کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1548916 | 997763 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Two new Jurassic stoneflies (Insecta: Plecoptera) from Daohugou, Inner Mongolia, China Two new Jurassic stoneflies (Insecta: Plecoptera) from Daohugou, Inner Mongolia, China](/preview/png/1548916.png)
Two new genera and two new species of family Taeniopterygidae, Mengitaenioptera multiramis gen. et sp. nov. and Noviramonemoura trinervis gen. et sp. nov. are described. These fossils were collected from Daohugou Village (the Middle Jurassic), Inner Mongolia, China. Hitherto, these fossil species from Daohugou are the oldest taeniopterygids. Both simple and complex venations simultaneously occurred in this group, which reveals that the early diversification of taeniopterids was well underway by the Middle Jurassic. Therefore, we prefer to adopt the Comstock’s opinion that the venation of taeniopterids was derived from the simple venation of the older group (such as Palaeonemouridae) at much ancient geological time ago. Some of the descendants carried this simple venation; others evolved into complex venation with many additional crossveins and branches.
Journal: Progress in Natural Science - Volume 18, Issue 8, 10 August 2008, Pages 1039–1042