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Hyžný, Matúš; Kroh, Andreas; Ziegler, Alexander; Anker, Arthur; Košťák, Martin; Schlögl, Ján; Culka, Adam; Jagt, John W M; Fraaije, René H B; Harzhauser, Mathias; van Bakel, Barry W M; Ruman, Andrej
Scientific reports, 06/2017, Volume: 7, Issue: 1Journal Article
Alpheid snapping shrimps (Decapoda: Caridea: Alpheidae) constitute one of the model groups for inferences aimed at understanding the evolution of complex structural, behavioural, and ecological traits among benthic marine invertebrates. Despite being a super-diverse taxon with a broad geographical distribution, the alpheid fossil record is still poorly known. However, data presented herein show that the strongly calcified fingertips of alpheid snapping claws are not uncommon in the fossil record and should be considered a novel type of mesofossil. The Cenozoic remains analysed here represent a compelling structural match with extant species of Alpheus. Based on the presence of several distinct snapping claw-fingertip morphotypes, the major radiation of Alpheus lineages is estimated to have occurred as early as 18 mya. In addition, the oldest fossil record of alpheids in general can now be confirmed for the Late Oligocene (27-28 mya), thus providing a novel minimum age for the entire group as well as the first reliable calibration point for deep phylogenetic inferences.
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