstone Formation of Whitby, Yorkshire, UK, and Dudelange, Luxembourg. The type species, P. gracilirostris, was originally named as a species of Teleosaurus in 1836, but then it was moved to Steneosaurus in 1961, but it was again moved to its own genus in 2020.
Neosteneosaurus is a genus of machimosaurid, known form the Middle Jurassic Oxford Clay of the UK, and Marnes de Dives, France. The type species, N. edwardsi, was originally named as a species of Steneosaurus in 1868, but was moved to its own genus in 2020. Steneosaurus durobrivensis and Steneosaurus hulkei are considered junior synonyms.
Andrianavoay is an extinct genus of teleosauroid from the Bathonian Kandreho Formation of Madagascar.
Charitomenosuchus is an extinct genus of machimosaurid teleosauroid from the Callovian Oxford Clay Formation of England.
Clovesuurdameredeor is an extinct genus of machimosaurid teleosauroid from the Bathonian Cornbrash Formation of England.
Proexochokefalos is an extinct genus of machimosaurid teleosauroid from the Jurassic of France