{"id":16791,"date":"2019-09-06T07:31:49","date_gmt":"2019-09-06T07:31:49","guid":{"rendered":"https:\/\/www.revoscience.com\/en\/?p=16791"},"modified":"2020-06-09T12:41:45","modified_gmt":"2020-06-09T12:41:45","slug":"new-duck-billed-dinosaur-kamuysaurus-japonicus-identified","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/new-duck-billed-dinosaur-kamuysaurus-japonicus-identified\/","title":{"rendered":"New duck-billed dinosaur, Kamuysaurus japonicus, identified"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

The study also shed light on the origin of the<\/strong><\/em>\u00a0Edmontosaurini clade<\/strong><\/em><\/a>\u00a0and how it might have migrated. <\/strong><\/em><\/p>\n\n\n\n

The dinosaur, whose nearly complete skeleton was unearthed from 72 million year old marine deposits in Mukawa Town in northern Japan, belongs to a new genus and species of a herbivorous hadrosaurid dinosaur, according to the study published in\u00a0Scientific Reports<\/a><\/em>. The scientists named the dinosaur\u00a0Kamuysaurus japonicus.<\/a><\/em><\/p>\n\n\n\n

A partial tail of the dinosaur\u00a0was first discovered\u00a0in\u00a0the outer shelf deposits of the Upper Cretaceous Hakobuchi Formation in the Hobetsu district of Mukawa Town, Hokkaido, in 2013. Ensuing excavations found a nearly complete skeleton that is the largest dinosaur skeleton ever found in Japan. It\u2019s been known as \u201cMukawaryu,\u201d nicknamed after the excavation site.<\/p>\n\n\n\n

In the current study, a group of researchers led by Professor Yoshitsugu Kobayashi of the Hokkaido University Museum conducted comparative and phylogenetic analyses on 350 bones and 70 taxa of hadrosaurids, which led to the discovery that the dinosaur belongs to the Edmontosaurini clade<\/a>, and is closely related to\u00a0Kerberosaurus<\/em>\u00a0unearthed in Russia and\u00a0Laiyangosaurus<\/em>\u00a0found in China.<\/p>\n\n\n\n

The research team also found that\u00a0Kamuysaurus japonicus,<\/em>\u00a0or the deity of Japanese dinosaurs,has three unique characteristics that are not shared by other dinosaurs in the Edmontosaurini clade: the low position of the cranial bone notch, the short ascending process of the jaw bone, and the anterior inclination of the neural spines of the sixth to twelfth dorsal vertebrae.<\/p>\n\n\n\n

According to the team\u2019s histological study, the dinosaur was an adult aged 9 or older, measured 8 meters long and weighed 4 tons or 5.3 tons (depending on whether it was walking on two or four legs respectively) when it was alive. The frontal bone, a part of its skull, has a big articular facet connecting to the nasal bone, suggesting the dinosaur may have had a crest. The crest, if it existed, is believed to resemble the thin, flat crest of\u00a0Brachylophosaurus<\/em>\u00a0subadults, whose fossils have been unearthed in North America.<\/p>\n\n\n\n

The study also shed light on the origin of the\u00a0Edmontosaurini clade<\/a>\u00a0and how it might have migrated. Its latest common ancestors\u00a0spread widely across Asia and North America, which were connected by what is now Alaska, allowing them to travel between the two continents. Among them, the clade of\u00a0Kamuysaurus<\/a>, Kerberosaurus<\/em>\u00a0and\u00a0Laiyangosaurus<\/a><\/em>\u00a0<\/a>inhabited the Far East during the Campanian, the fifth of six ages of the Late Cretaceous epoch, before evolving independently.<\/p>\n\n\n\n

The research team\u2019s analyses pointed to the possibility that ancestors of hadrosaurids and its subfamilies, Hadrosaurinae and Lambeosaurinae, preferred to inhabit areas near the ocean, suggesting the coastline environment was an important factor in the diversification of the hadrosaurids in its early evolution, especially in North America.<\/p>\n
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The dinosaur, whose nearly complete skeleton was unearthed from 72 million year old marine deposits in Mukawa Town in northern Japan, belongs to a new genus and species of a herbivorous hadrosaurid dinosaur, according to the study published in Scientific Reports. <\/p>\n","protected":false},"author":2,"featured_media":16792,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,17],"tags":[],"class_list":["post-16791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",1349,936,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-200x200.jpg",200,200,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-300x208.jpg",300,208,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-768x533.jpg",750,521,true],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-1024x710.jpg",750,520,true],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",1349,936,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",1349,936,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",1153,800,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",822,570,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",600,416,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",600,416,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-760x490.jpg",760,490,true],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-550x360.jpg",550,360,true],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors-95x65.jpg",95,65,true],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",640,444,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",96,67,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2019\/09\/dinosors.jpg",150,104,false]},"author_info":{"info":["RevoScience"]},"category_info":"News<\/a> Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/16791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=16791"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/16791\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/16792"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=16791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=16791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=16791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}