It belongs to the Siphonella genus group (Kanmiya 1983), with the following characters: head much wider than long; face concave, with a linear median carina; gena narrow; frons speckled, thickly clothed with short setulae, and sparsely microtomentose universally or in reticular-form; scutum as long as wide, convex, minutely or weakly shagreened, glossy or entirely microtomentose in both sexes; male surstylus highly specialized, incrassate
and semi-globose, larger than epandrium in lateral view; gonites not well demarcated; hypandrium closed (Sabrosky 1980; Kanmiya 1983; Merz 2008).
They are sit-and-wait predators that catch bypassing prey with their strongly incrassate
, raptorial forelegs.
Apertural lip expanded and flaring, not strongly incrassate
Head: wider than long, the anterior process short with small clypeus; gena reduced, not exceeding apex of clypeus; antenniferous tubercles blunt; eyes large, semiglobose; postocular margins broadly rounded without tubercles or spine, not exceeding outer margins of eyes, converging on constricted neck; antenna long and stout, first and fourth segments subequal in length, second shortest, third longest, first incrassate
, second, third and fourth clavate, fourth with pilose apex (Fig.
7 1900 4460 (C) lucerne (D) and annual medics (E)) (A) Setaria incrassate
abudi: the chela manus of the adult male is incrassate
and the fingers strongly curved proximally (fixed finger curved dorsally, movable finger curved ventrally), such that only the distal portion of the fingers connect and a distinctive gap is present between them proximally, when closed (Fig.
Dampened by incrassate
frost until the arrival of dawn.
Apertural lip expanded and flaring, reflected and incrassate
23 times as long as the transocular width, thicker than others, gradually thickening distad, basis stalked; II-IV flagelliform, II slightly incrassate
distad, IV apically pointed, subarcuate.
Pedipalpal tibia, size in relation to the femur, (0) incrassate
, comparable size; (1) not incrassate
, much smaller.
Transverse, narrower than pronotum, eyes moderate in size, about as long as tempora; infraorbital carina well developed, complete; neck absent; antennomere 4 subquadrate, 5-10 transverse, slightly incrassate
5 (but less than 4) times that of the second segment; the mesosternum less than twice length of metasternum, and the short, conate parameres, whereas the sister group relationship between Gerris and Aquarius is diagnosed by the basis of the first antennal segment being shorter than half the body length; the absence of a pale median stripe on the pronotal lobe, the thickened fore femora of the female, and the incrassate
fore femora of the male (Damgaard and Cognato, 2005).