New pelecinid wasps (Hymenoptera: Pelecinidae) from the Yixian Formation of western Liaoning,China |
| |
Affiliation: | 1. School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China;2. College of Life Sciences, Capital Normal University, Beijing 100048, China;3. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA;4. Department of Entomology, University of Maryland, College Park 21740, USA |
| |
Abstract: | A new species, Shoushida infera sp. nov. and a new genus with a new species, Stelepelecinus longus gen. et sp. nov., both in Pelecinidae, are described and illustrated. All specimens were collected from the Lower Cretaceous of Yixian Formation, Jehol Biota at Huangbanjigou, Beipiao City, western Liaoning Province, China. The forewing of Shoushida infera sp. nov. has a rudimentary “X” pattern, formed by veins of Rs, Rs1, Rs2 and 2r-rs, which is similar to but slightly different from that of Shoushida regilla Liu, Shih et Ren, 2009. Consistent with the phylogeny of Pelecinidae reported by Shih et al., 2010, this new species and S. regilla represent a transition between basal and crown pelecinids and the rudimentary “X” pattern evolved later to a more developed and robust “X” pattern in more derived pelecinids. In addition, the long petiole of the basalmost segment of metasoma, present in the male Stelepelecinus longus gen. et sp. nov., is documented for the first time, suggesting a likely Early Cretaceous origination of metasomal evolution leading to the thin and long petiole structure in the extant male Pelecinus thoracicus. We proposed two probable pathways of the transformation of the pelecinid male metasoma from the most plesiomorphic state to the more apomorphic states. |
| |
Keywords: | New genus New species Lower Cretaceous Huangbanjigou Jehol Biota |
本文献已被 ScienceDirect 等数据库收录! |
|