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. 2022 Jun 24:1108:175-188.
doi: 10.3897/zookeys.1108.85378. eCollection 2022.

Two new species of Itaphlebia (Insecta, Mecoptera, Nannochoristidae) from the late Middle Jurassic of China

Yizi Cao  1 , Xiaodan Lin  2 , Chungkun Shih  1   3 , Dong Ren  1
Affiliations

Two new species of Itaphlebia (Insecta, Mecoptera, Nannochoristidae) from the late Middle Jurassic of China

Yizi Cao et al. Zookeys. .

Abstract

Two new species of Itaphlebia Sukatsheva, 1985, I.procera sp. nov. and I.elegana sp. nov., are described and illustrated from the latest Middle Jurassic Jiulongshan Formation of Daohugou, Inner Mongolia, China. Based on fossil specimens with wings, these new species are established and assigned to Itaphlebia by a combination of three forewing characters: Sc with three branches ending at C, the four-branched Rs (R2 to R5) originating distad of M (vs. three-branched RS (R2+3 undivided) in all other fossil and extant nannochoristids), and M forking with four branches; and a hind wing character of Sc simple and short, terminating at C well before the pterostigma. Furthermore, this is the first report of long and robust setae present on the anal veins of the forewing for I.elegana sp. nov. in fossil Nannochoristidae.

Keywords: Insect fossil; Jiulongshan Formation; nannochoristid; taxonomy.

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Figures

Figure 1.
Figure 1.
Itaphlebiaprocera sp. nov., holotype, CNU-MEC-NN2009273 A photograph of holotype B line drawing of holotype C line drawing of right forewing D photograph of right wing. Scale bars: 1 mm (A–D).
Figure 2.
Figure 2.
Itaphlebiaprocera sp. nov., paratype, CNU-MEC-NN2009168 A photograph of paratype B photograph of wings C line drawing of forewing. Scale bars: 1 mm (A–C).
Figure 3.
Figure 3.
Itaphlebiaelegana sp. nov., holotype, CNU-MEC-NN2008228 p/c. A photograph of part B enlarged details of basal forewing of part, anal veins with long and robust setae (under alcohol) C enlarged details of basal hind wing of counterpart (under alcohol) D photograph of counterpart E line drawing of counterpart F Line drawing of forewing of part, anal veins with long and robust setae G line drawing of hind wing of counterpart. Scale bars: 1 mm (A–G).
Figure 4.
Figure 4.
Itaphlebiaelegana sp. nov., paratype, CNU-MEC-NN2015026 A photograph of paratype B enlarged details of base of right forewing (under alcohol) C enlarged details of base of left forewing (under alcohol) D line drawing of right forewing E line drawing of left forewing. Scale bars: 1 mm (A–E).
Figure 5.
Figure 5.
Itaphlebiaelegana sp. nov., paratype, CNU-MEC-NN2016020 p/c. A photograph of part of paratype B enlarged details of base of forewing of counterpart of paratype (under alcohol) C photograph of right forewing of part D photograph of left forewing and part of hind wing of part E line drawing of right forewing F line drawing of left forewing and part of hind wing. Scale bars: 1 mm (A–F).
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