Capnia quadrangularis Aubert, 1946

Capnia quadrangularis Aubert, 1946 — Aubert 1946: 22. (nomen novum for Capnia nigra sensu Morton 1896, and complementary description of the larva).

Capnia bifrons (Newman, 1838) — Kimmins 1947: 261. (synonymy of Capnia quadrangularis Aubert, 1946 with Capnia bifrons (Newman, 1838) .

This name was given as a nomen novum for C. nigra sensu Morton 1896 . Unfortunatelly, a type was not designated. Morton (1896) referred to British, Austrian, Czech, and Turkestan specimens without further specification. He provided an illustration of a Scottish (obviously Z. bifrons) and of a Turkestan specimen (the later holotype of Z. turkestanica). Thus, the name C. quadrangularis cannot be attributed to a certain species and must be regarded as a nomen dubium.