Sanganus

Kallenborn, H. G. & Schmolke, F., 2017, Review of the genus Sanganus Distant, 1909 including the description of a new species, S. quadrangularis spec. nov. (Hemiptera, Heteroptera, Tessaratomidae), Spixiana 40, No. 1, pp. 75-88 : 87

Key to Sanganus species

1 Humeral angles of pronotum strongly produced anteriorly, surpassing head; antennae bicoloured; punctures on pronotum, scutellum, and corium dark brown to black; metasternal carina developed only anteriorly or only posteriorly; hemelytral membrane reaching or surpassing distal end of abdomen ( Fig. 1A- B). ............................ 2 – Humeral angles of pronotum weakly produced anteriorly, not surpassing head; antennae fuscous, uniformly coloured; punctures on pronotum, scutellum, and corium concolourous; metasternal carina developed along the entire median length of the sternum, sulcate; hemelytral membrane not reaching the distal end of abdomen ( Fig. 1C). ................................................ ................................. S. quadrangularis spec. nov.

2 Lateral margins of pronotum usually parallel-sided, narrowly fuscous as well as margins of humeral angles ( Fig. 4A); mandibular plates wider and apically broadly rounded ( Fig. 2A); 4 th antennal segment fuscous, apical third yellowish or reddish ( Fig. 3A); punctures on scutellum and pronotum medium-sized ( Figs 4A, 5A); mesosternal evaporatorium small, not reaching posterior margin of mesopleuron ( Fig. 8A); metasternal carina developed only anteriorly, with drop-shaped ridge ( Fig. 7A). Ƌ: distal edge of pygophore with deep median notch ( Fig. 11A); sensory lobe of paramere reduced ( Fig. 12A); sclerotized proximal conjunctival appendages of aedeagus long, distally tapering ( Fig. 13.1A). ♀: laterotergites IX subquadrangular, sutural margins distally deeply emarginate ( Fig. 14A). ........................ S. westwoodii ( Vollenhoven, 1866) – Lateral margins of pronotum usually diverging anteriad, margins not darker than remainder of pronotum ( Fig. 4B); mandibular plates more slender, distally narrowly rounded ( Fig. 2B); 4 th antennal segment yellowish ( Fig. 3B); punctures on scutellum and pronotum more coarse ( Figs 4B, 5B); mesosternal evaporatorium elongate, reaching posterior margin of mesopleuron ( Fig. 8B); metasternal carina developed only posteriorly, not sulcate ( Fig. 7B). Ƌ: distal edge of pygophore gently curved ( Fig. 11B); sensory lobe of paramere distinctly protruding ( Fig. 12B); sclerotized proximal conjunctival appendages of aedeagus short, distally bifid ( Fig. 13.1B). ♀: laterotergites IX rhomboid, sutural margins distally diverging and straight ( Fig. 14B). ........ .......................................... S. jenseni Distant, 1909

Note

The modified key we used to distinguish Pseudopycanum from Sanganus is based on P. nigromarginatum , the only species hitherto known under that genus. Recently, Maurel & Magnien (2016) have described another species they attributed to the genus Pseudopycanum . This species, Pseudopycanum dusoulieri , does not share some of the characteristics we mentioned, in particular the shape of the posterior connexivum.