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Description of Caenoephemera shangyuanensis, gen.nov., sp.nov. (Ephemeroptera), from the Yixian Formation

Published online by Cambridge University Press:  31 May 2012

Qi-Bin Lin  and
Di-Ying Huang
Qi-Bin Lin*
Affiliation:
Nanjing Institute of Geology and Paleontology, Academia Sinica, 210008, Nanjing, People's Republic of China
Di-Ying Huang
Affiliation:
Nanjing Institute of Geology and Paleontology, Academia Sinica, 210008, Nanjing, People's Republic of China
*
1 Author to whom all corresponding should be addressed (E-mail: [email protected]).
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Abstract

A fossil mayfly nymph Caenoephemera shangyuanensis, gen.nov., sp.nov., discovered in the lower part of the Upper Jurassic – Lower Cretaceous Yixian Formation of Jianshangou, Beipiao district, West Liaoning, China, is described. It has several archaic features typical of Paleozoic mayfly nymphs, such as 5 tarsal segments and hind wing pads not covered by fore wing pads, but also exhibits specialized modern features, such as a short metathorax, abdominal tracheal gills, and cerci. It appears to be intermediate in structure between Paleozoic and extant mayfly nymphs.

Résumé

On trouvera ici la description de Caenoephemera shangyuanensis, gen.nov., sp.nov., à partir d’une larve d’éphémère fossile découverte à la base de la formation Yixian (Jurassique supérieur – Crétacé inférieur, Jianshangou, district de Beipiao, Ouest Liaoning, Chine). Ce fossile présente non seulement plusieurs caractères archaïques typiques des éphémères paléozoïques comme des tarses à 5 articles et des fourreaux d’ailes postérieures non couverts par ceux des ailes antérieures, mais également des structures nettement "modernes" comme un métathorax court, des branchies abdominales et des cerques. Ce fossile semble être "intermédiaire" entre les éphémères paléozoïques et modernes.

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 6 , December 2001 , pp. 747 - 754
Copyright
Copyright © Entomological Society of Canada 2001

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