Argia mollis Hagen in Selys, 1865

Cezário, Rodrigo Roucourt, Vilela, Diogo Silva & Guillermo-Ferreira, Rhainer, 2018, Final instar larvae of Argia mollis Hagen in Selys, 1865 and Argia smithiana Calvert, 1909 (Odonata: Coenagrionidae) from the Brazilian Cerrado, Zootaxa 4514 (1), pp. 137-144 : 138-140

publication ID 10.11646/zootaxa.4514.1.11

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Argia mollis Hagen in Selys, 1865


Description of the final instar larvae of Argia mollis Hagen in Selys, 1865 View in CoL

Figs. 1–6 View FIGURES 1–4 View FIGURE 5 View FIGURE 6 .

Material examined. 1 ♂ F0 exuvia ( Fig. 1a View FIGURES 1–4 ): BRAZIL, Chapada dos Guimarães, Riacho 1 Ponte (15°31’93.06” S, 55°95’23.89” W), 21-x-2015, Guillermo-Ferreira leg. , 1♂ (reared in laboratory).

Head. Almost rectangular, wider than longer, cephalic lobes large and bulging, bearing small setae. Posterior border widely concave ( Fig. 1b View FIGURES 1–4 ). Medial margin of compound eyes slightly straight. Ventral margin of the eyes at mandibles level. Antennae 7-jointed, longer than the head, third antennomere being the longest, antennomere 1 brownish, yellowish to pale on 4–7; length of antennomeres: 0.10, 0.37, 0.53, 0.41, 0.26, 0.15, 0.07 ( Fig. 2 View FIGURES 1–4 ). Prementum ( Fig. 3 View FIGURES 1–4 ) about 0.74 as wide as long, bare dorsal surface, distal margin moderately prominent, its apical margin finely serrulated ( Fig. 3a View FIGURES 1–4 ); labial palp with two teeth, both smaller than movable hook, the medial (outer) the longest; outer margin of the hook finely crenulated ( Fig. 3b View FIGURES 1–4 ); 1 short palpal setae on the base of movable hook ( Fig. 3b View FIGURES 1–4 ). Mandibles present molar teeth but no molar crest, with the following formula: L 1+2345 0 a b (1>3>2>4>5), R 1+2345 0 a (1>3>2>4>5) ( Fig. 4 View FIGURES 1–4 ). Pronotum dark brown, quadrangular, bearing small setae. Wing pads brown, extending up to segment 4. Legs light brown with two dark lateral spots on femora and tibiae ( Fig. 1a View FIGURES 1–4 ). Abdomen. Larvae dark brown, with pale dorsolateral spots on S1–3, and darker markings on S4–8 basal ring ( Fig. 1a View FIGURES 1–4 ). Male cerci ( Fig. 5 View FIGURE 5 a–b) enlarged, with small excavations in mediodorsal view ( Fig. 5a View FIGURE 5 ); in lateral view roundly pointed, small concave dorsal excavation, pointed forwards ( Fig. 5b View FIGURE 5 ). Male gonapophysis pyramidal blunt, dark; surpassing 30% of S10 ( Fig. 5 View FIGURE 5 c–d). Caudal lamellae (Attention: some portions of both lamellae are folded on itself and highlighted with red arrows. The descriptions represent the structures without the folds) laminar, oblong, narrow foliated at the base, foliaceous at the middle; both lateral and median lamellae with ochre coloration; both median and lateral lamella with irregular pale spots on the mid portion; median lamella shorter than lateral lamellae ( Fig. 6 View FIGURE 6 a–b).

Measurements (n = 1). Total length without appendages: 11.99. Total length of head: 1.55; max. width: 3.28. Prementum length: 2.90; max. width: 2.16. Total length of labial palp: 1.58; max. width: 0.36. Femur I: 2.05; II: 2.64; III: 3.74. Tibiae I: 2.37; II: 2.79; III: 3.37. Inner wing pads: 4.45; external wing pads: 4.23. Medial caudal lamellae: 4.35; lateral caudal lamellae: 4.57.

Habitats: The larvae of A. mollis was collected in a small order rocky stream, among the roots of a small patch of aquatic vegetation.

Differential diagnosis. Provided under diagnosis of A. smithiana below.













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