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Genus Ladona - Corporals

Dragonfly - Blue Corporal? - Ladona deplanata dragonfly - Ladona julia - male Chalk-fronted Corporal - Ladona julia - male A blue one - Ladona deplanata - male Chalk-fronted Corporal - Ladona julia - male Blue Corporal - Ladona deplanata - male dragonfly - Ladona deplanata Ladona deplanata / Blue Corporal? - Ladona deplanata
Classification
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.
Numbers
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.
Identification
Distinctive stocky body shape and aforementioned shoulder stripes. Almost always perches on the ground or other large flat surfaces.
Habitat
Breed in permanent ponds; adults frequently seen in forests away from water, perching on leaf litter.
Season
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