Eosphaerophoria  

The genus Eosphaerophoria is recognized among the syrphines (subfamily Syrphinae, tribe Syrphini) by this combination of characters: 1) nearly vertical apical vein M1; 2) subtriangular scutellum; 3) male narrowly dichoptic; 4) slightly narrowed abdominal base in males; and 5) reduced alula and anal lobe.

Vockeroth (1969) considered this genus the most aberrant of the Syrphini based on the presence of uncommon morphological characters, such as wing venation and dichoptic males, but noting also the asymmetry of the superior lobes of the male genitalia. This character cannot be considered diagnostic because there are species with symmetrical superior lobes too, as pointed out by Vockeroth (1969).