A new species of Isotomurus (Collembola: Isotomidae) without trichobothria

Abstract

The paper provides a description of Isotomurus chaos sp.n., which, contrary to all known species of the genus excepting I. antennalis Bagnall, 1940, completely lacks trichobotria, the main differen- tiating character of the genus. Both these species pos- sess a number of other common characters which are unique to the genus but clearly differ in coloration, mucronal seta and more complete setal cover on poste- rior side of dens in the new species.