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Odonatan endophytic oviposition from the Eocene of Patagonia: The ichnogenus Paleoovoidus and implications for behavioral stasis

Published online by Cambridge University Press:  14 July 2015

Laura C. Sarzetti ,
Conrad C. Labandeira ,
Javier Muzón ,
Peter Wilf ,
N. Rubén Cúneo ,
Kirk R. Johnson  and
Jorge F. Genise
Laura C. Sarzetti
Affiliation:
1CONICET, Museo Paleontologico Egidio Feruglio, Avenida Fontana 140, Trelew, Chubut 9100, Argentina, , and
Conrad C. Labandeira
Affiliation:
2Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, 20213-7012 3Department of Entomology, University of Maryland, College Park, Maryland 20742,
Javier Muzón
Affiliation:
4Instituto de Limnologia “Dr. Raul A. Ringuelet,” Av. Calchaqui Km 23,5 712, Florencio Varela, Buenos Aires, Argentina, 1888,
Peter Wilf
Affiliation:
5Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania, 16802,
N. Rubén Cúneo
Affiliation:
1CONICET, Museo Paleontologico Egidio Feruglio, Avenida Fontana 140, Trelew, Chubut 9100, Argentina, , and
Kirk R. Johnson
Affiliation:
6Department of Earth Sciences, Denver Museum of Nature and Science, Denver, Colorado 80205,
Jorge F. Genise
Affiliation:
1CONICET, Museo Paleontologico Egidio Feruglio, Avenida Fontana 140, Trelew, Chubut 9100, Argentina, , and
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Abstract

We document evidence of endophytic oviposition on fossil compression/impression leaves from the early Eocene Laguna del Hunco and middle Eocene Rio Pichileufu floras of Patagonia, Argentina. Based on distinctive morphologies and damage patterns of elongate, ovoid, lens-, or teardrop-shaped scars in the leaves, we assign this insect damage to the ichnogenus Paleoovoidus, consisting of an existing ichnospecies, P. rectus, and two new ichnospecies, P. arcuatum and P. bifurcatus. In P. rectus, the scars are characteristically arranged in linear rows along the midvein; in P. bifurcatus, scars are distributed in double rows along the midvein and parallel to secondary veins; and in P. arcuatum, scars are deployed in rectilinear and arcuate rows. In some cases, the narrow, angulate end of individual scars bear a darkened region encompassing a circular hole or similar feature indicating ovipositor tissue penetration. A comparison to the structure and surface pattern of modern ovipositional damage on dicotyledonous leaves suggests considerable similarity to certain zygopteran Odonata. Specifically, members of the Lestidae probably produced P. rectus and P. bifurcatus, whereas species of Coenagrionidae were responsible for P. arcuatum. Both Patagonian localities represent an elevated diversity of potential fern, gymnosperm, and especially angiosperm hosts, the targets of all observed oviposition. However, we did not detect targeting of particular plant families. Our results indicate behavioral stasis for the three ovipositional patterns for at least 50 million years. Nevertheless, synonymy of these oviposition patterns with mid-Mesozoic ichnospecies indicates older origins for these distinctive modes of oviposition.

Type
Research Article
Information
Journal of Paleontology , Volume 83 , Issue 3 , May 2009 , pp. 431 - 447
Copyright
Copyright © The Paleontological Society 

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