Description: Cluster of gastroliths with variable grain sizes in the aquatic tangasaurid Hovasaurus from the Upper Permian Sakamena Formation of southern Madagascar (NHMS WP1499). Date: 2007. Source:
http://www.app.pan.pl/article/item/app52-001.html. Author: Oliver Wings. Permission (
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Acta Palaeontologica Polonica journal.
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