Eucnemid larvae of the Nearctic Region. Part VII: Description of the larvae of Nematodes penetrans (LeConte, 1852) (Coleoptera: Eucnemidae: Macraulacinae: Nematodini), with notes on its hypermetamorphic life cycle.


  • Robert L. Otto


false click beetles, morphology, triungulin, 5th instar, prepupal larval stage, Wisconsin


Descriptions and illustrations of the triungulin, 5th instar, and prepupal larval forms for Nematodes penetrans (LeConte, 1852) (Coleoptera: Eucnemidae: Macraulacinae: Nematodini) are given. The descriptions are based on triungulins collected in a plastic vial as well as 5th instars and prepupal larval stages collected from hard sections of sugar maple (Acer saccharum Marshall; Aceraceae) logs and limbs. Adults were reared from those pieces placed in plastic bags. Biological information is provided, based on literature search and personal observations. Comparative studies between larvae of N. penetrans and the European species, Nematodes fi lum (Fabricius, 1801) along with other Nearctic larval forms are briefl y discussed. This discovery represents the fi rst larval description for the genus in the Nearctic region.