The broad extensions at the hind legs are characteristic properties of the Macrobiotus  males.

The tardiologist Hartmut Greven writes: "... males of   Macrobiotus hufelandi   and  Hypsibius oberhaeuseri  show characteristic flat extrusions at the outer sides of their last pair of legs."

Literature

Hartmut Greven: Die Bärtierchen. p. 45. Lutherstadt Wittenberg 1980.

© Photomicrograph by  Martin Mach