The deep-soil sampling in Chile revealed a new elateroid beetle lineage, Badmaateridae fam. nov. (Coleoptera)

These are high-resolution photograps whose compressed versions were included in the supplements of the study:

Vasily V. Grebennikov, Dominik Kusy, Michal Motyka, Carmelo Andújar, Gabriel Biffi, and Ladislav Bocak,

The deep-soil sampling in Chile revealed a new elateroid beetle lineage, Badmaateridae fam. nov. (Coleoptera)

under consideration in Systematic Entomology 

Abstrac

Deep-soil arthropods remain one of the least studied components of terrestrial biodiversity, and we present, as an exciting discovery, a new endogean beetle collected by floating deep soil samples in Chile. We analyzed a 4,203-ortholog dataset using both maximum likelihood and coalescent methods to infer its relationships. Regardless of the analytical setup, Badmaater was recovered as the sister to the clade consisting of Lycidae, Cantharidae, Elateridae, and the lampyroids. The distant position of Badmaater relative to the previously described elateroid families is confirmed by additional analyses of differently sampled, although less phylogenetically informative, 66-gene and mitogenome datasets. As a result, we describe Badmaater chilensissp. and gen. nov. in Badmaateridae fam. nov. (Coleoptera: Elateroidea). Badmaater resembles other clicking elateroids, but has a three-segmented antennal club, slender palpi, and globular metacoxae that are situated close to each other. It is blind, wingless, and extremely small-bodied. We date the origin of Badmaateridae to the Triassic. The ancient origin of Badmaateridae suggests that this lineage has probably survived all disturbances shaping modern life, from the Triassic/Jurassic volcanic activity to the end-Cretaceous asteroid impact and subsequent Cenozoic and Quaternary climatic fluctuations. However, Badmaateridae is now one of the few beetle families with only a single species restricted to a narrow range. Deep-soil dwelling Badmaatersurvived in a relatively high-latitude area periodically affected by close glaciers and separated from the tropics by an arid zone. Badmaater, as a wingless deep-soil beetle occurring in a restricted area, has a limited dispersal propensity and consequently faces an inherent risk during turbulent environmental changes.