Subgenus Dimetrotina Casey, 1911 of the genus Atheta

Dimetrotina Casey, 1911: 143 (as subgenus in the genus Dimetrota Mulsant & Rey, 1873; type species of Dimetrotina: Dimetrota (Dimetrotina) vaniuscula Casey, 1911, by monotypy)

Mycetota Ádám, 1987: 13 (as genus; type species Aleochara laticollis Stephens, 1832, by original designation), syn. nov.

Dimetrotina: Smetana, 2004b: 380 (as junior synonym of the Atheta subgenus Dimetrota).

Mycetota: Smetana, 2004b: 389 (as valid subgenus of the genus Atheta).

Dimetrotina: Schülke & Smetana, 2015: 529 (as junior synonym of the Atheta subgenus Dimetrota).

Mycetota: Schülke & Smetana, 2015: 545 (as valid subgenus of the genus Atheta).

(other references are omitted)

The type species of Dimetrotina, Dimetrota vaniuscula, is a junior synonym of Atheta pasadenae, a species very similar to the type species of Mycetota ( Aleochara laticollis). See above for a list of characters shared by the two species. Due to similarity of the two type species, the name Mycetota is placed in synonymy with Dimetrotina . This results in the following new subgeneric combinations in the genus Atheta:

Atheta (Dimetrotina) laticollis (Stephens, 1832), new subgeneric assignment Atheta (Dimetrotina) mucronata (Kraatz, 1859), new subgeneric assignment Atheta (Dimetrotina) pasadenae Bernhauer, 1906, new subgeneric assignment