Angelagrion Lencioni 2008, gen. nov.
Creators: name: Lencioni, Frederico A. A.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Angelagrion

description: Angelagrion gen. nov.   
Figures 1–9  
 Type species: Angelagrion fredericoi sp. nov. by present designation.   
 Etymology: Named Angela after my beloved wife Angela Schmidt Lourenço Rodrigues – and agrion, neuter form of agrios meaning "wild", which in damselflies is now used as an indicator that a genus belongs to the Coenagrionidae (Fliedner 2006).   
 Generic characterization. Head. Frons angulated in profile; pale postocular spots present; most posterior point of head at compound eyes (Figs. 1a – 3a).   
 Thorax. Posterior lobe of prothorax approximately rectangular and slightly trilobed, and mesostigmal plates triangular in both sexes (Figs. 5a–c); hind margin of interlaminal sinus prominent, meeting mid-dorsal carina at an obtuse angle; mid-dorsal carina narrowed before interlaminal sinus. Wings petiolated at or slightly before CuP (Figs. 4a–b); CuP reaching CuP&AA or posterior margin of wing; CuA extending for 3–7 cells posterior to vein descending from subnodus; 3–4 cells between quadrangle and vein descending from subnodus in Fw; RP 2 in Fw beginning slightly beyond Px 4–5 and in Hw at Px 4; pt costal side 3 times longer than distal side (Figs. 4a–b), distal and proximal sides of pt subequal. Spurs on distal half of metafemur shorter than width of femur; metatibial spurs shorter than intervening spaces.   
 Abdomen. In both sexes mostly blue with black markings; S2–5 or S2–6 with a black mid-dorsal stripe terminating in an angulated expansion joined or not with the black apical annulus, which is expanded basally at varying degrees; S8–10 dark brown to black; sternum of S 8 in males with a circular bluish-white spot (unique for genus). Male cercus dark, in lateral view much shorter than S10, approximately rounded; male paraproct entire, in lateral view about twice the length of cercus (Fig. 6a). Female S8 lacking vulvar spine; female cercus much shorter than S10; tergum of S10 with a very short dorso-posterior cleft. Ovipositor robust and long, with a single row of teeth along ventral margin of outer valves, and tip (excluding stylus) extending to tip of cerci (Figs. 6d–e). Posterior margin of S9 of female without denticles (Figs. 6d–e).   
Male genital ligula with portion of distal segment distal to flexure gradually narrowing to a narrow, slightly spatulate apex about as wide as 0.25 of portion proximal to flexure; ental surface of distal segment with small sclerotized spines arranged in three groups; inner fold prominent, broad at base, as long as 0.70 of portion distal to flexure, and as wide as portion proximal to flexure; terminal fold present but small, its medial portion notched (Figs. 7a–e). Larva unknown.  
 Diagnosis. Angelagrion possesses the following combination of characters which separate both species from all other described Coenagrionidae: S8–10 varying from dark brown to black in both sexes contrasting with mostly pale blue remainder of abdomen, circular bluish-white spot on sternum of S8 of males and internal fold of genital ligula modified as a bellows which opens when distal segment is extended (Figs. 7b, d), and a short CuA (shared with Aceratobasis mourei (Santos), Calvertagrion St. Quentin, Chrysobasis Rácenis, Dolonagrion Garrison & von Ellenrieder, some Homeoura Kennedy, Leptobasis, Mesoleptobasis Calvert, and Telagrion Selys).
description: Published as part of Lencioni, Frederico A. A., 2008, Angelagrion gen. nov. with description of A. nathaliae sp. nov. and A. fredericoi sp. nov. from Brazil (Odonata: Coenagrionidae), pp. 23-32 in Zootaxa 1968 on page 24