A revision of Mesypochrysa intermedia (Neuroptera: Chrysopidae) and the evolution of Chrysopidae in the Mesozoic
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Abstract:
The genus Mesypochrysa Martynov, 1927 (Neuroptera: Chrysopidae: Limaiinae) is the oldest genus in the subfamily Limaiinae. The species of this genus can be identified by the numbers of basal subcostal crossveins (0–2), the branches of Rs (7–26), m-cu crossveins (2, 3), the pectinate branches of CuA+MP (4–7), and the pattern of forking of 1A and 2A (forked or not) in the forewing. Mesypochrysa intermedia Panfilov, 1980 is characterized by the presence of one basal subcostal crossvein in the forewing; Rs with about 14 branches; the presence of 1m-cu crossvein; CuA+MP with 6 distal pectinate branches; and 1A, 2A not being forked. Many specimens of this species have been found, but most of them are preserved with only forewings, except one specimen of Mesypochrysa cf. intermedia (NIGP 161886) which has an incomplete hind wing. A new specimen with nearly complete forewings and hind wings of this species was collected from the Middle Jurassic Jiulongshan Formation in Daohugou Village, Ningcheng County, Chifeng City, Inner Mongolia, China. Based on observation of this specimen, we revise the diagnosis of Mesypochrysa intermedia. The recorded specimens of M. intermedia, the differences between the genus Mesypochrysa and other genera of the Mesozoic, as well as the characteristics of each species of Mesypochrysa are also discussed in detail.
