Exceptional preservation of marine diatoms in upper Albian amber

Vincent Girard (1) , Simona Saint-Martin (2) , Jean-Paul Saint-Martin (2) , Alexander-R. Schmidt (3) , Steffi Struwe (4) , Vincent Perrichot , Gérard Breton (1) , Didier Neraudeau (1)

1 GR - Géosciences Rennes
2 Paléobiodiversité et paléoenvironnements
3 Courant Research Centre Geobiology
4 Museum für Naturkunde [Berlin]

Late Albian amber from Charente-Maritime (southwestern France) contains the first known marine diatoms preserved in a fossil resin. Approximately 70 inclusions were assignable to the genera Basilicostephanus, Coscinodiscus, Hemiaulus, Melosira, Paralia, Skeletonema, Stephanopyxis, Trochosira, ?Aulacoseira, and to the order Rhizosoleniales. Some of them are represented by several species. This diatom assemblage is mainly composed of colonial planktonic genera, which are typical for coastal shallow waters. The newly found amber inclusions extend the fossil record of four genera and one order from the Late Cretaceous and support certain molecular phylogenetic assumptions regarding the diversifi cation of marine diatoms in the Early Cretaceous. The unusual introduction of diatom shells from the beach or sea by wind, spray, or high tide onto the resin fl ows was possible because the amber forest grew close to the seashore.

Domaines: Paléontologie

Vincent Girard, Simona Saint-Martin, Jean-Paul Saint-Martin, Alexander-R. Schmidt, Steffi Struwe, et al.. Exceptional preservation of marine diatoms in upper Albian amber. Geology, 2009, 37 (1), pp.83-86. ⟨insu-00352940⟩