Heteragrion atrolineatum Donnelly, 1992

Ramírez, Alonso & Gutiérrez-Fonseca, Pablo E., 2013, The larvae of Heteragrion majus Selys and H. atrolineatum Donnelly, with a key to known species from Costa Rica (Odonata: Megapodagrionidae), Zootaxa 3609 (1), pp. 96-100 : 99

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Heteragrion atrolineatum Donnelly, 1992


Heteragrion atrolineatum Donnelly, 1992

Figs. 2b, 3b View FIGURES 2–5

Material. 1♂ exuvia (reared). COSTA RICA: Limón province, Guápiles, Dos Novillos stream, Don Eladio (410 m), 10°12’46 N, 83°35’ 29 W GoogleMaps . 16-IV-2006. P. Gutiérrez leg.

Description. Larvae uniformly light brown, body robust with cylindrical abdomen, integument densely covered with small setae, as in H. majus .

Head. As in H. majus , but with following differences: Cephalic lobes with short setae. Antennae 7-segmented, 3 rd segment longest, relative length of antennomeres: 0.7, 0.7, 1, 0.8, 0.4, 0.3, 0.2. Antennomeres 3-7 without rings of fine setae ( Fig. 2b View FIGURES 2–5 ). Mandibles as in H. majus , but L 1 1' 2 3 4 0 a(m 1,2,3,4,5)b. Prementum longer than wide (2 x 3 mm). Labial palp with few short setae on external margin; middle one of 3 apical teeth longest. Ligula with median incision U-shaped ( Fig 3b View FIGURES 2–5 ).

Abdomen. As in H. majus , but posterior margin of abdominal S6–8 with row of strong setae in dorsal view; S9–10 with row of spines. Ventrally, S9–10 with incomplete row of spines in ventral view, more evident toward margins. Gills as in H. majus .

Measurements (in mm): Total length without gills: 13 (larvae); posterior femur 4.0; posterior tibia 3.5; maximum width of head 3.0; lateral gills 5 without filament (7 with filament), middle gill 4 without filament (6 with filament).

Remarks. Larvae of both species were found among accumulations of detritus on the stream bottom, under rocks or where leaf litter accumulated. Streams were 1–2 m wide and had abundant cobbles and continuous water flow, surrounded by forest.