New earwig nymphs (Dermaptera: Pygidicranidae) in mid-Cretaceous amber from France

A new genus and species of earwig is described and figured from Early Cretaceous (Latest Albian­Earliest Cenomanian) amber of southwestern France. The holotype was studied using traditional light microscopy as well as through propagation phase contrast X-ray synchrotron microtomography, rendering high resolution three-dimensional models for critical examination. Gallinympha walleri Perrichot & Engel, new genus and species, is represented by two late instar nymphs missing only portions of the abdomen, as well as most of the head for the paratype. The genus is a member of the Pygidicranidae, one of the most basal of living earwigs, and is distinguished from other taxa in the family. A thorough account of the specimen's morphology is provided along with a detailed comparison with similar structures across a diversity of primitive earwig lineages.

[1]  D. Néraudeau,et al.  Un nouveau gisement à ambre insectifère et à végétaux (Albien terminal probable) : Archingeay (Charente-Maritime, France) , 2002 .

[2]  D. Grimaldi,et al.  A PRIMITIVE EARWIG IN CRETACEOUS AMBER FROM MYANMAR (DERMAPTERA: PYGIDICRANIDAE) , 2004 .

[3]  Peter Cloetens,et al.  Phase Contrast X-Ray Synchrotron Imaging: Opening Access to Fossil Inclusions in Opaque Amber , 2008, Microscopy and Microanalysis.

[4]  M. Engel.  Gregarious behaviour in Cretaceous earwig nymphs (Insecta, Dermaptera) from southwestern France , 2009 .

[5]  F. Haas,et al.  Phylogeny of earwigs (Insecta: Dermaptera) based on molecular and morphological evidence: reconsidering the classification of Dermaptera , 2005 .

[6]  E. Masure,et al.  Analyse palynologique de l’argile lignitifère à ambre de l’Albien terminal d’Archingeay (Charente-Maritime, France) , 2005 .

[7]  M. Burr.  IX. Dermaptera (Earwigs) preserved in Amber, from Prussia. , 1911 .

[8]  D. Ren,et al.  Transitional fossil earwigs - a missing link in Dermaptera evolution , 2010, BMC Evolutionary Biology.

[9]  F. Haas,et al.  Dermaptera hindwing structure and folding: New evidence for familial, ordinal and superordinal relationships within Neoptera (Insecta) , 2001 .

[10]  V. Perrichot.  Early Cretaceous amber from south-western France: insight into the Mesozoic litter fauna , 2004 .

[11]  G. K. Srivastava.  Notes on some Dermaptera from Australia preserved in the Zoölogisch Museum, Amsterdam , 1985 .

[12]  F. Schulze,et al.  Das Tierreich : eine Zusammenstellung und Kennzeichnung der rezenten Tierformen , 1931, Nature.

[13]  A. V. Gorokhov,et al.  History of Insects , 2002, Springer Netherlands.

[14]  A. Bravin,et al.  Applications of X-ray synchrotron microtomography for non-destructive 3 D studies of paleontological specimens , 2006 .

[15]  D. Grimaldi,et al.  Evolution of the insects , 2005 .

[16]  D. Batten,et al.  Megaspores from mid Cretaceous deposits in western France and their biostratigraphic and palaeoenvironmental significance , 2010 .

[17]  K. Klass,et al.  Reproductive Biology and Nymphal Development in the Basal Earwig Tagalina papua (Insecta: Dermaptera: Pygidicranidae), with a Comparison of Brood Care in Dermaptera and Embioptera , 2005 .

[18]  M. Engel,et al.  Laasbium Scudder: A Genus of Tertiary Earwigs, Not Rove Beetles, and the Classification of Florissant Fossil Dermaptera (Insecta) , 2010 .