Face and vertex dull silver pruinose, frons red-gold pruinose, mystax black, ocellar
3 times broader than long; inner orbits of compound eyes subparallel; malar area about as long as median ocellar
diameter; clypeus about 3.
Here we will describe these ocellar
structures in detail for the first time and additionally present new TEM observations from Pomatostegus stellatus.
Face, frons and vertex silver pruinose, mystax redbrown, ocellar
macrosetae not evident.
triangle short, with a triangular shape not reaching lunule (Fig.
Frons concave and tapering towards the ocellar
plate; anterior margin not concave nor projected between antennal bases (Fig.
36 X head width; 5-6 frontal setae; reclinate orbital setae strong; proclinate fronto orbital setae small and weak; inner vertical setae strong and reclinate, outer vertical setae absent; ocellar
triangle black, with one pair of proclinate ocellar
setae; postocular setae black; genal groove and anterior half of genal dilation with golden microtomentum; posterior half of genal dilation and postgena with gray microtomentum and pale setae, gena with black setae; face black with gray microtomentum; facial ridge black with gray microtomentum, with setae and setulae close to vibrissa; 3-2 subvibrissal setae; antenna reddish, first flagellomere 1.
Frons and ocellar
area shiny, densely and finely punctate; vertex shiny, sparsely, finely punctate.
Abbreviations used in the descriptions are: F, S, T, OD and PD for antennal flagellomere, metasomal sternum and tergum, ocellar
diameter, and puncture diameter, respectively.
Unfortunately, the head of the paratype deposited in the Senckenberg Museum is tilted forward such that the length of the ocellar
setae cannot be measured accurately, in contrast to the Hood holotype and the specimens slide mounted in London.
Scanning motion, ocellar
morphology and orientation mechanisms in the phototaxis of the nematode Mermis nigrescens.
halophila (Duda) ocellar
triangle entirely microtomentose and weakly glossy; scutum largely microtomentose (widespread in Europe; Mongolia) 3'.