Adult Head Morphology
Number of labial palp segments:
from 0 to 3
Labial palpus modification:
Labial palpi often absent, 1-3 segmented in more primitive genera; lateral bristles absent.
present, absent, minute
Number of maxillary palp segments:
from 0 to 3
Number of chaetosomata:
present, absent, reduced
Proboscis usually absent, present in a few of the most primitive genera.
Head vertex scaling:
Number of flagellomere scale rows:
General antennae description:
Antennae 0.3-0.8 the length of forewing; usually vestigial in vermiform female; scape rough, pecten present but often indistinct; flagellum filiform to strongly bipectinate in male, usually filiform in female(when developed) to rarely serrate; vestiture variable, usually with scales scattered over dorsal half, sometimes with one distinct row per segment.
Adult head description:
Vestiture generally rough, consisting usually of moderately long, slender to piliform scales directed mostly forward. Ocelli present in some primitive genera, usually absent. Eyes small to large; interocular index 0.4-2.3; cornea naked. Pilifers and mandibles absent. Maxillary palpi usually absent, rarely rudimentary to 3-segmented (in Kearfottia, Lamyristis).
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