Synonyms and other taxonomic changes
formerly treated as a subgenus of Gerris
Explanation of Names
Aquarius Schellenberg 1800
hind tibia at least 4 times as long as metatarsomere 1; connexival spines prominent; pronotum dull; antennomere 1 more than 0.9 as long as antennomeres 2+3; adults winged or wingless
worldwide, but mostly holarctic; throughout NA(2)
surface of ponds, lakes, slow-moving streams, rivers
Taxonomy of the Aquarius remigis group is in need of further study. As of 2020, genetic and morphological studies place the A. remigis group either within or sister to the Gerris clade, not with other all other Aquarius species (Damgaard and Cognato 2006; Damgaard and Christiansen 2007; Ye et al. 2017). The A. remigis group consists of three valid species, with a fourth currently a synonym of A. remigis. Only the relatively recently described A. remigoides was sufficiently described to meet modern taxonomic standards (Gallant and Fairbairn 1996; Damgaard and Christiansen 2007). With the possible exception of A. amplus, species within the group cannot be separated using external characteristics.
A. amplus: found in southern AZ and Mexico; has connexival spines shorter than A. remigis
A. nyctalis: currently a synonym of A. remigis based on genital morphology; this species was described as a high altitude lake dweller of the Rockies and other mountainous areas of the western US and Canada
A. remigis: reported as occurring throughout all contiguous 48 states, much of Canada, and into Mexico; its distribution in the Southeast US and Appalachians to PA needs further assessment
A. remigoides: reported as occurring from central PA south throughout the Appalachians to GA; described as a unique species based on morphological characters and supported by genetic and behavioral analyses (Gallant and Fairbairn 1996, 1997)
The only other Aquarius species in North America are A. conformis and A. nebularis, which are placed with other Aquarius species and are themselves closely related sister species within the A. elongatus group.
Gerris: connexival spines not prominent, metatibia <3.3 as long as metatarsomere 1
Limnoporus: antennomere 1 <0.8 length of antennomeres 2+3