Genus Aivalykus Nixon, 1938

Aivalykus Nixon, 1938: 152 .

Ecphyloides Marsh, 1993: 14 (type species Ecphyloides flavus Marsh, 1993).

Type species: Aivalykus eclectes Nixon, 1938 .

Diagnosis. Head subcubical or weakly transverse (dorsal view); ocellar triangle with base larger than its sides; frons more or less flat and without median keel; eyes always glabrous; occipital carina present and not fused below with hypostomal carina; postgenal bridge narrow; maxillary palps 5-segmented; labial palps 3-segmented; scape wide and rather short without apical lobe; vertex often transversely striate, rarely smooth or very finely aciculate; anterior surface of mesonotum subvertical, distinctly elevated above pronotum; notauli more or less distinct anteriorly, shallow or rarely absent in posterior half; sternaulus shallow, long and straight; prepectal carina distinct and complete; propodeum with or without areas delineated by carinae; lateral tubercles and propodeal bridge absent; fore tibia with small spines arranged in almost single row; hind coxa small, without basoventral tooth-like projection and corner; all femora without distinct dorsal protuberances; fore wing radial (marginal) cell not or only slightly shortened; fore wing without second radiomedial vein (r-m); recurrent vein (m-cu) antefurcal or postfurcal; nervulus (cu-a) always present, short, postfurcal; parallel vein (CU1a) interstitial; brachial (first subdiscal) cell closed apically and often before recurrent (1m-cu) vein; hind wing without nervellus (cu-a); submedial (subbasal) cell absent; first recurrent vein (m-cu) absent; medial (basal) cell narrow and always closed antero-posteriorly; first metasomal tergite usually rather wide, with distinct dorsope; acrosternite of first segment short, about 0.2 × as long as first tergite; second metasomal suture shallow and straight or weakly curved, sometimes absent; second tergite without furrows or delineated area; ovipositor long.

Distribution. Australasian, Afrotropical, Nearctic, Neotropical and Oriental regions.

Hosts. Sphaerotrypes Blandford, 1894, Phthorophloeus Rey, 1883, Phloeosinus Chapuis, 1873 ( Coleoptera: Curculionidae, Scolytinae) (Yu et al. 2016).