Abstract
A new species, Lasiosmylus longus sp. n., is described from the Early Cretaceous Yixian Formation of Huangbanjigou Village, Liaoning Province, China. Based on the characters of the new species and nine new specimens of Lasiosmylus newi Ren & Guo, 1996, the generic diagnosis of Lasiosmylus is emended and the taxonomic position of Lasiosmylus Ren & Guo, 1996 is re-evaluated, and Lasiosmylus should be assigned to the ithonid genus-group.
Highlights
The genus Lasiosmylus Ren & Guo, 1996 was initially assigned to the subfamily Spilosmylinae in Osmylidae. Makarkin et al (2012, 2014) transferred it to Ithonidae sensu lato, but without discussing the relationship of the genus to other genera within the family
It is widely accepted that Ithonidae comprise three lineages: ithonid genus-group, polystoechotid genus-group, and rapismatid genus-group, the interrelationships among these groups, especially for fossil taxa, are still not fully resolved (Winterton and Makarkin 2010, Makarkin et al 2014, Zheng et al 2016)
Most fossil taxa have been attributed to Ithonidae sensu lato without further systematic placement (Archibald and Makarkin 2006, Makarkin et al 2014)
Summary
The genus Lasiosmylus Ren & Guo, 1996 was initially assigned to the subfamily Spilosmylinae in Osmylidae. Makarkin et al (2012, 2014) transferred it to Ithonidae sensu lato, but without discussing the relationship of the genus to other genera within the family.
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