Genus Phreatogammarus Stebbing
Stebbing, 1899 (sp. type P. fragilis), p. 427. Chilton, 1918, p. 83.

“Near to Gammarus. First joint of mandibular palp not very short. First and second peraeopods shorter than third, fifth the longest. Third uropod long, with two one-jointed cylindrical rami.” (Chilton, 1918.)

N.B.—My reprint copy contains a rubber-stamped correction to this generic definition, the phrase “with second one-jointed cylindrical rami” being corrected as above.