Center for Systematic Entomology, Gainesville, Florida



Robert L. Otto

Date of this Version



Otto RL. 2021. A review of the Nearctic species of Nematodes (Coleoptera: Eucnemidae: Macraulacinae: Nematodini) with a description of one new species. Insecta Mundi 0881: 1–19.


Copyright held by the author(s). This is an open access article distributed under the terms of the Creative Commons, Attribution Non-Commercial License,

Published on August 27, 2021 by Center for Systematic Entomology, Inc. P.O. Box 141874 Gainesville, FL 32614-1874 USA


The Nearctic species of Nematodes Berthold (Coleoptera: Eucnemidae: Macraulacinae: Nemato­dini) are reviewed. Four species are redescribed. One new species, Nematodes rugosipennis Otto (Coleoptera: Eucnemidae) is described from Florida, Georgia, and Oklahoma, USA. A key to species modified from Mu­ona (2000) is provided for all known species of Nematodes present in the Nearctic region.

While identifying false click beetles (Coleoptera: Eucnemidae) in the Florida State Collection of Arthropods, I discovered a new species of Nematodes Berthold collected in Florida. Additional specimens of the new species were identified from the Carnegie Museum of Natural History, California Department of Food and Agriculture, Kyle Schnepp’s personal collection, and the collection of the Global Eucnemid Research Project. Between this discovery of a new species of Nematodes Berthold, a forthcoming global review of a tribe within the subfamily Eucneminae, and additional studies adding new records of exotic species present in the United States, the known eucnemid fauna continues to grow in the region. To date, the temperate Nearctic region north of Mexico has approached at least 100 species, placing the region in the same league along with other subtropical and tropical countries. In the years to come, more new eucnemid discoveries are bound to take place, adding to the already growing number of species known in the region. Nematodes is a moderately large group consisting of 48 species, including a number of undescribed species in the Neotropical and Oceanic regions (Otto 2017). The group is primarily distributed in the Neotropical region, with a small number of species in other regions around the globe. Five described species, including the species described here, are distributed in eastern North America, north of Mexico. Twenty-three described species are found in the Neotropical region, including the Caribbean Islands. One species occurs in much of Europe and Russia. Two species are distributed along the eastern coastline of the Australian continent. One species is present on the African continent. Nine species are represented in Southeast Asia, including Japan.