Abstract
Two new species of Mongolbittacus Petrulevičius, Huang & Ren, 2007, Mongolbittacus speciosus sp. n. and Mongolbittacus oligophlebius sp. n., and two new species of Exilibittacus Yang, Ren & Shih, 2012, Exilibittacus foliaceus sp. n. and Exilibittacus plagioneurus sp. n., in the family Bittacidae, are described and illustrated based on five well-preserved fossil specimens. These specimens were collected from the late Middle Jurassic Jiulongshan Formation of Daohugou, Inner Mongolia, China. These new findings enhance our understanding of the morphological characters of early hangingflies and highlight the diversity of bittacids in the Mid Mesozoic ecosystems.
Highlights
Bittacidae, a large family of Mecoptera commonly called hangingflies, live mainly in the temperate or warm tropical climates
Mongolbittacus speciosus sp. n. (Figs 1–4) is assigned to the genus Mongolbittacus based on the following generic diagnostic characters: R4+5 plus R4 distinctively curved; M4 simple; the ‘bittacid cross’ not aligned; wide posterior anal field; and the forking of M proximad of the Rs forking
Mongolbittacus oligophlebius sp. n. (Figs 5, 6) is assigned to the genus Mongolbittacus based on the following generic diagnostic characters: R4+5 plus R4 distinctively curved; M4 simple; the ‘bittacid cross’ not aligned; posterior anal field broad; and 2A bending sharply and reaching the posterior margin
Summary
Bittacidae, a large family of Mecoptera commonly called hangingflies, live mainly in the temperate or warm tropical climates. N. (Figs 1–4) is assigned to the genus Mongolbittacus based on the following generic diagnostic characters: R4+5 plus R4 distinctively curved; M4 simple; the ‘bittacid cross’ not aligned; wide posterior anal field; and the forking of M proximad of the Rs forking.
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