Discovery of the oldest known elmid larva (Coleoptera, Elmidae) from the Lower Eocene of Rajasthan (India, Palana Formation)

IF 1.9 Q2 ENTOMOLOGY
A. Kirejtshuk, Ramanuj Patel, R. Rana, A. Prokin, A. Nel, M. Jäch
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引用次数: 0

Abstract

A single elmid larva is reported from a laminate maroon shale bed of Gurha opencast lignite mine (Palana Formation, early Eocene, Bikaner District, north-western Rajasthan, India). It is the first fossil larva that can be attributed to Elmidae with certainty. A generic assignation is not possible, because the larva is strongly compressed, and the most important characters are not visible or poorly preserved. The larva is described morphologically and illustrated by photographs and line drawings. A larva of a holometabolous insect from Baltic amber, which was published recently as a member of Elmidae by Zippel et al. (2022), possesses no structural characters that would clearly suggest placement in this family. A photograph of the hitherto unknown larva of the extant Grouvellinus rioloides from Kyrgyzstan is included for comparison.
拉贾斯坦邦下始新世(印度,巴拉那组)发现已知最古老的elmid幼虫(鞘翅目,Elmide)
据报道,Gurha露天褐煤矿(Palana组,始新世早期,印度拉贾斯坦邦西北部Bikaner区)的层压板褐红色页岩床上有一只elmid幼虫。这是第一个可以肯定地归属于Elmide的幼虫化石。由于幼虫被强烈压缩,最重要的特征不可见或保存不佳,因此不可能进行一般性的划分。幼虫的形态描述,并通过照片和线条图进行说明。Zippel等人最近将波罗的海琥珀中一种全代谢组昆虫的幼虫作为榆树科的一员发表。(2022),该幼虫不具有明确表明其属于该科的结构特征。为了进行比较,还附上了一张迄今为止未知的吉尔吉斯斯坦现存三倍Grouvellinus rioloides幼虫的照片。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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