Anteromedian longitudinal sulcus, interocular sulcus; posteromedian
longitudinal and posterolateral sulci present and conspicuous, but not very deep.
The posterior margin of the nuchal plate is slightly embayed and has a single posteromedian
process (Figs 2B, 6A).
Lingual propulsive pressures across consistencies generated by the anteromedian and posteromedian
tongue by healthy young adults.
The only Patagonian species of Stilobezzia (Acanthohelea) in which males have the gonostylus abruptly curved and the gonocoxite has a conspicuous protuberance on proximal inner margin; females have two large, greatly elongated flask-shaped spermathecae and sternite 8 with a U-shaped posteromedian
Fore femur with three strongly developed posterodorsal setae, median seta being considerably stronger than supramedian and posteromedian
setae; three preapical dorsal setae, two median dorsal setae, 10 posteroventral setae evenly spaced on femur, no differentiated posterior setae.
Surface of mesoscutum distinctly shagreened peripherally, smooth and polished posteromedially; punctatorugose except the small shiny posteromedian
area, here punctures separated by 1 to 2 puncture diameters.
Anal segment of males tectiform and with a wide triangular posteromedian
excavation, posterior margin set with numerous incurving teeth ventrally and occasionally the posteroventral angle expanded.
Lateral margins of pronotum sinuate, lateral margins of head less strongly converging apically, scutellum longer, about 1.42-1.53 x as long as broad, lateral lobes of pygophore in ventral view very slightly projected posteriad, apices conical, ventroposterior margin medially V-shaped, posteromedian
lobes on either side dorsally prominent, also clearly visible in lateral aspect....E.
8O): Median notch less deep with seven pairs of plumose setae and one posteromedian
The unworn anterior loop is highly complex in that the summit is formed "by a large irregular posteromedian
tubercular eminence from which a number of furrows or little valleys radiate, descending obliquely to the outer, anterior, and inner borders of the loop.
The anterior, lateral and posterior margins of syntergite I-III, the fusion lines between mediotergites I-II and II-III, the posterior and lateral margins of mediotergites IV-VI, the lateral margins of mediotergite VII, the posteromedian
angles of epipleurites II-VI, and the posterior margins of all visible abdominal sternites are conspicuously elevated, and ornamented with setigerous tubercles.
Only species of Stilobezzia (Acanthohelea) from Patagonia with the male sternite 9 bearing an elongate and narrow posteromedian