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Head of male, dorsal view, comparison of lengths of eye-contiguity (A) and frons (B), and frontal angle (C). |
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| Part of: Ståhls G, Barkalov AV (2017) Taxonomic review of the Palaearctic species of the Cheilosia caerulescens-group (Diptera, Syrphidae). ZooKeys 662: 137-171. https://doi.org/10.3897/zookeys.662.11267 |