Mesonotum, mesosternum, mesopleurae, metapleurae and metasternum
light brown, with pale white and blackish brown maculations.
45), between metepisterna and metasternum
; and this sclerolepidia raised among the reticulations in the reflexed wall of the metasternal groove, into which fits the ventral margin of the metepisternum (Fig.
This is the first known flightless Trichiorhyssemus species in the world, thus readily recognized by characters related to microptery, like the indistinct humeral callus and the shortened metasternum
. Three species of this genus were formerly quoted from the Western Hemisphere, namely T.
between middle coxae finely, shallowly punctuate near coxal margins ...
Head: wider than long, shorter than maximum length of pronotum; labium reaching middle third of metasternum
; interocellar distance shorter than 0.40; antenniferous tubercle exposed, elongate, diverging anteriorly, armed with anteriorly directed long spine, slightly convoluted, reaching basal third of antennal segment I.
Rostrum reaching metasternum
. Measurements (n = 3).
Mesosternum and metasternum
with sparse and inconspicuous small granules.
median carina on the pronotum, the length of first segment of middle tarsus being more than 2.5 (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).
Setae A2 and M2 on prosternum, A2 on meso- and metasternum