期刊
GONDWANA RESEARCH
卷 27, 期 3, 页码 1068-1078出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.gr.2014.08.014
关键词
Mosasauridae; Palaeobiodiversity; Palaeobiogeography; Palaeoecology; New 'Crush-Cut'; Tooth morphoguild; Niche partitioning
资金
- Ministerio de Economia y Competitividad of Spain (MINECO project) [CGL2010-18851/BTE]
- Gobierno Vasco/Eusko jaurlaritza (research group) [IT834-13]
Mosasaurid squamates are the most numerically abundant, and taxonomically/ecologically diverse clade of marine amniotes represented in the Maastrichtian Phosphates of Morocco. With few exceptions, they are faunally typical of the Southern Mediterranean Tethys Margin (around palaeolatitude 25 degrees N) and range from the base to the top of the stage. The Moroccan assemblages include at least 7 genera and 10 species representing a broad spectrum of sizes and morphologies that illustrate several ecological trends. Noteworthy is the predominance of Mosasaurinae which are widespread in contemporaneous outcrops worldwide and constitute 80% and 70% of the total genus/species number respectively. In contrast, Halisauromorpha and Russellosaurina (plioplatecarpines) are scarce and tylosaurines are presently unknown. All of the Moroccan mosasaurids exhibit characteristic tooth morphologies and can be placed into resource partitioning morphoguilds indicative of adaptations for piercing, crushing or cutting. Medium to large predators are found to distribute along the 'Crush'-'Cut' axis of the morphoguild projection, and a new 'Crush-Cut' guild, previously unrecognised amongst Mesozoic marine amniotes, accommodates several Prognathodon species. Also of importance is the lack of mosasaurids along the 'Pierce'-'Crush' axis, potentially inferring that these ecological niches were occupied by other marine vertebrates such as selachians and plesiosaurians. In addition, the relative abundance of mosasaurids throughout the Maastrichtian series of the Gantour Basin evidences direct ecological competition or predation phenomena. (C) 2014 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
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