Dinosaurs of the United Kingdom

Baryonyx () is a genus of theropod dinosaur which lived in the Barremian stage of the Early Cretaceous period, about 130–125 million years ago. The first skeleton was discovered in 1983 in the Smokejack Clay Pit, of Surrey, England, in sediments of the Weald Clay Formation, and became the holotype specimen of Baryonyx walkeri, named by palaeontologists Alan J. Charig and Angela C. Milner in 1986. The genus name Baryonyx comes from Ancient Greek βαρύς (barús), meaning "heavy" or "strong", and ὄνυξ (ónux), meaning "claw", alluding to the animal's very large claw on the first finger; the specific

Megalosaurus (meaning "great lizard", from Greek , '''', meaning 'big', 'tall' or 'great' and , '''', meaning 'lizard') is an extinct genus of large carnivorous theropod dinosaurs of the Middle Jurassic Epoch (Bathonian stage, 166 million years ago) of southern England. Although fossils from other areas have been assigned to the genus, the only certain remains of Megalosaurus come from Oxfordshire and date to the late Middle Jurassic.

Hypsilophodon (; meaning "high-crested tooth") is a neornithischian dinosaur genus from the Early Cretaceous period of England. It has traditionally been considered an early member of the group Ornithopoda, but recent research has put this into question.

Scelidosaurus (; with the intended meaning of "limb lizard", from Greek / meaning 'rib of beef' and sauros/ meaning 'lizard') is a genus of herbivorous armoured ornithischian dinosaur from the Jurassic of England.

Acanthopholis (; meaning "spiny scales") is a genus of ankylosaurian dinosaur in the family Nodosauridae that lived during the Late Cretaceous Period of England. A single species, A. horrida, exists.

Thecodontosaurus ("socket-tooth lizard") is a genus of herbivorous basal sauropodomorph dinosaur that lived during the late Triassic period (Carnian age). Its remains are known mostly from Triassic "fissure fillings" in southern England. Thecodontosaurus was a small bipedal animal, about long. It is one of the first dinosaurs to be discovered and is one of the oldest that ever existed. Many species have been named within the genus, but only the type species Thecodontosaurus antiquus is seen as valid today.

Cetiosaurus ( meaning 'whale lizard', from the Greek ''''/ meaning 'sea monster' (later, 'whale') and ''''/ meaning 'lizard'), is a genus of herbivorous sauropod dinosaur from the Middle Jurassic Period, living about 171 to 165 million years ago during the Bajocian and Bathonian ages in what is now Britain and probably France.

Polacanthus (from the Ancient Greek polys-/πολύς- "many" and akantha/ἄκανθα "thorn" or "prickle") is an extinct genus of ankylosaurian dinosaurs from the early Cretaceous (130–125 million years ago) of England. Several species have been named in the genus Polacanthus, but only the type species, Polacanthus foxii, is currently seen as valid. There are not many fossil remains of this dinosaur, and some important anatomical features, such as its skull, are poorly known. It grew to about long. Its body was covered with armour plates and spikes. It may be a basal member of the Nodosauridae or part

Eustreptospondylus ( ;), from (Ancient Greek εὖ (eû), meaning "well", στρεπτός (streptós), meaning "twisted", and σπόνδυλος (spóndulos), meaning "vertebra"), is an extinct genus of megalosaurid theropod dinosaur, from the Callovian and Oxfordian stages of the Jurassic period (some time between 166 and 154 million years ago) in southern England, at a time when Europe was a series of scattered islands (due to tectonic movement at the time which raised the sea-bed and flooded the lowland).

Dacentrurus (meaning "tail full of points") is an extinct genus of stegosaurian dinosaur from the Late Jurassic and perhaps Early Cretaceous (154–140 million years ago) of Europe. Its type species, D. armatus, was named in 1875 as Omosaurus armatus, based on a skeleton found in a clay pit in the Kimmeridge Clay in Swindon, England. In 1902 the genus was renamed Dacentrurus because the name Omosaurus had already been used for a phytosaur in 1856. After 1875, half a dozen other species would be named but perhaps only Dacentrurus armatus is valid.

Proceratosaurus ( ) is a genus of theropod dinosaur that lived during the Middle Jurassic in what is now England. The holotype and only known specimen consists of a mostly complete skull with an accompanying lower jaw and a bone, found near Minchinhampton, a town in Gloucestershire. It was originally described in 1910 as a species of Megalosaurus, M. bradleyi, but was moved to its own genus, Proceratosaurus, in 1926. The genus was named for its supposed close relationship with Ceratosaurus, later shown to be erroneous, due to perceived resemblance of Proceratosaurus incomplete cranial cre

Hylaeosaurus ( ) is a herbivorous ankylosaurian dinosaur that lived about 136 million years ago, in the late Valanginian stage of the early Cretaceous period of England. It was found in the Grinstead Clay.

Neovenator (nˈiːə͡ʊvˌɛne͡ɪtə; "new hunter") is an extinct genus of carcharodontosaurian theropod dinosaur. It is known primarily from several skeletons found in the Early Cretaceous (Hauterivian–Barremian) Wessex Formation on the south coast of the Isle of Wight, southern England. The first remains of Neovenator were discovered in 1978 alongside those of the ornithopod Brighstoneus, after the collapse of part of Grange Chine. In 1996, Steve Hutt, David Martill and Michael Barker named the genus Neovenator. One species is known: the type species, N. salerii, after the Salero family who owned th

Metriacanthosaurus (meaning "moderately-spined lizard") is a genus of metriacanthosaurid dinosaur from the Oxford Clay Formation of England, dating to the Late Jurassic period, about 160 million years ago (lower Oxfordian). It is the only metriacanthosaurid currently named from outside of Asia.

Eotyrannus (meaning "dawn tyrant") is a genus of tyrannosauroid theropod dinosaur hailing from the Early Cretaceous Wessex Formation beds, included in Wealden Group, located in the southwest coast of the Isle of Wight, United Kingdom. The remains (MIWG1997.550), consisting of assorted skull, axial skeleton and appendicular skeleton elements, from a juvenile or subadult, found in a plant debris clay bed, were described by Stephen Hutt and colleagues in early 2001. The etymology of the generic name refers to the animal's classification as an early tyrannosaur or "tyrant lizard", while the specif

Sarcosaurus () is a genus of basal neotheropod dinosaur, roughly long. It lived in what is now England and maybe Ireland and Scotland during the Hettangian-Sinemurian stages of the Early Jurassic, about 199-196 million years ago. Sarcosaurus is one of the earliest known Jurassic theropods, and one of only a handful of theropod genera from this time period. Along with Dracoraptor hanigani it is one of the two described neotheropods from the lowermost Jurassic of the United Kingdom.

Lexovisaurus is a genus of stegosaurian dinosaur known from limb bones and armor fragments from Middle to Late Jurassic-aged strata of Europe.

Gigantosaurus () is a dubious genus of sauropod dinosaur from the Late Jurassic Kimmeridge Clay Formation of England. The type species, Gigantosaurus megalonyx, was named and described by Harry Govier Seeley in 1869.

Yaverlandia (meaning "of Yaverland Point/Yaverland Battery") is an extinct genus of possible dinosaur known from two partial fossil skulls found in Lower Cretaceous strata of the Wessex Formation (Upper Silty Bed) in the Isle of Wight, England. When the first known specimen, MIWG 1530, was first described in 1930 by D. M. S. Watson, similarities were noted with the ornithopod genus Vectisaurus (now Mantellisaurus) and the theropod genus Troodon. In 1936, it was ultimately assigned to the former. It was recognised as a distinct genus in 1971 by Peter Galton, who re-examined the remains. Galton

Aristosuchus (from the Ancient Greek ἄριστος, meaning "bravest, best, noblest", and σουχος, the Ancient Greek corruption of the name of the Egyptian crocodile-headed god Sobek) is a genus of small coelurosaurian dinosaur that lived in the Early Cretaceous period (Barremian stage, sometime between 130 and 123 million years ago) of what is now England, UK. The type and only species is Aristosuchus pusillus, originally referred to the carnosaurian genus Poekilopleuron.

Altispinax (; "with high spines") is a genus of large predatory theropod dinosaur from the Early Cretaceous period (Valanginian, 140 to 133 million years ago) of what is now the Wadhurst Clay Formation of East Sussex, England.

Pelorosaurus ( ; meaning "monstrous lizard") is a genus of titanosauriform sauropod dinosaur. Remains referred to Pelorosaurus date from the Early Cretaceous period, about 140–125 million years ago, and have been found in England. Thomas Holtz estimated its length at . The name Pelorosaurus was one of the first to be given to any sauropod. Many species have been assigned to the genus historically, but most are currently considered to belong to other genera. Problematically, the first named species of Pelorosaurus, P. conybeari, is a junior synonym of Cetiosaurus brevis (now Pelorosaurus brevis

Cetiosauriscus ( ) is a genus of sauropod dinosaur that lived between 166 and 164 million years ago during the Callovian (Middle Jurassic Period) in what is now England. A herbivore, Cetiosauriscus had – by sauropod standards – a moderately long tail, and longer forelimbs, making them as long as its hindlimbs. It has been estimated as about long and between in weight.

Echinodon is a genus of heterodontosaurid dinosaur that lived during the earliest Cretaceous of southern England and possibly western France in the Berriasian epoch. The first specimens were jaw bones named Echinodon becklesii by Sir Richard Owen in 1861, and since their original description only additional teeth have been discovered. The specific name honours collector Samuel Beckles who discovered the material of Echinodon and many other taxa from across England, while the genus name translates as "prickly tooth" in reference to the dental anatomy of the taxon.

Duriavenator is a genus of theropod dinosaur that lived in what is now England during the Middle Jurassic, about 168 million years ago. In 1882, upper and lower jaw bones of a dinosaur were collected near Sherborne in Dorset, and Richard Owen considered the fossils to belong to the species Megalosaurus bucklandii, the first named non-bird dinosaur. By 1964, the specimen was recognised as belonging to a different species, and in 1974 it was described as a new species of Megalosaurus, M. hesperis; the specific name means 'the West' or 'western'. Later researchers questioned whether the species b

Bothriospondylus (from Ancient Greek βοθρίον (bothríon), meaning "trench", and σπόνδυλος (spóndulos), meaning "vertebra") is a dubious genus of possibly neosauropodan sauropod dinosaur. It lived during the Late Jurassic in England and the type (and only) species is B. suffossus.

Juratyrant (meaning "Jurassic tyrant") is a genus of tyrannosauroid dinosaur from the late Jurassic period (early Tithonian age) of England. The genus contains a single species, Juratyrant langhami, which was once classified as a species of Stokesosaurus.

Valdosaurus ("Weald lizard") is a genus of bipedal herbivorous dryosaurid dinosaur known from the Early Cretaceous of the Isle of Wight and elsewhere in England. Originally its remains were believed to belong to Hypsilophodon. In 1889, Richard Lydekker assigned them to Camptosaurus, alongside a partial lower jaw, and applied the name Camptosaurus valdensis. In the 1970s, Peter Galton reassigned these remains to a new species of Dryosaurus, then to an entirely new genus and species, that being Valdosaurus proper. The type and only species of Valdosaurus, named by Galton, is V. canaliculatus.

Barilium is a genus of iguanodontian dinosaur which was first described as a species of Iguanodon (I. dawsoni) by Richard Lydekker in 1888, the specific epithet honouring the discoverer Charles Dawson, who collected the holotype during the 1880s. thumb|upright|left|Middle dorsal vertebra In 2010 it was reclassified as a separate genus by David Norman. The generic name Barilium is derived from Greek barys, "heavy", and Latin ilium. Later in 2010, Kenneth Carpenter and Yusuke Ishida independently assigned it to the new genus Torilion, which is thus a junior objective synonym of Barilium. It is

Callovosaurus (meaning "Callovian lizard") is a genus of iguanodontian dinosaur known from most of a left thigh bone discovered in Middle Jurassic-age rocks of England. At times, it has been considered dubious or a valid genus of basal iguanodontian, perhaps a dryosaurid.

Agnosphitys (; "unknown begetter"; sometimes mistakenly called Agnostiphys or Agnosphytis) is a genus of dinosauriform that lived during the Late Triassic. It contains only one species, the type species A. cromhallensis. Its remains include an ilium, maxilla, astragalus and humerus, which date variously from the Norian and Rhaetian stages of the Late Triassic, or possibly as late as the Hettangian stage of the Early Jurassic. The fissure fill at Avon, of which Agnosphitys was probably recovered from, was a sinkhole formed by the dissolution of Lower Carboniferous limestones.

Iliosuchus (meaning "crocodile-hipped") is a genus of theropod dinosaur known from Bathonian–age (168.3 – 166.1 mya) rocks of England. It was perhaps long.

Nuthetes is a genus of coelurosaurian theropod dinosaur, either a dromaeosaurid or tyrannosauroid, known only from fossil teeth and jaw fragments found in rocks of the middle Berriasian age (Early Cretaceous) in the Cherty Freshwater Member of the Lulworth Formation in England and also the Angeac-Charente bonebed in France. If it was a dromaeosaurid, Nuthetes would have been a small predator.

Ornithodesmus (meaning "bird link") is a genus of small, dromaeosaurid dinosaur from the Isle of Wight in England, dating to about 125 million years ago. The name, along with that of the type and only species, O. cluniculus, was originally assigned to a bird-like sacrum (a series of vertebrae fused to the hip bones), initially believed to come from a bird and subsequently identified as a pterosaur. More complete pterosaur remains were later assigned to Ornithodesmus. More recently, a detailed analysis determined that the original specimen in fact came from a small theropod, specifically a drom

Anoplosaurus (meaning "unarmored or unarmed lizard") is an extinct genus of herbivorous nodosaurid dinosaur from the Lower Cretaceous (late Albian age) Cambridge Greensand of Cambridgeshire, England. It has in the past been classified with either the armored dinosaurs or the ornithopods, but current thought has been in agreement with the "armored dinosaur" interpretation, placing it in the Ankylosauria.

Magnosaurus (meaning 'large lizard') was a genus of theropod dinosaur from the Middle Jurassic of England. It is based on fragmentary remains and has often been confused with or included in Megalosaurus.

Dracoraptor (meaning "dragon thief") is a genus of coelophysoid dinosaur that lived during the Hettangian stage of the Early Jurassic Period of what is now Wales dated at about 201 million years ago. The fossil was first discovered in 2014 by Rob and Nick Hanigan and Sam Davies at the Blue Lias Formation on the South Wales coast. The genus name Dracoraptor is from Draco, referring to the Welsh dragon, and raptor, meaning robber, a commonly employed suffix for theropod dinosaurs, with the type species being Dracoraptor hanigani. It is one of the oldest known Jurassic dinosaurs and is the first

Hypselospinus is a genus of iguanodontian dinosaur which was first described as a species of Iguanodon (I. fittoni) by Richard Lydekker in 1889, the specific name honouring William Henry Fitton.

Cruxicheiros (meaning "cross hand") is a genus of theropod dinosaur which lived in the Middle Jurassic of England. The type species is C. newmanorum, described by Roger Benson and Jonathan Radley in 2010.

Sarcolestes (from Ancient Greek σάρξ (sárx), meaning "flesh", and λῃστής (lēistḗs), meaning "robber", and thus, "flesh robber") is an extinct genus of ankylosaurian ornithischian dinosaur from the Oxford Clay of England. The current type and only species is S. leedsi, and the holotype is a single partial left mandible. The genus and species were named in 1893 by Richard Lydekker, who thought they belonged to a theropod.

Agrosaurus (; perhaps from Greek agros meaning 'field' and sauros meaning 'lizard', "field lizard") is a potentially dubious genus of thecodontosaurid sauropodomorph probably originating from the Magnesian Conglomerate of England that was originally believed to be a Triassic prosauropod from Australia. Agrosaurus would thus be the oldest dinosaur from that country. However, this appears to have been an error, and the material actually appears to come from Thecodontosaurus or a Thecodontosaurus-like animal from Bristol, England (Avon Fissure Fill). The type species is Agrosaurus macgillivrayi.

Camelotia (meaning "from Camelot") is a large-bodied sauropodomorph from the latest Triassic (Rhaetian) of southwest England. It is best known from a partial postcranial skeleton found in the Westbury Formation and named by Peter M. Galton in 1985. Subsequent work has generally placed Camelotia as a relatively derived sauropodomorph close to the origin of Sauropoda, although its exact position among early non-sauropod sauropodomorphs remains debated. It is sometimes placed in Melanorosauridae as a close relative of Melanorosaurus. With a body length and mass estimated at and , respectively, it

Ceratosuchops (meaning "horned crocodile face") is a genus of spinosaurid from the Early Cretaceous (Barremian) Wessex Formation of Britain. The type species is C. inferodios, known from skull fragments (a snout tip and a partial braincase) recovered between 2013–2017 from Chilton Chine on the Isle of Wight, and housed at the Dinosaur Isle Museum in Sandown. It was named in 2021 by a team consisting of Chris Tijani Barker, Darren Naish, David W. E. Hone, and colleagues, alongside Riparovenator milnerae.

Suchosaurus (meaning "crocodile lizard") is a dubious genus of large theropod dinosaur that lived during the Early Cretaceous in what is now Europe. The type species, S. cultridens, was originally described in 1841 by Richard Owen based on a chimeric assemblage of fossil teeth and vertebrae discovered in the Tilgate Forest, of Sussex, England, in sediments of the Wealden Supergroup. The second species, S. girardi, was established in 1897 by Henri Émile Sauvage from a tooth and fragmentary jaw material recovered from the Papo Seco Formation in Portugal. Initially interpreted as a crocodilian fo

Pantydraco (where "panty-" is short for Pant-y-ffynnon, signifying hollow of the spring/well in Welsh, referring to the quarry at Bonvilston in South Wales where it was found) is a genus of basal sauropodomorph dinosaur from the Late Triassic of the United Kingdom (Wales). It is based on a partial juvenile skeleton once thought to belong to Thecodontosaurus. Only one valid species of Pantydraco is recognised: P. caducus.

Regnosaurus (meaning "Sussex lizard") is an extinct genus of herbivorous presumably armored dinosaur known from the early Cretaceous Wealden Formation of England. The genus contains a single species, Regnosaurus northamptoni, known from a single partial jaw bone. Regnosaurus has traditionally been regarded as a stegosaur, possibly related to the Jurassic Huayangosaurus of China. Later research considers it to be a dubious, indeterminate thyreophoran.

Newtonsaurus is an extinct genus of possibly coelophysoid theropod dinosaur from the Late Triassic (Rhaetian) Lilstock Formation of South Wales, Great Britain. The genus contains a single species, Newtonsaurus cambrensis, originally named as a species of Zanclodon, known from an external mould of the front half of a lower jaw. With an estimated total length of , it is suggested to have been one of the largest theropods known from the Triassic.

Craterosaurus (meaning krater reptile or bowl reptile) is a dubious genus of stegosaurian dinosaur that lived during the Early Cretaceous (possibly Aptian stage) of the Woburn Sands Formation of England. Estimated to measure around in length and weighing approximately , Craterosaurus may actually be a junior synonym of Regnosaurus, but only one fossil, a partial vertebra, was recovered.

Calamosaurus (meaning "reed lizard") is a genus of small theropod dinosaur, from the Early Cretaceous of the Isle of Wight, England. It is based on two cervical vertebrae (NHMUK PV R 901), collected by Reverend William Fox. These fossils come from sedimentary rocks of the Wessex Formation and are Barremian in age. The type species of Calamosaurus, named Calamospondylus foxi by Richard Lydekker, was named in honour of Fox. Calamospondylus, however, was a preoccupied name, forcing Lydekker to change the genus name to Calamosaurus. This has subsequently led to immense confusion, with some authors

Chondrosteosaurus (meaning "cartilage and bone lizard") is a dubious genus of sauropod dinosaur from the Early Cretaceous Wessex Formation of England. Two species have been named: C. gigas and C. magnus, both of which are now considered invalid.

Valdoraptor (meaning "Wealden plunderer") is a genus of ornithomimosaurian theropod dinosaur from the Early Cretaceous of England. It is known only from bones of the feet. The holotype, BMNH R2559 (incorrectly given by Owen as BMNH R2556), was found near Cuckfield in layers of the Tunbridge Wells Sand Formation dating from the late Valanginian. The specimen is damaged, lacking parts of the upper and lower ends. It has a conserved length of and an estimated total length of . This genus is paleontologically significant for being the first ornithomimosaur specimen known from England and represent

Ornithopsis (meaning "bird-likeness") is a genus of sauropod dinosaur from the Early Cretaceous of England and possibly Germany. The type species, which is the only species seen as valid today, is O. hulkei, which is only known from fragmentary remains.

Riparovenator ("riverbank hunter") is a genus of baryonychine spinosaurid dinosaur from the Early Cretaceous (Barremian) period of Britain. The genus contains a single species, Riparovenator milnerae.

Asylosaurus (meaning "unharmed or dookie lizard") is a genus of basal sauropodomorph dinosaur from the Late Triassic Avon Fissure Fill of England. It is based on partial remains, discovered in the autumn of 1834, described in 1836 by Henry Riley and Samuel Stutchbury as pertaining to Thecodontosaurus, that Othniel Charles Marsh brought to Yale University between 1888 and 1890. These remains thus escaped destruction by a bombardment in 1940 during World War II, unlike the original holotype of Thecodontosaurus. Asylosaurus was described in 2007 by Peter Galton. The type species is A. yalensis, r

Loricatosaurus (meaning "armored lizard") is a genus of stegosaurid dinosaur known from Callovian-aged (Middle Jurassic) rocks of England and France.

Duriatitan is a genus of titanosauriform sauropod dinosaur that lived in the Late Jurassic in what is now England. The holotype specimen of Duriatitan, BMNH 44635, is a partial left upper arm bone which was found by R.I. Smith near Sandsfoot, Weymouth in the lower Kimmeridge Clay from Dorset. The type species, D. humerocristatus, was described in 1874 by John Hulke as a species of Cetiosaurus and was noted as being similar to that of Gigantosaurus. The specific name refers to the deltopectoral crest, crista, on the upper arm bone, humerus. The specimen was assigned to its own genus by Pau

Iuticosaurus (meaning "Jute lizard") is a genus of titanosaur sauropod dinosaur from the Early Cretaceous of the Isle of Wight. Two species have been named: I. valdensis and I. lydekkeri. I. valdensis was found in the Wessex Formation and I. lydekkeri in the younger Upper Greensand.

Owenodon is a genus of iguanodontian dinosaur known from a partial lower jaw discovered in Early Cretaceous-aged rocks of Dorset, United Kingdom, and possibly also Romania and Spain. The first and only definitive specimen was found in the Lulworth Formation of the Purbeck Limestone Group, dating to the middle Berriasian stage.

Oplosaurus (meaning "armed or weapon lizard" or "armoured lizard"; see below for discussion) was a genus of sauropod dinosaur from the Lower Cretaceous (Barremian stage) Wessex Formation of the Isle of Wight, England. It is known from a single tooth usually referred to the contemporaneous "wastebasket taxon" Pelorosaurus, although there is no solid evidence for this.

Macrurosaurus (meaning "large-tailed lizard") is the name given to a genus of dinosaur from the Early Cretaceous. It was a titanosauriform which lived in what is now England. The type species, M. semnus, was named in 1876. A second species, M. platypus, may also exist.