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Genus Ladona - Corporals

Blue Corporal - Ladona deplanata White Corporal, closeup of male claspers - Ladona exusta - male Blue Corporal - Ladona deplanata Chalk-fronted Corporal - Ladona julia - male - female Blue Dragonfly - Ladona deplanata Dragonfly, undetermined species - Ladona julia White Corporal - Ladona exusta - female Dragonfly - Ladona julia
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Odonata (Dragonflies and Damselflies)
Suborder Anisoptera (Dragonflies)
Family Libellulidae (Skimmers)
Genus Ladona (Corporals)
Synonyms and other taxonomic changes
Ladona Needham, 1897. Taxonomic notes:
members formerly placed in Libellula
Explanation of Names
Apparently a proper name, an American combination of La-, the(?), plus Don(n)a, Italian, lady. Perhaps named in honor of a person, or Ladona, Pennsylvania? (Based on Internet searches.)

The common name "Corporal" stems from the conspicuous shoulder stripes in females and non-pruinescent males, which to someone apparently resemble the insignia of a corporal in the US military.
University of Puget Sound, Worldwide list of Odonata lists six species worldwide: deplanata, depressa, exusta, fulva, julia, and pontica.
There are apparently three North American species (deplantata, exusta, julia), according to Gloria Mundi Press.
Distinctive stocky body shape and aforementioned shoulder stripes. Almost always perches on the ground or other large flat surfaces.
Breed in permanent ponds; adults frequently seen in forests away from water, perching on leaf litter.
Early; in North Carolina they are the first Libellulid to appear, in late March or early April, usually disappearing by June.
Print References
Artiss T, Schultz TR, Polhemus DA, Simon C.
Molecular phylogenetic analysis of the dragonfly genera Libellula, Ladona, and Plathemis (Odonata: Libellulidae) based on mitochondrial cytochrome oxidase I and 16S rRNA sequence data. Mol Phylogenet Evol. 2001 Mar;18(3):348-61.
Kambhampati and Charlton. Phylogenetic relationship among Libellula, Ladona and Plathemis (Odonata: Libellulidae) based on DNA sequence of mitochondrial 16S rRNA gene. Systematic Entomology, Volume 24 Issue 1 Page 37, January 1999. (On-line Abstract)
Internet References