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remigis group

Water Strider - Aquarius remigis Water Strider IMG_0582 - Aquarius remigis Aquariua sp. - Aquarius remigis - male - female 7008182 Gerrie - Aquarius Water Strider - Aquarius remigis Aquarius remigis? - Aquarius remigis Male, Aquarius sp. - Aquarius - male Gerridae - Aquarius remigis - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Gerromorpha (Semiaquatic Bugs)
Superfamily Gerroidea
Family Gerridae (Water Striders)
Subfamily Gerrinae
Genus Aquarius
No Taxon remigis group
Synonyms and other taxonomic changes
Taxonomy needs further study
Range
Much of North America (Canada to Honduras); rare to absent from the southeastern coastal plain and Arctic/boreal regions
Remarks
As of 2020, genetic and morphological studies place the A. remigis group either within or sister to the Gerris clade, not with the rest of Aquarius species(1)(2)(3). The A. remigis group likely represents an unnamed genus that is sister to a monotypic genus containing A. chilensis(4)
The group consists of three valid species, with a fourth currently treated as a synonym of A. remigis. Only A. remigoides was described to meet modern taxonomic standards(5)(Damgaard and Christiansen 2007). With the possible exception of A. amplus, species within the group cannot be separated using external characteristics.
A. amplus: southern AZ & Mexico; connexival spines shorter than in A. remigis
A. nyctalis: treated as a synonym of A. remigis based on genital morphology; described as a high altitude lake dweller of the Rockies and other mountainous areas of western North America
A. remigis: reported from all the contiguous US states, much of Canada, and Mexico; its distribution in the Southeast US and Appalachians to PA needs further assessment
A. remigoides: reported from central PA to GA along the Appalachians; described based on morphology supported by genetic & behavioral analyses(5)(6)