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A new titanosauriform sauropod (Dinosauria: Saurischia) from the Lower Cretaceous of Hyogo, Japan.
Zootaxa. 2014 Aug 12; 3848:1-66.Z

Abstract

A new genus and species of titanosauriform sauropod is erected based on a partial skeleton found in the Lower Cretaceous Sasayama Group of Hyogo Prefecture, SW Japan. The new taxon is here named as Tambatitanis amicitiae gen. et sp. nov., which is diagnosed by the following features of the caudal vertebrae, chevrons and braincase: the postzygapophysis and the summit of the neural spine of the anterior caudal vertebrae are located beyond the posterior border of the centrum, the spine of the anterior caudal vertebrae is curved strongly anteriorly and bow-shaped in lateral view, the summit of the neural spine is expanded and hemispherical with its anterior face excavated by the posterodorsal extension of a deep and narrow SPRF, the transverse process of the anterior caudal vertebrae are short and L shaped, the anterior chevron is the longest among sauropods in proportion to body size, the distal ends of the anterior chevrons are rod-shaped, the distal ends of the mid chevrons are transversely thin and anteroposteriorly long without cranial processes, and the dorsal border of the shaft of the paroccipital process that forms the ventral margin of the posttemporal fenestra is short mediolaterally and V-shaped in posterior view. A phylogenetic analysis suggests that T. amicitiae is a basal titanosauriform, possibly belonging to the East Asian endemic clade Euhelopodidae. The caudals and chevrons are described in detail in order to document highly autapomorphic features of the new taxon as well as potentially phylogenetically informative characters. The discovery of T. amicitiae suggests that East Asian basal titanosauriforms were diverse not only in the number of the taxa but also in the morphological variation of the caudal elements.

Authors+Show Affiliations

Institute of Natural and Environmental Sciences, University of Hyogo, Hyogo 669-1546, Japan; Email: saegusa@hitohaku.jp.Museum of Nature and Human Activities, Hyogo, Hyogo 669-1546, Japan; Email: unknown.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25112425

Citation

Saegusa, Haruo, and Tadahiro Ikeda. "A New Titanosauriform Sauropod (Dinosauria: Saurischia) From the Lower Cretaceous of Hyogo, Japan." Zootaxa, vol. 3848, 2014, pp. 1-66.
Saegusa H, Ikeda T. A new titanosauriform sauropod (Dinosauria: Saurischia) from the Lower Cretaceous of Hyogo, Japan. Zootaxa. 2014;3848:1-66.
Saegusa, H., & Ikeda, T. (2014). A new titanosauriform sauropod (Dinosauria: Saurischia) from the Lower Cretaceous of Hyogo, Japan. Zootaxa, 3848, 1-66. https://doi.org/10.11646/zootaxa.3848.1.1
Saegusa H, Ikeda T. A New Titanosauriform Sauropod (Dinosauria: Saurischia) From the Lower Cretaceous of Hyogo, Japan. Zootaxa. 2014 Aug 12;3848:1-66. PubMed PMID: 25112425.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A new titanosauriform sauropod (Dinosauria: Saurischia) from the Lower Cretaceous of Hyogo, Japan. AU - Saegusa,Haruo, AU - Ikeda,Tadahiro, Y1 - 2014/08/12/ PY - 2014/08/11/received PY - 2014/8/13/entrez PY - 2014/8/13/pubmed PY - 2016/5/10/medline SP - 1 EP - 66 JF - Zootaxa JO - Zootaxa VL - 3848 N2 - A new genus and species of titanosauriform sauropod is erected based on a partial skeleton found in the Lower Cretaceous Sasayama Group of Hyogo Prefecture, SW Japan. The new taxon is here named as Tambatitanis amicitiae gen. et sp. nov., which is diagnosed by the following features of the caudal vertebrae, chevrons and braincase: the postzygapophysis and the summit of the neural spine of the anterior caudal vertebrae are located beyond the posterior border of the centrum, the spine of the anterior caudal vertebrae is curved strongly anteriorly and bow-shaped in lateral view, the summit of the neural spine is expanded and hemispherical with its anterior face excavated by the posterodorsal extension of a deep and narrow SPRF, the transverse process of the anterior caudal vertebrae are short and L shaped, the anterior chevron is the longest among sauropods in proportion to body size, the distal ends of the anterior chevrons are rod-shaped, the distal ends of the mid chevrons are transversely thin and anteroposteriorly long without cranial processes, and the dorsal border of the shaft of the paroccipital process that forms the ventral margin of the posttemporal fenestra is short mediolaterally and V-shaped in posterior view. A phylogenetic analysis suggests that T. amicitiae is a basal titanosauriform, possibly belonging to the East Asian endemic clade Euhelopodidae. The caudals and chevrons are described in detail in order to document highly autapomorphic features of the new taxon as well as potentially phylogenetically informative characters. The discovery of T. amicitiae suggests that East Asian basal titanosauriforms were diverse not only in the number of the taxa but also in the morphological variation of the caudal elements. SN - 1175-5334 UR - https://www.unboundmedicine.com/medline/citation/25112425/A_new_titanosauriform_sauropod__Dinosauria:_Saurischia__from_the_Lower_Cretaceous_of_Hyogo_Japan_ DB - PRIME DP - Unbound Medicine ER -
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