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Chemosynthesis-based associations on Cretaceous plesiosaurid carcasses

100%

Kaim A., Kobayashi Y., Echizenya H., Jenkins R. G., Tanabe K.

Acta Palaeontologica Polonica

2008

tom 53

nr 1

The objective of this report is to document first Mesozoic occurrences of chemosynthesis−based communities developed on large marine reptile carcasses. Micro−grazing provannid gastropods (typical of chemosynthetic communities) are associated with plesiosaurid skeletons in the Upper Cretaceous deposits of Hokkaido, northern Japan. The cancellous bones of the examined plesiosaurid bones contain a ubiquity of iron sulfides within the bone trabeculae, which provides evidence of anaerobic sulfate reduction of the bone lipids. We also report numerous microborings in the bone trabeculae, which might result from the activity of sulfur−oxidizing bacteria. This finding addresses the hotly debated problem of the emergence and radiation of whale bone faunas. We postulate that vertebrate bone environments in the Northwest Pacific region were settled repeatedly by animals from a regional pool of chemosynthesis−based communities that flourished in the methane seeps and/or hot vents that were present during the Late Cretaceous–Miocene.

Antiquity of the substrate choice among acmaeid limpets from Late Cretaceous chemosynthesis-based communities

80%

Jenkins R. G., Kaim A., Hikida Y.

Acta Palaeontologica Polonica

2007

tom 52

nr 2

Two Campanian methane seep sites in the Nakagawa area of Hokkaido (northern Japan) yield fossils of the limpet genera Serradonta and Bathyacmaea that appear to have had the same substrate preference as do their modern counterparts. Serradonta cf. vestimentifericola was a species having an elongated and strongly compressed shell adapted to living on vestimentiferan tubes, like its modern relatives. Bathyacmaea cf. subnipponica was an acmaeid with a relatively elongated shell but with a more rounded aperture than Serradonta and thus apparently attached to small hard objects other than worm tubes. One Bathyacmaea specimen was found attached in situ to an ataphrid gastropod shell. The restricted present−day distribution of Serradonta possibly reflects its spreading route exclusively through the hot vent and cold seep communities settled by vestimentiferans.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Jenkins R. G.

2 Kaim A.

1 Echizenya H.

1 Hikida Y.

1 Kobayashi Y.

1 Tanabe K.

1 2008

1 2007

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Chemosynthesis-based associations on Cretaceous plesiosaurid carcasses

Antiquity of the substrate choice among acmaeid limpets from Late Cretaceous chemosynthesis-based communities