Ein neuer Insektenfund aus dem Westfalium von Ibbenbüren (Westdeutschland)

From rocks of Westphalian D age of Ibbenbueren in Westphalia/W-Germany a new taxon of the Omaliidae Handlirsch, 1906 -Kelleropteron kaelberbergense n. g., n. sp. — is described. It is represented by only one wing. The new genus is characterized by the following features: the subcosta ends on the costa; the radius is very prominent and runs far distantly from the anterior border of the wing proximally; the branches of the sector radii and the medialis are directed distally, not posteriorly; a connective vein between medialis and sector radii is present; the cross-veins are relatively dense and irregularly branched. The Omaliidae are redefined, the relationships of their genera are discussed. The genera are arranged in 3 groups (Fig. 1). In theHeterologies-group - as in the Paoliidae — the subcosta ends on the radius; in theCacurgus — group the subcosta ends on the costa, a connective vein between medialis and sector radii is not present; in theOmalia- group the subcosta also ends on the costa, but a connective vein between medialis and sector radii has evolved.Kelleropteron is a member of the last group, differing fromOmalia above all by its denser, more irregularly arranged cross-veins. The Omaliidae are confined stratigraphically to the Westphalian and geographically to the EuropeanNorthamerican region. They apparently are descendants of the Paoliidae Handlirsch, 1906. In both families a connective vein between medialis and cubitus is present, and the anterior branch of the medialis is lost. The most important difference between them is seen in the cross-veins: within the Paoliidae they are very dense, similar to the archedictyon of the Palaeodictyoptera, but within the Omaliidae they are more widemeshed and more prominent.