Leptobasis yanomami,

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: 62-63

publication ID

http://doi.org/ 10.5281/zenodo.3266063



persistent identifier


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scientific name

Leptobasis yanomami


Leptobasis yanomami  sp.n.

Figures 31-35View Plate V

Male (holotype). Venezuela, Amazonas Federal Territory, upper Rio Mavaca, 160 m, 02°02'10"N. 65°06'50"W, 14 Feb - 6 Mar 1989, J. DeMarmels legGoogleMaps  .

Material. 2♂, 1♀, including holotype and paratypes; all with same dataGoogleMaps  .

Male (holotype). Labium pale; labrum dark green; top of head black, a small rounded blue postocular spot on each side; a rufous transverse band across head between postocular spots and rear of head, which is pale. Antennae dark brown. Compound eyes in life dark green above, vivid grass green below. Anterior lobe of pronotum ru· fous laterally, blue dorsally in the middle; me· dian lobe rufous above, bright blue laterally; pos' terior lobe brown, its hind margin trilobate with the middle lobe about as broad as both lateral lo­ bes taken together. Each mesepisternum with a rounded tubercle behind mesostigmal laminae, close to median carina. Color of pterothorax stron­ gly rufous with vivid blue stripes as follows: a complete antehumeral stripe closely paralleling humeral suture, a somewhat broader stripe over proximal half of metepisternum and lower angle of mesinfraepisternum, an ill-defined stripe along distal margin of metepimeron; the latter otherwi­ se creamy to bluish white. Legs pale, dark brown tibial spines shorter than intervening spaces. Wings hyaline, venation dark brown; pterostig­ rna rufous, shorter than underlying cell and with the four sides about equal in length. Anal vein branching from wing margin as far after cux as this latter is long. Three antenodal cells in the discoidal field (two in right fore wing) 11 px in fore wings, 10 in hind wings. R3 rising from or af­ ter fifth px; IR2 from eighth or ninth px in fore wings. In hind wings R3 branching after the fourth px; IR2 as in fore wings. Abdomen chiefly brown dorsally, darker at tips of segments 3-6. Segments 1.3 laterally blue, segments 7-10 entirely rufous and laterally slightly expanded. Anal appendages rufous, shaped as in Figs. 31 and 32View Plate V.

Measurements. Total length (incl. appendages) 36.5: abdomen 30.5; hind wing 17.5.

The male paratype resembles the holotype, but has 12 px in the fore wings. RJ rises from the sixth px in the fore wings, from the fifth in the hind wings. Penis as illustrated in Figs. 33 and 34View Plate V.

Female (paratype). Top of head and labrum ru­ fous, otherwise as male. Hind lobe of pronotum trilobate, but considerably different from male ( Fig. 35View Plate V). Wings similar to male paratype. Eighth abdominal segment with ventral spine; oviposi­ tor slightly surpassing end of segment 10.

Measurements. Total length 38.0; abdomen 31.5; hind wing 19.0.

Remarks. Leptobasis yanomami  comes closest to L. mammilaris Calvert, but differs from it in the shape of the male anal appendages and the female prothoracic hind lobe. The latter is illustrated for L. mammilaris in Fig. 36View Plate V. The female attributed to L. mammilaris by Calvert (1909) is doubtless not that species. All specimens were taken in the forest on sun-hit bushes, away from water. The specific name chosen refers to the Indian tribe of the "Yanomami" which settles in this South Venezuelan region.