Erythrodiplax atroterminata Ris

Garré, Analía, Muzón, Javier & Ardohain, Diego M., 2008, Description of the final instar larvae of Erythrodiplax atroterminata Ris and E. corallina (Brauer) (Odonata: Libellulidae), Zootaxa 1896, pp. 45-50 : 46

Erythrodiplax atroterminata Ris

Description of the final instar larva ( Figs. 1–7 )

Head. Pale, with diffuse dark pattern on dorsum, setose; 2.4 times as wide as long. Occiput with four pale stripes, posterior margin concave. Mandibular formula ( Figs. 1–2 ): L 1 2 3 4 0 a b / R 1 2 3 4 y a b c. Labium ( Fig. 3–4 ): articulation of pre- and postmentum between second and third coxae; prementum pale, anterior margin slightly crenulated with 18 or 19 setae, ligula obtuse, ratio of maximum width to maximum length 1.8, lateral setae 12. Labial palp with 8 setae; anterior margin slightly crenulated with 10 setae, inner margin without crenulations, with two setae at labial palp articulation.

Thorax. Pale. Wing pads reaching mid-length of abdominal segment VI; femora with two annular dark bands, one subbasal and one subapical.

Abdomen. Brownish, lateral spines on segments VIII and IX brown with a transverse pale stripe at 0.2 from base, ratio of spine length of segments VIII and IX to maximum length of corresponding segments 0.23 / 0.63 (reared specimen) and 0.2 / 0.53 (reared specimen) respectively ( Fig. 5 ). Paraprocts ( Figs. 6–7 ) nearly two times as long as segment X; ratio relative to paraprocts: epiproct 1.48; cerci 0.74. Epiproct wide at base, apex acute. Tips of paraprocts, epiproct, and cerci slightly recurved ventrad.

Measurements (in mm; mean and standard deviation of exuviae in square brackets): Head maximum length: 2 [2.3 + 0.2]; head maximum width: 4 [4.2 + 0.14]; prementum maximum length: 2.6 [2.7 + 0.14]; prementum maximum width: 3.4 [4 + 0.16]; labial palp maximum length: 2 [2.1 + 0.17]; labial palp maximum width: 1.7 [1.63 + 0.12]; movable hook length: 0.5; inner wing pads: 4.4 [4.47 + 0.09]; length of femora III: 3.5 [3.8 + 0.12]; length of tibia III: 4 [3.9 + 0.29]; length of abdominal terga: VI, 1 [1.1 + 0.12]; VII, 0.8 [0.83 + 0.15]; VIII, 0.7 [0.6 + 0.1]; IX, 0.5 [0.5]; X, 0.3 [0.3]; width of abdominal terga: VI, 4.9 [4.7 + 0.44]; VII, 4.7 [4.43 + 0.64]; VIII, 4 [4.1 + 0.5]; IX, 3.2 [3 + 0.2]; X, 1.4 [1.5 + 0.06]; lateral spines on abdominal segment VIII: 0.2 [0.23 + 0.025]; on segment IX: 0.2 [0.2]; cerci: 0.5; paraprocts: 0.7 [0.67 + 0.05]; epiproct: 1 [1].

Figures

FIGURES 1 – 7. Final stage larva of Erythrodiplax atroterminata Ris: 1, left mandible, inner view; 2, right mandible, inner view; 3, prementum, dorsal view; 4, left labial palp, dorsal view; 5, lateral spines on terga VIII – IX, dorsal view; 6, terminalia, lateral view; 7, terminalia, dorsal view. Scales 0.5 mm.