Huehuecanauhtlus was first described and named by Angel Alejandro Ramírez-Velasco, Mouloud Benammi, Albert Prieto-Márquez, Jesús Alvarado Ortega and René Hernández-Rivera in 2012 and the type species is Huehuecanauhtlus tiquichensis. The generic name is derived from Náhuatl (group of dialects related to the Aztecan languages) huehuetl, meaning "ancient" and canauhtli, meaning "duck" in reference to its hadrosauroid affinities. The specific name, tiquichensis, honors the town of Tiquicheo, for the generosity and hospitality of its people during the fieldwork season.[1]
DiscoveryEdit
Huehuecanauhtlus is known only from two individuals. The holotype IGM 6253 represented by fragmentary skull (partial left maxilla and dentary fragment) and postcranialskeleton including four cervical vertebrae, nine dorsal vertebrae, four dorsal neural spines, one dorsal diapophysis, five right dorsal ribs, seven left dorsal ribs, seven sacral neural spines, seven sacral diapophyses, one caudal diapophysis, three caudal vertebrae, two caudal neural spine, eight fragmentary ossified tendons, left and right partial ilium, and left and right partial pubis. The smaller paratype, IGM 6254, is represented by fragment of left dentary, two teeth, and one cervical prezygapophysis.[1]
Both specimens were collected at the Barranca Los Bonetes locality in Tuzantla, Michoacán. The holotype came from the sixth fossiliferous spot, whereas the paratype came from the third spot, of an unnamed formation, dating to the Santonian stage of the Late Cretaceousperiod, about 85.8–83.5 million years ago.[1]
DescriptionEdit
Ramírez-Velasco et al. (2012) diagnosed Huehuecanauhtlus by a unique combination of characters. For example, two teeth exposed on the occlusal plane of the rostral third and the posterior third of the dentary and maxilla, respectively. It had seven sacral vertebrae and tall neural spines of posterior vertebrae, being between 3.5 and 4 times taller than their corresponding centra. As in Claosaurus, its supraacetabular process is as long as 75% of the length of the central iliac plate, with an apex located above the posteroventral corner of the ischiac tuberosity. It differs from other hadrosauroids in possessing an extremely deflected preacetabular process of the ilium, so that the bisecting long axis of the process forms an angle less than 130° with the horizontal plane defined by the ischiac and pubic peduncles. It can be differentiated from basal hadrosauroids in having a very deep concave profile of the dorsomedial margin of the iliac plate, adjacent to the supraacetabular process.[1] A phylogenetic analysis performed by Ramírez-Velasco et al. (2012) found a big polytomy of all hadrosauroids which are more derived than Probactrosaurus but less derived than Hadrosauridae. The exclusion of Claosaurus, Jeyawati, Levnesovia, Nanyangosaurus, Shuangmiaosaurus and Telmatosaurus from the polytomy resulted in a more resolved topology. The cladogram below shows Huehuecanauhtlus phylogenetic position among other hadrosauroids following this topology (the relationships within Hadrosauridae are not shown).[1]
Wikimedia Commons has media related to Huehuecanauhtlus.
^ abcdefAngel Alejandro Ramírez-Velasco; Mouloud Benammi; Albert Prieto-Márquez; Jesús Alvarado Ortega; René Hernández-Rivera (2012). "Huehuecanauhtlus tiquichensis, a new hadrosauroid dinosaur (Ornithischia: Ornithopoda) from the Santonian (Late Cretaceous) of Michoacán, Mexico". Canadian Journal of Earth Sciences. 49 (2): 379–395. Bibcode:2012CaJES..49..379R. doi:10.1139/e11-062.
huehuecanauhtlus, genus, hadrosauroid, dinosaur, known, from, late, cretaceous, santonian, stage, michoacán, western, mexico, contains, single, species, tiquichensis, temporal, range, santonian, preꞒ, scientific, classificationdomain, eukaryotakingdom, animali. Huehuecanauhtlus is a genus of hadrosauroid dinosaur known from the Late Cretaceous Santonian stage of Michoacan western Mexico It contains a single species Huehuecanauhtlus tiquichensis 1 HuehuecanauhtlusTemporal range Santonian 85 8 83 5 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClade DinosauriaClade OrnithischiaClade OrnithopodaClade HadrosauromorphaGenus HuehuecanauhtlusRamirez Velasco et al 2012Type species Huehuecanauhtlus tiquichensisRamirez Velasco et al 2012 Contents 1 Etymology 2 Discovery 3 Description 4 See also 5 ReferencesEtymology EditHuehuecanauhtlus was first described and named by Angel Alejandro Ramirez Velasco Mouloud Benammi Albert Prieto Marquez Jesus Alvarado Ortega and Rene Hernandez Rivera in 2012 and the type species is Huehuecanauhtlus tiquichensis The generic name is derived from Nahuatl group of dialects related to the Aztecan languages huehuetl meaning ancient and canauhtli meaning duck in reference to its hadrosauroid affinities The specific name tiquichensis honors the town of Tiquicheo for the generosity and hospitality of its people during the fieldwork season 1 Discovery EditHuehuecanauhtlus is known only from two individuals The holotype IGM 6253 represented by fragmentary skull partial left maxilla and dentary fragment and postcranial skeleton including four cervical vertebrae nine dorsal vertebrae four dorsal neural spines one dorsal diapophysis five right dorsal ribs seven left dorsal ribs seven sacral neural spines seven sacral diapophyses one caudal diapophysis three caudal vertebrae two caudal neural spine eight fragmentary ossified tendons left and right partial ilium and left and right partial pubis The smaller paratype IGM 6254 is represented by fragment of left dentary two teeth and one cervical prezygapophysis 1 Both specimens were collected at the Barranca Los Bonetes locality in Tuzantla Michoacan The holotype came from the sixth fossiliferous spot whereas the paratype came from the third spot of an unnamed formation dating to the Santonian stage of the Late Cretaceous period about 85 8 83 5 million years ago 1 Description EditRamirez Velasco et al 2012 diagnosed Huehuecanauhtlus by a unique combination of characters For example two teeth exposed on the occlusal plane of the rostral third and the posterior third of the dentary and maxilla respectively It had seven sacral vertebrae and tall neural spines of posterior vertebrae being between 3 5 and 4 times taller than their corresponding centra As in Claosaurus its supraacetabular process is as long as 75 of the length of the central iliac plate with an apex located above the posteroventral corner of the ischiac tuberosity It differs from other hadrosauroids in possessing an extremely deflected preacetabular process of the ilium so that the bisecting long axis of the process forms an angle less than 130 with the horizontal plane defined by the ischiac and pubic peduncles It can be differentiated from basal hadrosauroids in having a very deep concave profile of the dorsomedial margin of the iliac plate adjacent to the supraacetabular process 1 A phylogenetic analysis performed by Ramirez Velasco et al 2012 found a big polytomy of all hadrosauroids which are more derived than Probactrosaurus but less derived than Hadrosauridae The exclusion of Claosaurus Jeyawati Levnesovia Nanyangosaurus Shuangmiaosaurus and Telmatosaurus from the polytomy resulted in a more resolved topology The cladogram below shows Huehuecanauhtlus phylogenetic position among other hadrosauroids following this topology the relationships within Hadrosauridae are not shown 1 Hadrosauroidea Jinzhousaurus yangiFukuisaurus tetoriensisPenelopognathus weishampeliEquijubus normaniProbactrosaurus gobiensisEolambia caroljonesaProtohadros byrdiTanius sinensisBactrosaurus johnsoniGlishades ericksoniGilmoreosaurus mongoliensisHuehuecanauhtlus tiquichensisJintasaurus meniscusTethyshadros insularisHadrosauridaeSee also EditTimeline of hadrosaur researchReferences Edit nbsp Wikimedia Commons has media related to Huehuecanauhtlus a b c d e f Angel Alejandro Ramirez Velasco Mouloud Benammi Albert Prieto Marquez Jesus Alvarado Ortega Rene Hernandez Rivera 2012 Huehuecanauhtlus tiquichensis a new hadrosauroid dinosaur Ornithischia Ornithopoda from the Santonian Late Cretaceous of Michoacan Mexico Canadian Journal of Earth Sciences 49 2 379 395 Bibcode 2012CaJES 49 379R doi 10 1139 e11 062 Portals nbsp Cretaceous nbsp Dinosaurs nbsp Mexico nbsp Paleontology Retrieved from https en wikipedia org w index php title Huehuecanauhtlus amp oldid 1179549970, wikipedia, wiki, book, books, library,
