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Evolutionary stasis in enigmatic jacobsoniid beetles

Yamamoto, Shûhei and Takahashi, Yui and Parker, Joseph (2017) Evolutionary stasis in enigmatic jacobsoniid beetles. Gondwana Research, 45 . pp. 275-281. ISSN 1342-937X. doi:10.1016/

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Jacobsoniidae is a small but perplexing beetle family, with unknown phylogenetic relationships to other polyphagan Coleoptera. To date, only a single fossil jacobsoniid has been described, from Eocene Baltic amber (~ 40 Ma). Here, we push back the oldest definitive record of Jacobsoniidae by approximately 60 million years with a new fossil species recovered from mid-Cretaceous (~ 99 Ma) Burmese amber from Myanmar. Remarkably, exploration of the fossil's morphology with confocal laser scanning microscopy revealed that it belongs to an extant genus, Derolathrus. The similarity of the new taxon, Derolathrus abyssus n. sp., to modern congeners provides a striking example of morphological stability over deep evolutionary time—a possible outcome of long-term persistence of mesic microhabitats, a hypothesis we argue is supported by a variety of other Recent, litter-inhabiting arthropod taxa now known to be largely unchanged since the Mesozoic. Many such examples belong to the Staphylinoidea—a hyperdiverse beetle superfamily that dominates contemporary mesic habitats, and with which Jacobsoniidae may have a close phylogenetic relationship.

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Parker, Joseph0000-0001-9598-2454
Additional Information:© 2017 International Association for Gondwana Research. Published by Elsevier B.V. Received 11 September 2016, Revised 19 December 2016, Accepted 22 December 2016, Available online 12 February 2017.
Subject Keywords:Jacobsoniidae; Coleoptera; Bradytely; Evolutionary stasis; Amber
Record Number:CaltechAUTHORS:20180116-092535840
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Official Citation:Shûhei Yamamoto, Yui Takahashi, Joseph Parker, Evolutionary stasis in enigmatic jacobsoniid beetles, Gondwana Research, Volume 45, 2017, Pages 275-281, ISSN 1342-937X,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84334
Deposited By: Tony Diaz
Deposited On:17 Jan 2018 18:02
Last Modified:15 Nov 2021 20:18

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