Acanthagrion gracile Rambur
Creators: name: Anjos-Santos, Danielle
name: Carriço, César
name: Costa, Janira Martins
name: Santos, Tatiana Chrysostomo
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Acanthagrion
Acanthagrion gracile

description: Acanthagrion gracile (Rambur)
Description of last instar larva (Figs. 1–7). Head. Almost two times as wide as long, posterolateral margins slightly concave, posterior angle with several short spines (Fig. 1). Posterior margin concave. Five or six spines on inferior border of eyes near maxillae. Antennae 7-segmented, the third antennomere the longest. Labium reaching second coxae; prementum subtriangular, almost 1.3 times as long as wide; anterior margin convex and slightly crenulated, with 6 or 7 premental setae (3 or 3+1), the inner one shorter than the others; lateral margin with about 9 spiniform setae (Fig. 2). Labial palp with four setae; outer half of distal margin with three or four very small teeth, inner half with three teeth and a curved end hook; movable hook slender and sharp; inner margin of palp slightly crenulated (Fig. 3). Mandibular formula: L 1+2 3 4 5 0 a b, R 1+2 3 4 5 y a (Figs. 4 a,b).
Thorax. Wing pads nearly parallel, the external ones reaching middle of S4. Legs pale; femora with a row of spiniform setae on the dorsal and lateral surface; tibiae with sparse, long and delicate setae on the external surfaces; tibiae I with delicate setae on the internal surface, tibiae II and III with a row of spiniform setae on the anterior half of the middle internal surface, apical ends of tibiae with a delicate group of setae on the internal surface; tarsi with two rows of setae on the ventral surface.
Abdomen. Cylindrical. Light brown. Dorsal spines on the tergite surface S7–10, thicker on S9–10. A row of lateral spines on S2–10, thicker on S5 –10. Male gonapophyses sharply pointed and divergent, reaching base of S10 (Fig. 5). Female gonapophyses exceeding posterior margin of sternite 10, lateral valvae sharply pointed with a ventral row of 7 robust spiniform setae increasing in size posteriorly (Fig. 6). Male cerci as in Figure 5 and female cerci as in Figure 6. Caudal lamellae lanceolate, with width/length ratio 0.12 (Fig. 7). Dorsal margin of lateral caudal lamella with about 50 setae; ventral margin with about 20 setae. Tracheation as in Figure 7.
Measurements (mm): Total length (without caudal lamella) (N=8): 11.45 [10.47–12.82]. Head: maximum length: 1.43 [1.28–1.56]; maximum width: 2.77 [2.65–2.86]. Prementum: maximum length: 1.97 [1.77–2.23]; maximum width: 1.48 [1.38–1.56]. Thorax: femur I: 1.42 [1.29–1.66]; femur II: 1.88 [1.64–2.07]; femur III: 2.43 [2.24–2.66]; tibia I: 1.70 [1.39–1.89]; tibia II: 2.09 [2.00–2.30]; inner wing pads maximum length: 3.78 [3.65– 3.87]; outer wing pads maximum length: 3.52 [3.32–3.58]. Abdomen: total length: 7.49 [6.83–8.95]; S9 length: 0.53 [0.36–0.69]; S10 length: 0.44 [0.30–0.54]; cerci length: male (N=3): 0.23 [0.22–0.25], female (N=6): 0.14 [0.10–0.19]; female gonapophyses length (N=6): 0.95 [0.90–0.99]; male gonapophyses length (N=3): 0.36 [0.35– 0.37]. Lateral caudal lamella (N=8): maximum length: 6.34 [6.13–7.11].
Specimens examined: 8 exuviae (3 males and 5 females reared). BRAZIL: Espírito Santo State, Estação Biológica de Santa Lúcia, Lagoa Molino, 24.vii.2009, leg. D. Anjos-Santos, C. Carriço, J. M. Costa & T. C. Santos (2 3) [emerged in laboratory: 29.vii. 2009; 02.viii.2009]. Rio de Janeiro State: Nova Iguaçu, Tinguá, Reserva Florestal, 09.iv.1971, leg. N. D. Santos (1 3) [emerged in laboratory, date not determined]; Areal, Fazenda São Joaquim, 10.vii.1969, leg. N. D. Santos & J. P. Machado (2 Ƥ) [emerged in laboratory, date not determined]; Rio de Janeiro: Quinta da Boa Vista, Horto do Museu Nacional, 04.ix.1980, leg. N. D. Santos & H. Mesquita (1 Ƥ) [emerged in laboratory, date not determined]; Tijuca, Açude da Solidão, 02.viii.1967, N. D. Santos (1 Ƥ) [emerged in laboratory, date not determined]; Silva Jardim, Juturnaíba, Rio São João (CEDAE), 17.ix. 1978, leg. N. D. Santos (1 Ƥ) [emerged in laboratory, date not determined].
description: Published as part of Anjos-Santos, Danielle, Carriço, César, Costa, Janira Martins & Santos, Tatiana Chrysostomo, 2011, Description of the final instar larvae of Acanthagrion gracile (Rambur) and Acanthagrion lancea Selys (Odonata: Coenagrionidae), pp. 44-50 in Zootaxa 2832 on page 45, DOI: 10.5281/zenodo.203582