The First Twisted-Wing Parasitoids (Insecta: Strepsiptera) from the Early Eocene Green River Formation of Colorado

IF 2.2 4区哲学 Q2 BIODIVERSITY CONSERVATION

Bulletin of the Peabody Museum of Natural History Pub Date : 2016-10-10 DOI:10.3374/014.057.0204

Gwen S. Antell, J. Kathirithamby

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引用次数: 7

Abstract

Abstract Strepsiptera is a clade of entomophagous parasitoid insects with fewer than 30 previously reported fossils. Two new species of Caenocholax (Strepsiptera: Myrmecolacidae) described here represent the first reported adult strepsipterans preserved as organic compression fossils. Their occurrence in the Early Eocene (about 50 Ma) Green River Formation (Colorado, USA) is the northernmost New World record of Myrmecolacidae and the oldest record of Caenocholax. Caenocholax barkleyi sp. nov. and Caenocholax palusaxus sp. nov. are each known from one adult male. The aedeagus of C. barkleyi lacks a median projection and terminates in two hooks, an apomorphy of the species. Caenocholax palusaxus has distinctly intermediate wing vein density and a larger ratio of antennomere 6 to antennomere 7 than any other species of Caenocholax. The fossils reported here expand the known insect biota of the formation in taxonomic richness as well as the fossil record of Strepsiptera in space and time. Moreover, the Eocene specimens hint at an unappreciated fossil diversity of endoparasitic insects.

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美国科罗拉多州始新世早期绿河组发现的第一批扭翅类寄生物(昆虫纲:链翅目)

摘要链翅目是食虫寄生昆虫的一个分支，目前报道的化石不到30个。本文描述的两个新种是首次报道的以有机压缩化石形式保存下来的成年链毛虫(链翅目:桃蚜科)。它们出现在早始新世(约50 Ma)的美国科罗拉多州绿河组(Green River Formation, Colorado, USA)，是Myrmecolacidae科最北的新世界记录和最古老的Caenocholax记录。11月barklei Caenocholax sp.和11月palusaxus Caenocholax sp.分别来自一个成年雄性。巴氏C. barkleyi的aedeagus缺乏中间突起，终止于两个钩，是该物种的一种拟形。palusaxus caencholax palusaxus caencholax具有明显的中等翅脉密度和较大的触角膜6与触角膜7之比。本文报道的化石在分类丰富度上扩展了该地层已知的昆虫生物群，在空间和时间上扩展了链翅目的化石记录。此外，始新世的标本暗示了一种未被认识到的内生昆虫的化石多样性。

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来源期刊

Bulletin of the Peabody Museum of Natural History BIODIVERSITY CONSERVATION-ECOLOGY

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Bulletin of the Peabody Museum of Natural History publishes original research based on specimens, artifacts and related materials maintained in the collections of the Yale Peabody Museum of Natural History’s curatorial divisions. The Bulletin is published twice a year, in April and October.