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On the systematic position and taxonomic rank of the extinct myxophagan †Haplochelus (Coleoptera)

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image of Insect Systematics & Evolution

Haplochelus georissoides was described as the first fossil myxophagan beetle. We re-evaluated the systematic position based on an extensive morphological data set. A clade †Haplochelus+Lepicerus is very strongly supported. Both genera share a number of highly unusual apomorphies. This lineage is more uniform than the myxophagan families Torridincolidae and Hydroscaphidae. Therefore, we synonymize Haplochelidae. Lepiceridae (incl. †Haplochelus) are placed as sister-group of the remaining myxophagan families. An origin of the group in the Jurassic is likely considering the systematic position of Myxophaga and Lepiceridae.


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