Ephydra

Mathis, Wayne N. & Sepúlveda, Luciane Marinoni and Tatiana A., 2025, Phylogeny and taxonomy of the shore-fly tribe Ephydrini with comments on related tribes in Ephydrinae (Diptera: Ephydridae), Zoologia (e 24044) 42, pp. 1-42 : 19

Key to subgenera and species groups of Ephydra

1. Cruciate interfrontal setae weak or lacking; crossvein dm-m forming an acute angle with vein M 1; palpus small; coloration of mesonotum strongly whitish gray (subgenus Halephydra Wirth ) .......... E. gracilis Packard

1’. One pair of well-developed, cruciate, interfrontal setae; crossvein dm-m forming nearly right angle with vein M 1; palpus well developed; coloration of mesonotum shiny to moderately grayish (subgenus Ephydra Fallén ).............................................................................. 2

2. Anterior acrostichal setae in 2 distinct rows; coloration generally grayish, microtomentose; tarsal claws generally nearly as long as tarsomere 5; male aedeagus nearly straight, lacking recurved, basal process..... ..................................................................... glauca Group

2’. Anterior acrostichal setae unseriated or in 4–5 irregular rows; coloration generally olive green, microtomentose; tarsal claws generally not more than half as long as tarsomere 5; male aedeagus with strongly recurved basal process............................. riparia Group