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Shards, sequences, and shorelines: two new species of Bembidion from North America (Coleoptera: Carabidae)

Citation

Maddison, David (2020), Shards, sequences, and shorelines: two new species of Bembidion from North America (Coleoptera: Carabidae), Dryad, Dataset, https://doi.org/10.5061/dryad.18931zcw1

Abstract

Two new species of Bembidion are described from river shores in North America.  One, Bembidion mimbres sp. nov., from the Gila River watershed in the lands of the Mimbres culture in New Mexico and Arizona, is closely related to the widespread Bembidion levigatum. DNA sequences from several linkage groups provide evidence of the distinctiveness of B. mimbres. The second, Bembidion corgenoma sp. nov., has been the subject of recent genomic and transcriptomic studies.  It belongs in the Bembidion transversale subgroup, and occurs from California north to British Columbia, east to Montana and Nevada. The B. transversale subgroup as a whole is reviewed, and characters that distinguish B. corgenoma from the similar and sympatric B. transversale and B. erosum are described and illustrated.  DNA sequences of these three species show no consistent differences in 28S, COI, CAD, and Topoisomerase, and a coalescent species delimitation analysis reveals no notable structure within the complex. This is the first known trio of species within Bembidion for which those genes provide no clear signal of species boundaries. A neotype is designated for the one name in the group that lacks a primary type, Bembidium haplogonum Chaudoir. Chromosomes of the new species and their relatives are as is typical for Bembidion, with 11 pairs of autosomes and an XY/XX sex chromosome system.

Methods

Extracted DNA was subjected to PCR, and the products Sanger sequenced.  Maximum likelihood analysis was conducted using IQ-TREE . 

Funding

National Science Foundation, Award: DEB-1258220

Harold E. and Leona M. Rice Endowment Fund at Oregon State University

Harold E. and Leona M. Rice Endowment Fund at Oregon State University