The holotype of Llukalkan, MAU-Pv-LI-581, consisting of a partial skull, was discovered during 2015 in the La Invernada site in Neuquén Province, Argentina, in the rocks of the Bajo de la Carpa Formation. It was discovered only 700 metres (2,300 ft) away from the remains of the contemporary abelisaurid Viavenator. It was described as belonging to the new taxon Llukalkan aliocranianus in 2021; the generic name is Mapuche for "one who scares" or "one who causes fear", and the specific name is Latin for "different skull".
Descriptionedit
Llukalkan is very similar to Viavenator, except that it is smaller and the holes in the skull through which the veins pass are larger and more widely separated from the supraoccipital crest, among other differences. It also has a small posterior air-filled sinus in the middle ear zone, a recessus tympanicus caudalis, that has not been found in any other abelisaurids and thus is an autapomorphy.[2]
Paleobiologyedit
On account of its unusual ear, it has been theorized than Llukalkan had a keener sense of hearing than other abelisaurids, almost like a crocodile's.[2]
Classificationedit
Gianechini et al. place Llukalkan as a derived abelisaurid, in the clade Furileusauria. Their cladogram is shown below.[1]
^ abGianechini, Federico A.; Méndez, Ariel H.; Filippi, Leonardo S.; Paulina-Carabajal, Ariana; Juárez-Valieri, Rubén D.; Garrido, Alberto C. (2021). "A New Furileusaurian Abelisaurid from La Invernada (Upper Cretaceous, Santonian, Bajo De La Carpa Formation), Northern Patagonia, Argentina". Journal of Vertebrate Paleontology: e1877151. doi:10.1080/02724634.2020.1877151.
^ abTaylor & Francis Group (30 March 2021). "The 'one who causes fear' - new meat-eating predator discovered". ScienceDaily. Retrieved 31 March 2021.
March 22, 2024
llukalkan, mapuche, causes, fear, genus, abelisaurid, theropod, dinosaur, from, late, cretaceous, bajo, carpa, formation, argentina, type, species, aliocranianus, temporal, range, santonian, preꞒ, scientific, classificationdomain, eukaryotakingdom, animaliaphy. Llukalkan Mapuche for one who causes fear is a genus of abelisaurid theropod dinosaur from the Late Cretaceous Bajo de la Carpa Formation of Argentina The type species is Llukalkan aliocranianus 1 LlukalkanTemporal range Santonian 86 83 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClade DinosauriaClade SaurischiaClade TheropodaFamily AbelisauridaeClade FurileusauriaGenus LlukalkanGianechini et al 2021Type species Llukalkan aliocranianusGianechini et al 2021 Contents 1 Discovery and naming 2 Description 3 Paleobiology 4 Classification 5 ReferencesDiscovery and naming editThe holotype of Llukalkan MAU Pv LI 581 consisting of a partial skull was discovered during 2015 in the La Invernada site in Neuquen Province Argentina in the rocks of the Bajo de la Carpa Formation It was discovered only 700 metres 2 300 ft away from the remains of the contemporary abelisaurid Viavenator It was described as belonging to the new taxon Llukalkan aliocranianus in 2021 the generic name is Mapuche for one who scares or one who causes fear and the specific name is Latin for different skull Description editLlukalkan is very similar to Viavenator except that it is smaller and the holes in the skull through which the veins pass are larger and more widely separated from the supraoccipital crest among other differences It also has a small posterior air filled sinus in the middle ear zone a recessus tympanicus caudalis that has not been found in any other abelisaurids and thus is an autapomorphy 2 Paleobiology editOn account of its unusual ear it has been theorized than Llukalkan had a keener sense of hearing than other abelisaurids almost like a crocodile s 2 Classification editGianechini et al place Llukalkan as a derived abelisaurid in the clade Furileusauria Their cladogram is shown below 1 Abelisauridae KryptopsRugopsMajungasaurinaeBrachyrostra XenotarsosaurusDahalokelyRahiolisaurusIlokelesiaEkrixinatosaurusSkorpiovenatorFurileusauria PycnonemosaurusQuilmesaurusViavenatorLlukalkanCarnotaurusAbelisaurinae AucasaurusAbelisaurusReferences edit a b Gianechini Federico A Mendez Ariel H Filippi Leonardo S Paulina Carabajal Ariana Juarez Valieri Ruben D Garrido Alberto C 2021 A New Furileusaurian Abelisaurid from La Invernada Upper Cretaceous Santonian Bajo De La Carpa Formation Northern Patagonia Argentina Journal of Vertebrate Paleontology e1877151 doi 10 1080 02724634 2020 1877151 a b Taylor amp Francis Group 30 March 2021 The one who causes fear new meat eating predator discovered ScienceDaily Retrieved 31 March 2021 Retrieved from https en wikipedia org w index php title Llukalkan amp oldid 1188116360, wikipedia, wiki, book, books, library,
