Remains of this small, poorly known perhaps saurolophine dinosaur were first discovered during the 1940s, from extensive erosional outcrops of the lower unnamed member of the Mooreville Chalk Formation (Selma Group; lower and middle Campanian) in Dallas County, west of the town of Selma, Alabama. The taxon has since also been reported from Black Creek Formation (Campanian) of North Carolina. The holotype, which is housed in the collections of the Field Museum in Chicago, consists of a fragmentary and disarticulated skull and incomplete postcranial skeleton. The length on the holotype specimen has been estimated as 4.5 metres (14 ft 9 in). The genus was named by Wann Langston in 1960. It was thought to be the only species of hadrosaur from that fossil formation, until 2016 with the discovery of the primitive hadrosaur, Eotrachodon orientalis. The name Lophorhothon means "crested nose" (Greeklophos meaning 'crested' and rhothon meaning 'nose'). The type species is Lophorhothon atopus. The specific name is derived from Greek atopos, "uncommon" or "strange".
The specimen which Langston designated as the holotype was discovered by Rainier Zangerl, Bill Turnbull and Charles Barber on a Field Museum expedition in 1946 and was given catalogue number FMNH P 27383. It consists of less than one half of the skull, a number of vertebrae, and significant portions of the fore- and hindlimbs. Preserved cranial material includes a partial quadrate, left maxilla, teeth, jugal, lacrimal, nasal (with the namesake crest), postorbital, frontal, prefrontal, parietal, squamosal, and paroccipital process and a portion of the predentary bone. The specimen was likely washed out to sea by a river, where it eventually sank and was buried in the silty carbonate sediments of the Mississippi embayment.
In 2021, a more complete specimen was unearthed in Alabama.[1]
Classification
Since the publication of Langston's description of Lophorhothon a number of workers have questioned the validity of this genus. It has been suggested, for example, that the material may actually represent a juvenile Prosaurolophus. James Lamb in 1998 has suggested the genus may actually represent a basal iguanodont, an idea that has failed to find widespread acceptance. More recent workers (Horner, Weishampel, and Forster, 2004) have classified Lophorhothon as a basal hadrosaurine and a sister taxon to all other hadrosaurines. An analysis published in 2010 indicated it was a basal member of the Hadrosauroidea.[2]
In 2021, new material from Alabama was unearthed not too far from where the original holotype was unearthed. This find cemented its status as a valid genus of hadrosauromorph.[3]
^Gates, Terry; Lamb, James (January 11, 2021). "Redescription of Lophorhothon atopus (Ornithopoda: Dinosauria) from the Late Cretaceous of Alabama based on new material". Canadian Journal of Earth Sciences. 58 (9): 918–935. Bibcode:2021CaJES..58..918G. doi:10.1139/cjes-2020-0173. S2CID 234293555. Retrieved January 13, 2021.
^A. Prieto-Marquez and G. C. Salinas, 2010, "A re-evaluation of Secernosaurus koerneri and Kritosaurus australis (Dinosauria, Hadrosauridae) from the Late Cretaceous of Argentina", Journal of Vertebrate Paleontology30(3): 813–837
^Gates, Terry; Lamb, James (January 11, 2021). "Redescription of Lophorhothon atopus (Ornithopoda: Dinosauria) from the Late Cretaceous of Alabama based on new material". Canadian Journal of Earth Sciences. 58 (9): 918–935. Bibcode:2021CaJES..58..918G. doi:10.1139/cjes-2020-0173. S2CID 234293555. Retrieved January 13, 2021.
Sources
Horner, J. R., Weishampel, D. B., and Forster, C. A. 2004. Chapter Twenty: Hadrosauridae. in The Dinosauria (2nd edition), Weishampel, D. B., Dodson, P., and Osmólska, H., editors. University of California Press.
Lamb, J. P. 1998. Lophorothon, an iguanodontian, not a hadrosaur. Journal of Vertebrate Paleontology, 18 (3 Abstracts): 59A.
Langston, W. 1960. The vertebrate fauna of the Selma Formation of Alabama, part VI: the dinosaurs. Fieldiana: Geology Memoirs 3(5): 315–359.
Schwimmer, D. R. 1997. Late Cretaceous dinosaurs in eastern USA: a taphonomic and biogeographic model of occurrences, p. 203–211. In D. L. Wolberg, E. Stump, and G. D. Rosenberg (eds.), Dinofest International. The Academy of Natural Sciences, Philadelphia.
Thurmond, J. T. and Jones, D. E. 1981. Fossil vertebrates of Alabama. University of Alabama Press.
January 29, 2023
lophorhothon, genus, hadrosauroid, dinosaur, from, late, cretaceous, first, genus, dinosaur, discovered, alabama, united, states, temporal, range, late, cretaceous, preꞒ, skeletal, elementsscientific, classificationkingdom, animaliaphylum, chordataclade, dinos. Lophorhothon is a genus of hadrosauroid dinosaur from the Late Cretaceous the first genus of dinosaur discovered in Alabama in the United States LophorhothonTemporal range Late Cretaceous 80 Ma PreꞒ Ꞓ O S D C P T J K Pg N Skeletal elementsScientific classificationKingdom AnimaliaPhylum ChordataClade DinosauriaOrder OrnithischiaClade OrnithopodaClade HadrosauromorphaGenus LophorhothonLangston 1960Type species Lophorhothon atopusLangston 1960 Contents 1 Discovery and naming 2 Classification 3 See also 4 References 5 SourcesDiscovery and naming Edit Reconstruction of the skull Remains of this small poorly known perhaps saurolophine dinosaur were first discovered during the 1940s from extensive erosional outcrops of the lower unnamed member of the Mooreville Chalk Formation Selma Group lower and middle Campanian in Dallas County west of the town of Selma Alabama The taxon has since also been reported from Black Creek Formation Campanian of North Carolina The holotype which is housed in the collections of the Field Museum in Chicago consists of a fragmentary and disarticulated skull and incomplete postcranial skeleton The length on the holotype specimen has been estimated as 4 5 metres 14 ft 9 in The genus was named by Wann Langston in 1960 It was thought to be the only species of hadrosaur from that fossil formation until 2016 with the discovery of the primitive hadrosaur Eotrachodon orientalis The name Lophorhothon means crested nose Greek lophos meaning crested and rhothon meaning nose The type species is Lophorhothon atopus The specific name is derived from Greek atopos uncommon or strange The specimen which Langston designated as the holotype was discovered by Rainier Zangerl Bill Turnbull and Charles Barber on a Field Museum expedition in 1946 and was given catalogue number FMNH P 27383 It consists of less than one half of the skull a number of vertebrae and significant portions of the fore and hindlimbs Preserved cranial material includes a partial quadrate left maxilla teeth jugal lacrimal nasal with the namesake crest postorbital frontal prefrontal parietal squamosal and paroccipital process and a portion of the predentary bone The specimen was likely washed out to sea by a river where it eventually sank and was buried in the silty carbonate sediments of the Mississippi embayment In 2021 a more complete specimen was unearthed in Alabama 1 Classification EditSince the publication of Langston s description of Lophorhothon a number of workers have questioned the validity of this genus It has been suggested for example that the material may actually represent a juvenile Prosaurolophus James Lamb in 1998 has suggested the genus may actually represent a basal iguanodont an idea that has failed to find widespread acceptance More recent workers Horner Weishampel and Forster 2004 have classified Lophorhothon as a basal hadrosaurine and a sister taxon to all other hadrosaurines An analysis published in 2010 indicated it was a basal member of the Hadrosauroidea 2 In 2021 new material from Alabama was unearthed not too far from where the original holotype was unearthed This find cemented its status as a valid genus of hadrosauromorph 3 See also Edit Dinosaurs portalTimeline of hadrosaur researchReferences Edit Gates Terry Lamb James January 11 2021 Redescription of Lophorhothon atopus Ornithopoda Dinosauria from the Late Cretaceous of Alabama based on new material Canadian Journal of Earth Sciences 58 9 918 935 Bibcode 2021CaJES 58 918G doi 10 1139 cjes 2020 0173 S2CID 234293555 Retrieved January 13 2021 A Prieto Marquez and G C Salinas 2010 A re evaluation of Secernosaurus koerneri and Kritosaurus australis Dinosauria Hadrosauridae from the Late Cretaceous of Argentina Journal of Vertebrate Paleontology 30 3 813 837 Gates Terry Lamb James January 11 2021 Redescription of Lophorhothon atopus Ornithopoda Dinosauria from the Late Cretaceous of Alabama based on new material Canadian Journal of Earth Sciences 58 9 918 935 Bibcode 2021CaJES 58 918G doi 10 1139 cjes 2020 0173 S2CID 234293555 Retrieved January 13 2021 Sources EditHorner J R Weishampel D B and Forster C A 2004 Chapter Twenty Hadrosauridae in The Dinosauria 2nd edition Weishampel D B Dodson P and Osmolska H editors University of California Press Lamb J P 1998 Lophorothon an iguanodontian not a hadrosaur Journal of Vertebrate Paleontology 18 3 Abstracts 59A Langston W 1960 The vertebrate fauna of the Selma Formation of Alabama part VI the dinosaurs Fieldiana Geology Memoirs 3 5 315 359 Schwimmer D R 1997 Late Cretaceous dinosaurs in eastern USA a taphonomic and biogeographic model of occurrences p 203 211 In D L Wolberg E Stump and G D Rosenberg eds Dinofest International The Academy of Natural Sciences Philadelphia Thurmond J T and Jones D E 1981 Fossil vertebrates of Alabama University of Alabama Press Retrieved from https en wikipedia org w index php title Lophorhothon amp oldid 1114964823, wikipedia, wiki, book, books, library,
