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Article Dans Une Revue Proceedings of the Royal Society B: Biological Sciences Année : 2007

New sea spiders from the Jurassic La Voulte-sur-Rhône Lagerstätte

Résumé

The diverse and exceptionally well-preserved pycnogonids described herein from the Middle Jurassic La Voulte Lagerstätte fill a 400 Myr gap of knowledge in the evolutionary history of this enigmatic group of marine arthropods. They reveal very close morphological and functional (locomotion, feeding) similarities with present-day pycnogonids and, by contrast, marked differences with all Palaeozoic representatives of the group. This suggests a relatively recent, possibly Mesozoic origin for at least three major extant lineages of pycnogonids (Ammotheidae, Colossendeidae, Endeidae). Combined evidence from depositional environment, faunal associates and recent analogues indicate that the La Voulte pycnogonids probably lived in the upper bathyal zone (ca 200 m). Our results point to a remarkable morphological and ecological stability of this arthropod group over at least 160 Myr and suggest that the colonization of the deep sea by pycnogonids occurred before the Jurassic.

Domaines

Paléontologie

Dates et versions

hal-00293732 , version 1 (07-07-2008)

Identifiants

Citer

Sylvain Charbonnier, Jean Vannier, B. Riou. New sea spiders from the Jurassic La Voulte-sur-Rhône Lagerstätte. Proceedings of the Royal Society B: Biological Sciences, 2007, 274, pp.2685-2691. ⟨10.1098/rspb.2007.0848⟩. ⟨hal-00293732⟩
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