Acanthagrion apicale Selys, 1876,

DeMarmels, Jurg, 1992, Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela, Acta Biologica Venezuelica 14 (1), pp. 57-78: 62

publication ID 10.5281/zenodo.3266063


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Acanthagrion apicale Selys, 1876


Acanthagrion apicale Selys, 1876 

Figures 25-29View Plate IV (larva)

Material. 3♂ 1♀ (reared, with exuviae), Base Camp.GoogleMaps 

Larva. Occipital lobes bulging, but not angled, beset with spines; occipital border deeply excavated. Labium ( Fig. 25View Plate IV) reaching to beyond first pair of coxae. Antennae seven-jointed ( Fig. 26View Plate IV), Hind border of pronotum with lateral angles pro· duced, but not pointed. Wing sheaths reaching to base of segment 5 ( Fig. 27View Plate IV). Tibiae and tarsi with scattered soft hairs. Adomen dark with a pale longitudinal dorsomedian line; posterior angles of segments 4-8 strongly marked off and beset with spinules; ovipositor slightly surpassing end of segment 10, valves beset with about four lar­ ges spines and a few very smaIl ones, in a single row ( Fig. 28View Plate IV). Lateral and central caudal gills of same length, sharply pointed ( Fig. 29View Plate IV).

Measurements. Total length (excl. gills) 10.5; caudal gills 7.0; hind femur 2.5.

Remarks. The larva of A. apicale  comes closest to that of A. luteum Racenis described by Geijs­ kes (1941) sub " A. ascendens Calvert  ", but speci­ mens were not compared directly. The larva was found in a small stagnant pool in close vicinity of a sandy creek, in the forest. The pool was filled with leaf litter, had a sandy ground and clear wa· ler.. A larva of Fylgia amazonica lychnitina  De. Marmels was found in the same pool (see below).