Early Cretaceous Multituberculate Mammals from the Kuwajima Formation (Tetori Group), Central Japan

Kusuhashi, Nao

doi:10.4202/app.2008.0302

Cited by 36 publications

(43 citation statements)

References 17 publications

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“…Kusuhashi, 2008;Tsubamoto, 2004), which overlies the choristodere bearing Kuwajima and Okurodani formations in Japan (e.g. Fujita, 2003;Kusuhashi, 2008).…”

Section: Assemblage Compositionmentioning

confidence: 99%

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Choristoderes and the freshwater assemblages of Laurasia

Matsumoto¹,

Evans²

2010

J. iber. geol.

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Choristoderes are freshwater aquatic diapsid reptiles of uncertain phylogenetic position. Although the lineage probably diverged from other diapsids in the Permo-Triassic, choristoderes apparently never reached Gondwana. Within Laurasia, however, they have been recovered from Japan, China, Mongolia, Trans-Baikal Russia, Central Asia, Western Europe, and North America, reaching extreme northern latitudes. Setting aside controversial Triassic records, their known temporal range currently extends from the Middle Jurassic (Britain, Kyrgyzstan) to the Miocene (Czech Republic). However, although small choristoderes are known to span the entirety of this period, the larger, more derived neochoristoderes are recorded only from the Early Cretaceous through to the earliest Eocene. The gavial-like neochoristodere Champsosaurus is the most familiar taxon, characterised by large size, a long rostrum and flared temporal fenestrae, but research over the last three decades has revealed many new genera and exposed an unexpected diversity in terms of body size (small to relatively large), neck length (long v. short) and skull morphology (longirostrine v. brevirostrine, open v. closed lower temporal fenestrae). Typically choristoderes occur as part of a mesic assemblage that includes fish, lizards, mammals, turtles, frogs, salamanders, small dinosaurs and, usually, crocodiles. At maturity, Jurassic choristoderes were generally smaller than co-occuring crocodiles and were relatively unspecialized postcranially. The Early Cretaceous of Asia saw a dramatic diversification of choristoderes, including the appearance of much larger neochoristoderes. Perhaps significantly, the relevant Asian horizons (e.g. Yixian Formation, China; Okurodani and Kuwajima formations, Japan) yield no crocodiles. In Late Cretaceous and Paleogene horizons however, across Euramerica, large gavial-like neochoristoderes came to share freshwater ecosystems with a diversity of crocodiles, the neochoristoderes apparently occupying a specialist (gavial-like) piscivorous niche as long as it was available and resources were adequate.

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“…Kusuhashi, 2008;Tsubamoto, 2004), which overlies the choristodere bearing Kuwajima and Okurodani formations in Japan (e.g. Fujita, 2003;Kusuhashi, 2008).…”

Section: Assemblage Compositionmentioning

confidence: 99%

“…Kusuhashi, 2008;Tsubamoto, 2004), which overlies the choristodere bearing Kuwajima and Okurodani formations in Japan (e.g. Fujita, 2003;Kusuhashi, 2008). To date, only one Asian horizon (the Barremian Laohongdong Formation, Inner Mongolia) is known to contain both choristoderes (Tchoiria) and crocodiles.…”

Section: Assemblage Compositionmentioning

confidence: 99%

Choristoderes and the freshwater assemblages of Laurasia

Matsumoto¹,

Evans²

2010

J. iber. geol.

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“…by the presence of some shared, or closely related, taxa, notably of fish (Yabumoto, 2000(Yabumoto, , 2014, choristoderan reptiles (Evans and Manabe, 1999a;Matsumoto et al, 2007Matsumoto et al, , 2014, and multituberculate mammals (Kusuhashi, 2008). As yet, only two of the Japanese lizard genera are known to be closely related to Chinese taxa.…”

Section: Discussionmentioning

confidence: 99%

An assemblage of lizards from the Early Cretaceous of Japan

Evans

Matsumoto

2015

Palaeontologia Electronica

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“…At the same time recently new fossil assemblages were also recovered from the Tetori Group, i.e. the Jurassic plants (Yamada and Uemura, 2008) and radiolarians (Kashiwagi and Hirasawa, 2010), the Early Cretaceous charophytes (Komatsu et al, 2003;Kubota, 2005), palynomorphs (Umetsu and Matsuoka, 2003;Legrand et al, 2013), gastrapods (Isaji, 2010), turtles (Hirayama, 2002), dinosaurs (Kobayashi and Azuma, 2003;Azuma and Shibata, 2010), pterosaurs (Unwin et al, 1996) and mammals (Tsubamoto et al, 2004;Rougier et al, 2007;Kusuhashi, 2008). In consideration the new data of biostratigraphy and radiometric dating of the Tetori Group (Fujita, 2002;Kusuhashi et al, 2006;Kawagoe et al, 2012), new interpretation has been proposed on the correlation scheme of late Mesozoic sequences between China and Japan (Sha and Hirano, 2012).…”

Section: Potential Non-marine J/k Boundary In Northern Chinamentioning

confidence: 99%