Aeshna cornigera planaltica Calvert, 1952

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 : 64

Aeshna cornigera planaltica Calvert, 1952

Figures 47-48 (larva)

Material. 1♂ (reared from last instar larva). Tamacuari .

Larva. This single specimen is the only one know to me of the pantepuyan form of planaltica. It differs from a typical Brazilian planaltica (♂, ultimate instar exuviae, Rio Grande so SuI, sep 1985) kindly furnished to me by Prof. Dr. A.B.M. Machado, Belo Horizonte, as well as from ordinary North Venezuelan cornigera cornigera described by DeMarmels (1982): In the Tamacuari specimen, the prementum surpasses posteriorly the middle coxae ( Fig. 47 ), while in the Brazilian c;xample it ends already between the middle coxae. The male lamina at the base of the epiproct is close to half as long as the latter, and sharply pointed in the Tamacuari larva ( Fig. 48 ); this la. mina is obviously shorter than half the epiproct and more bluntly tipped in cornigera cornigera .

Measurements (Tamacuari). Total length 34.5; maximum width of head across compound eyes 8.0; hind femur 6.0; hind tibia 6.7.

Remarks. The single larva was found in a small mountain creek in the forest, together with many larvae of Neocordulia biancoi (see below). Unfor. tunately, the adult male escaped after having been kept alive for maturation during two days.

Figures

Plate VI: Figures 47-48. Aeshna c. planaltica, male ultimate instar exuviae, (47) labium, ventral view; (48) anal pyramid, dorsal view. Figures 49-57. Triacanthagyna dentata, female. (49) tipo of abdomen (adult) with anal appendages, left lateral view; (50) same, dorsal view; (51) head (ultimate instar exuviae), dorsal view; (52) labium, ventral view; (53) apical portion of labium with right palp, dorsal view; (54) right prothoracic supracoxal process, dorsal view; (55) part of abdomen showing left lateral spines, dorsal view; (56) anal pyramid, dorsal view; (57) abdominal segment 9 with gonapophyses, ventral view.