Macrocnemis, Theischinger, G., Gassmann, D. & Richards, S. J., 2015

Theischinger, G., Gassmann, D. & Richards, S. J., 2015, Macrocnemis gracilis, a new genus and species of Idiocnemidinae (Zygoptera: Platycnemididae) from Papua New Guinea, Zootaxa 3990 (3), pp. 429-436 : 430

Macrocnemis gen. nov.

Etymology. The generic name is a composite of macro, meaning large, and cnemis, meaning tibia (= shin), the basis of the name for several genera supposed to be close allies of the new genus.

Diagnostic characters. Very large, long-bodied, narrow-winged damselfly, the male black with pale yellowish green thoracic and largely pale brownish-yellow abdominal markings, including two sets of lateral patches each on segments 3–7. Antennae in both sexes with relative length of first and second joints about 1:2. Posterior lobe of male pronotum upright, more or less rectangular with the top corners drawn out into tongue-like lobes. Female prothorax simple, posterior lobe laterally protruded. Ac located approximately mid-way between levels of Ax1 and Ax2. Quadrilateral widening distally, that of Fw with basal side approximately 1/2 as long as costal and distal side and 1/3 as long as posterior side, that of Hw with basal side 1/4–1/3 as long as costal side, approximately 2/3 as long as distal side and 1/5 as long as posterior side. Three cells between distal end of quadrilateral and level of subnodus. R4 arising a little before subnodus, IR3 at subnodus. Majority of cells in distal half of wings (between R2 and R4) squarish. Distal margin of wings weakly crenulated. Abdomen with S9 and S10 not significantly widened; markings largely pale brownish yellow and including two sets of lateral patches each on segments 3–7. Male with cerci almost as long as, and stouter than, the simple slender paraprocts. Ligula simple, with a pair of medium-sized apical lobes. Ovipositor valvae reaching slightly beyond end of abdomen, not surpassing cerci.