Eur. J. Entomol. 103 (2): 409-423, 2006 | DOI: 10.14411/eje.2006.055

The head morphology of Ascioplaga mimeta (Coleoptera: Archostemata) and the phylogeny of Archostemata

Thomas HÖRNSCHEMEYER1, Jürgen GOEBBELS2, Gerd WEIDEMANN2, Cornelius FABER3, Axel HAASE3
1 Universität GGttingen, Institut für Zoologie & Anthropologie, Abteilung Morphologie & Systematik, D-37073 GGttingen, Germany; e-mail: thoerns@gwdg.de
2 Bundesanstalt für Materialforschung (BAM), Berlin, Germany
3 Physikalisches Institut, University of Würzburg, Germany

Internal and external features of the head of Ascioplaga mimeta (Coleoptera: Archostemata) were studied with micro X-ray computertomography (µCT) and nuclear magnetic resonance imaging (NMRI). These methods allowed the reconstruction of the entire internal anatomy from the only available fixed specimen. The mouthparts and their associated musculature are highly derived in many aspects. Their general configuration corresponds to that of Priacma serrata (the only other archostematan studied in comparable detail). However, the mandible-maxilla system of A. mimeta is built as a complex sorting apparatus and shows a distinct specialisation for a specific, but still unknown, food source. The phylogenetic analysis resulted in the identification of a new monophylum comprising the genera [Distocupes + (Adinolepis +Ascioplaga)]. The members of this taxon are restricted to the Australian zoogeographic region. The most prominent synapomorphies of these three genera are their derived mouthparts.

Keywords: Archostemata, Cupedidae, phylogeny, NMR-imaging, skeletomuscular system, micro X-ray computertomography, head morphology

Received: September 27, 2005; Revised: December 12, 2005; Accepted: December 12, 2005; Published: April 6, 2006  Show citation

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HÖRNSCHEMEYER, T., GOEBBELS, J., WEIDEMANN, G., FABER, C., & HAASE, A. (2006). The head morphology of Ascioplaga mimeta (Coleoptera: Archostemata) and the phylogeny of Archostemata. EJE, 103(2), 409-423. doi: 10.14411/eje.2006.055
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