Oreiallagma oreas Ris 1918, comb. nov.
Creators: name: Ellenrieder, Natalia Von
name: Garrison, Rosser W.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Oreiallagma
Oreiallagma oreas

description: Oreiallagma oreas (Ris 1918) comb. nov.
Figures 26; 52; 89; 94; 104
Telagrion oreas Ris 1918: 136, 138–139, fig. 78 (diagnosis from T. quadricolor, description of male, illustration of S10). Kimmins 1945: 189 (comparison with T. prothoracicum). St. Quentin 1960: 48 (key for males).
Santos 1965: 9 (possible placement in Leptagrion). Davies & Tobin 1984: 94 (synonymic list).
Garrison 1991: 13 (synonymic list).
Bridges 1994: VII.174 (synonymic list).
Steinmann 1997: 358 (synonymic list).
Tsuda 2000: 50 (synonymic list).
Lencioni 2004: 92 (mention).
Types: ɗ holotype in FNS (examined) with following data: "Monte Socorro 2300 m / [Valle del Cauca Dept.] Colombia, W. Cordill./ vii. 0 9 [A.H.] Fassl"; (Senckenberg Register No. 10764).
Characterization. Medial lobe of posterior lobe of prothorax is slightly constricted at base, subquadrate, with shallow medial concavity on posterior margin (Fig. 26; as in O. acutum and O. quadricolor). Distal segment of genital ligula (Fig. 52) approximately as wide at apex as at base with two contiguous pairs of lateroapical lobes (unique) recurved and directed basally, small accessory latero-medial lobes and one (as in O. prothoracicum) ental membranous faint transverse fold (Fig. 52 c). Dorsal process of male cercus much shorter than ventral process, represented by a blunt setose tubercle (Figs. 89; 94; unique). Dorsum of S1 dark brown, posteriorly with a transverse oval greenish blue spot; of S2 orange becoming diffuse brown anteriorly; of S3– 5 pale orange-red; of S6 orange antero-laterally, black dorso-posteriorly; of S7 black with a narrow reddish lateral margin over the anterior three fourths; of S8–9 blue, laterally reddish, both colors separated through a black longitudinal stripe; of S10 black. Female unknown.
Diagnosis. This species, known only from the mature holotype male, is unique in that the dorsal process of the cercus is represented by a blunt setose tubercle (Figs. 89; 94). In all other species the dorsal process is either long and digit-like (O. acutum, Figs. 85; 90; O. thelkterion, Figs. 86; 91) or acute if small (O. prothoracicum, Figs. 87; 92; O. quadricolor, Figs. 88 a; 93). The distal segment of the genital ligula (Fig. 52 a) is uniquely armed with a pair of small contiguous latero-apical lobes (a single long latero-apical recurved lobe in O. thelkterion, Fig. 49 b; O. quadricolor, Fig. 50 b; and O. acutum, Fig. 51 b; and a single small latero-apical lobe in O. prothoracicum, Fig. 53 b).
Biology. Unknown; see remarks under generic account.
Distribution. Colombia (Valle del Cauca Department) at 2300 m above sea level (Fig. 104). Following information about this locality is provided by Ris (1918): "......Santa Margarita ('situated deep in the high mountain forest at 2200 m is the last house Santa Margarita, on upper bank of Rio Cali, the estate of a Colombian general'); out from here the gold mine Monte Socorro is reachable with effort."
description: Published as part of Ellenrieder, Natalia Von & Garrison, Rosser W., 2008, Oreiallagma gen. nov. with a redefinition of Cyanallagma Kennedy 1920 and Mesamphiagrion Kennedy 1920, and the description of M. dunklei sp. nov. and M. ecuatoriale sp. nov. from Ecuador (Odonata: Coenagrionidae), pp. 1-51 in Zootaxa 1805 on pages 45-46, DOI: 10.5281/zenodo.182666