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| Genus: | Hulettia Patterson, 1984 |
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| Hulettia americana Eastman, 1899 | |
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Hulettia is an extinct genus of ray-finned fish known from United States. This fish genus contains two species, H. americana and H. hawesi.
The type species, H. americana is originally described as a species of Pholidophorus in 1899. [1] In 1984, its own genus name Hulettia is given, after Hulett, Wyoming. Holotype is known from Sundance Formation of South Dakota, while other specimens are also known from Wanakah (Summerville) Formation, Todilto Formation and Ralston Creek Formation. [2] [3]
Second species, H. hawesi is described from Morrison Formation. This species is named after William Hawes who found the holotype. [4]
H. americana reached their maximum standard length (excluding fins) of 15.5 centimetres (6.1 in), while H. hawesi is much smaller, with standard length of 5.85 centimetres (2.30 in) (about 7.2 centimetres (2.8 in) total length). [2] [4]
At 1984, it was classified as Halecostomi incertae sedis. [2] Later study shows that is likely a member of Neopterygii, pan-holostean. [5]
Formations that H. americana known are considered as marine environment, [3] while Morrison Formation where H. hawesi described shows freshwater environment. [4] Discovered specimens show evidence of predation upon the smaller species of fish Todiltia . [6]
Camarasaurus was a genus of quadrupedal, herbivorous dinosaurs and is the most common North American sauropod fossil. Its fossil remains have been found in the Morrison Formation, dating to the Late Jurassic epoch, between 155 and 145 million years ago.
Ceratosaurus was a carnivorous theropod dinosaur that lived in the Late Jurassic period. The genus was first described in 1884 by American paleontologist Othniel Charles Marsh based on a nearly complete skeleton discovered in Garden Park, Colorado, in rocks belonging to the Morrison Formation. The type species is Ceratosaurus nasicornis.
Barosaurus was a giant, long-tailed, long-necked, plant-eating sauropod dinosaur closely related to the more familiar Diplodocus. Remains have been found in the Morrison Formation from the Upper Jurassic Period of Utah and South Dakota. It is present in stratigraphic zones 2–5.
Dryosaurus is a genus of an ornithopod dinosaur that lived in the Late Jurassic period. It was an iguanodont. Fossils have been found in the western United States and were first discovered in the late 19th century. Valdosaurus canaliculatus and Dysalotosaurus lettowvorbecki were both formerly considered to represent species of Dryosaurus.
Leedsichthys is an extinct genus of pachycormid fish that lived in the oceans of the Middle to Late Jurassic. It is the largest ray-finned fish, and amongst the largest fish known to have ever existed.
Saurophaganax is a genus of large allosaurid dinosaur from the Morrison Formation of Late Jurassic Oklahoma, United States. Some paleontologists consider it to be a junior synonym and species of Allosaurus. Saurophaganax represents a very large Morrison allosaurid characterized by horizontal laminae at the bases of the dorsal neural spines above the transverse processes, and "meat-chopper" chevrons. It was the largest terrestrial carnivore of North America during the Late Jurassic, reaching 10.5 metres (34 ft) in length and 2.7–3.8 metric tons in body mass.
Gastonia is a genus of herbivorous ankylosaurian dinosaur from the Early Cretaceous of North America, around 139 to 134.6 million years ago. It is often considered a nodosaurid closely related to Polacanthus. Gastonia has a sacral shield and large shoulder spikes.
Stokesosaurus is a genus of small, carnivorous early tyrannosauroid theropod dinosaurs from the late Jurassic period of Utah, United States and Guimarota, Portugal.
Dystrophaeus is an extinct genus of sauropod dinosaur. Its type and only species is Dystrophaeus viaemalae, named by Edward Drinker Cope in 1877. Its fossils were found in the Tidwell Member of the Morrison Formation of Utah. Due to the fragmentary condition of its only known specimen, the affinities of Dystrophaeus are uncertain, although excavations carried out at the discovery site since 1989 have uncovered more of the original specimen and hold the potential for an improved understanding of the taxon.
Marshosaurus is a genus of medium-sized carnivorous theropod dinosaur, belonging to the family Piatnitzkysauridae, from the Late Jurassic Morrison Formation of Utah and possibly Colorado.
Lepidotes is an extinct genus of Mesozoic ray-finned fish. It has long been considered a wastebasket taxon, characterised by "general features, such as thick rhomboid scales and, for most of the species, by semi-tritorial or strongly tritorial dentition". with dozens of species assigned to it. Fossils attributed to Lepidotes have been found in Jurassic and Cretaceous rocks worldwide. It has been argued that Lepidotes should be restricted to species closely related to the type species L. gigas, which are only known from the Early Jurassic of Western and Central Europe, with most other species being not closely related, with other species transferred to new genera such as Scheenstia.Lepidotes belongs to Ginglymodi, a clade of fish whose only living representatives are the gars (Lepisosteidae). The type species L. gigas and close relatives are thought to be members of the family Lepidotidae, part of the order Lepisosteiformes within Ginglymodi, with other species occupying various other positions within Ginglymodi.
Leptolepis is an extinct genus of stem-teleost fish that lived in what is now Europe during the Jurassic period.
Amphicoelias is a genus of herbivorous sauropod dinosaur that lived approximately 150 million years ago during the Tithonian of what is now Colorado, United States. Amphicoelias was moderately sized at about 18 metres (59 ft) in length and 15 metric tons in body mass, shorter than its close relative Diplodocus. Its hindlimbs were very long and thin, and its forelimbs were proportionally longer than in relatives.
Eutretauranosuchus is an extinct genus of goniopholidid crocodyliform. E. delfsi is the only known species within the genus.
Asarotus is an extinct genus of prehistoric marine ray-finned fish from the Niobrara Formation of Nebraska, during the Campanian. The type species, A. arcanus is only known from poorly preserved single specimen, which makes hard to classify existing orders of Cretaceous actinopterygians. It is thus classified as the only member of its family Asarotidae and order Asarotiformes. Some authorities consider it a late-surviving member of the "palaeonisciform" fishes.
Moenkopia is an extinct genus of prehistoric sarcopterygians from the Coelacanthidae found in the Middle Triassic Moenkopi Formation of Arizona. The type, and only species, M. wellesi, was named in 1961 in honour of Samuel Paul Welles. It is only known from the holotype, UMCP 36193, a partial skull consisting only of the basisphenoid that was collected in 1939 or 1940 by Samuel Welles and briefly noted on by him in 1947, and other assorted specimens found before 2005 in the Radar Mesa by S. J. Nesbitt, W. G. Parker and R. B. Irmis.
Cosmolepis is an extinct genus of prehistoric marine ray-finned fish that lived during the Early Jurassic epoch. It contains a single species, C. ornatus from the Blue Lias in what is now England. It is the only member of the family Cosmolepididae.
Occithrissops is an extinct genus of prehistoric ray-finned fish of the Jurassic, described from Sundance Formation. The genus name of Occithrissops refers to the occidental occurrence of the genus and its relationship to Thrissops.
Morrolepis is an extinct genus of prehistoric coccolepidid "palaeoniscoid" ray-finned fish that lived during the Late Jurassic and earliest Cretaceous epochs in Europe, Asia and North America.
Uteodon is a genus of herbivorous iguanodontian dinosaur. It is a basal iguanodontian which lived during the late Jurassic period in what is now Uintah County, Utah. It is known from the middle of the Brushy Basin Member, Morrison Formation. The genus was named by Andrew T. McDonald in 2011 and the type species is U. aphanoecetes.
