Mesagrionidae, Bybee & Kalkman & Erickson & Frandsen & Breinholt & Suvorov & Dijkstra & Cordero-Rivera & Skevington & Abbott & Herrera & Lemmon & Lemmon & Ware, 2021

Bybee, Seth M., Kalkman, Vincent J., Erickson, Robert J., Frandsen, Paul B., Breinholt, Jesse W., Suvorov, Anton, Dijkstra, Klaas-Douwe B., Cordero-Rivera, Adolfo, Skevington, Jeffrey H., Abbott, John C., Herrera, Melissa Sanchez, Lemmon, Alan R., Lemmon, Emily Moriarty & Ware, Jessica L., 2021, Phylogeny and classification of Odonata using targeted genomics, Molecular Phylogenetics and Evolution 160, pp. 107115-107115 : 10

Mesagrionidae Kalkman & Sanchez-Herrera fam.n.

(type genus: Mesagrion Selys, 1885 )

The single species of this monotypic family is a medium sized (hindwing 28–32 mm) damselfly restricted to the centraleastern sector of the Colombian Andes were it is found at small waterfalls of forest streams. Wings clear, with two Ax; several intercalated veins distally in radial fields; wings with long petiolation and arculus slightly distal to roughly at two-thirds of distance between wing base and node. Quadrangle without cross-veins; R4 originates at subnode; IR3 originates at level of first postnodal crossvein. Pterostigma, reddish in adult males, with anterior margin about half as long as posterior margin. Adults perch with wings closed. Head black with angulated frons and extensive yellow pattern, thorax black with yellow stripes, legs with long setae, pale yellow but the first pair with red; abdomen largely red becoming dark in adult females. In females large parts of the dorsum of segment 8 are scarcely sclerotized and have distinct yellow colour. Adult male cerci with a simple forcipate shape, paraprocts about as long as cerci and serrated at the distal fourth of the dorsal margin. Genital ligula with setae on shaft which are as long as segment width; apex divided into two sideward projecting lobes; the internal fold on the genital ligula present. Nymph with relatively large head and thorax and short abdomen; saccoid abdominal gills with long terminal filaments, that of the middle gill about twice as long as that of the lateral gills. Included genera: Mesagrion .