Homeoura lindneri ( Ris, 1928 )

Lozano, Federico, Muzón, Javier & Torres, Sabrina, 2009, Description of the final instar larva of Homeoura lindneri (Ris, 1928) and redescription of the larva of H. chelifera (Selys, 1876) (Odonata: Coenagrionidae), Zootaxa 2231, pp. 47-54 : 48-49

Homeoura lindneri ( Ris, 1928)

Acanthagrion lindneri Ris, 1928: 41 –44, figs. 1–2 (description of male and female). Homeoura lindneri : von Ellenrieder, 2008: 96 –97 (complete synonymy).

Description of final instar larva (figs. 1–2). Head. Almost 2.15 times as wide as long at its widest point. Posterolateral margins rounded, with more than 20 spinules. Antennae seven-segmented; third antennomere the longest. Mandibular formula (figs. 1c–d): L 1+2 3 4 5 y a b (1<3<2<4<5) / R 1+2 3 4 5 y a (1<3<2<4<5). Labium: articulation of pre- and postmentum between bases of coxae I; prementum (fig. 1a) sub-triangular, ratio of maximum length to maximum width 1.27; anterior margin convex and slightly crenulated; with 7–8 premental setae (3+3, 4+3 or 5+3), the inner ones smaller than 0.5 the length of the external ones; lateral margin with 3–5 spines; latero-distal margin with 2 or 4 spines. Labial palp (fig. 1b): outer margin with 3–4 setae; distal margin with 8–9 teeth (decreasing in size laterally); movable hook longer than half the length of outer margin.

Thorax. Wing pads reaching mid length SIV; femora without spines on flexor margin; femora I-II with short spines along the entire extensor margin; femur III with short spines restricted to distal third of extensor margin. Tibiae with short spines restricted to distal third of flexor margin (increasing in number towards tibia III); without spines along extensor margin.

Abdomen. Cylindrical. SI–VIII with spinules along lateral carina; posterior margins of SV–X with a row of spines. Cerci sub-conical, smaller than 0.5 the length of SX. Female gonapophyses (fig. 2c–d) reaching distal end of SX, outer ones with a ventral row of denticles. Lateral caudal lamellae (fig. 2a) lanceolate (almost 0.8 the length of the abdomen); ratio of maximum length to maximum width 8.31; nodus at approximately 0.58 the length of the lamella; with transverse suture (visible on ventral half of the lamella), 14–18 dorsal spines, and 27–36 ventral spines; prenodal area with a rounded dark spot near base of lamella, and scattered groups of dark branching tracheoles, most strongly colored at margins; postnodal area with three transverse black stripes (the proximal do not reach the dorsal margin). Medial caudal lamella (fig. 2b) lanceolate (almost 0.72 the length of the abdomen); ratio of maximum length to maximum width 8.27; nodus at approximately 0.56 the length of the lamella; with transverse suture, 24–26 dorsal spines and 14–16 ventral spines; color pattern similar to that of lateral caudal lamellae.

Measurements (in mm; average, range in square brackets; females N=3, unless indicated otherwise). Total length (without caudal lamella): 12.23 [12.10–12.50]. Head: maximum length (N=2): 1.30; maximum width (N=2): 2.80. Prementum: maximum length: 1.87 [1.80–1.90]; maximum width: 1.47 [1.40–1.60]; outer premental seta (N=1): 0.35. Thorax: femur I: 1.67 [1.60–1.70]; femur II: 2.33 [2.30–2.40]; femur III: 2.93 [2.80–3.00]; tibia I: 2.00 [1.80–2.20]; tibia II: 2.50 [2.40–2.60]; tibia III: 3.10 [3.00–3.20]; inner wing pads maximum length: 3.73 [3.60–3.80]; outer wing pads maximum length: 3.60 [3.40–3.70]. Abdomen: total length: 7.53 [7.20–8.00]; SIX length: 0.70; SX length: 0.50; cerci length: 0.10; female gonapophyses length: 1.03 [1.00–1.10]. Lateral caudal lamella: maximum length: 6.07 [6.00–6.20]; maximum width: 0.73 [0.70– 0.80]; dorsal row of spines length: 3.03 [2.80–3.20]; ventral row of spines length: 3.57 [3.30–3.70]. Medial caudal lamella: maximum length: 6.20; maximum width (N=2): 0.75 [0.70–0.80]; dorsal row of spines length: 3.07 [2.50–3.40]; ventral row of spines length: 2.63 [1.90–3.10].

Specimens examined. Homeoura lindneri : Argentina, Entre Ríos Province, Diamante Department, Pre- Delta National Park, 32° 07’ 57’’S, 60° 40’ 32’’W; 23–24/XI/2006, coll. A. Garré, J. Lambruschini, F. Lozano, L. Ramos & S. Weigel Muñoz, 3 female exuviae (reared) [emerged: 28/XI/2006, 30/XI/2006, 06/XII/ 2006].