Kikiki

Female. Head.Face about 1.7× as high as wide, slightly depressed medially (Fig. 24), separated ventrally from oral cavity by distinct epistomal suture. Clypeus transverse, in same plane as face, narrowly oval and extending entire width of oral cavity, with anterior tentorial pits visible sublaterally (Fig. 37). Mandible with lower tooth separated from remaining teeth by deeper notch than notches separating the teeth above it. Vertex (Figs 30, 40) laterally with well defined supraorbital trabecula divided medially; ocelli enclosed by a distinct, rectangular stemmaticum, the vertex thus divided into anterior (smooth) and posterior (faintly sculptured) areas by a transverse groove extending between eyes from just anterior to each supraorbital trabecula and along anterior margin of slightly triangular mid ocellus; lateral ocelli almost vertical, facing away from each other. Occiput separated from vertex by slightly curved groove extending between posterior apex of each supraorbital trabecula and almost touching lateral ocelli (Figs 40, 41), and occiput divided into dorsal and ventral areas by curved groove extending between lower margin of eyes and above foramen (Figs 25, 42). Head, except vertex anteriorly, with faint, reticulate sculpture. Mesosoma. Pronotum with a slightly crenulated dorsal margin (Figs 40, 42). Mesoscutum (Figs 26, 42, 44) with notauli narrow near anterior apex, distinctly widening (narrowly triangular) posteriorly to the medially deep and wide transscutal articulation. Scutellum with axilla strongly advanced anteriorly into lateral lobe of mesoscutum. Frenum apparently divided mediolongitudinally by a wide depression (Figs 44, 45). Mesosoma except anterior scutellum with faint, reticulate sculpture. Legs. Fore leg with bifurcate strigil and calcar with 4 rounded teeth, separated from one another by almost their own diameter (Fig. 34-male). Metasoma. Petiole (Fig. 26) extremely short and distinctly narrower that gt1. Terga each with a median transverse fold extending across tergum medially or nearer posterior margin (Figs 28, 45, 46). Male. Body 235 μm from transverse trabecula to gastral apex (Fig. 30). Antenna with 9segmented funicle (Fig. 33; Lin et al. 2007, fig. 154), with fl1 the shortest and fl9 the longest, and each segment with 2 mps. Eye large (Fig. 30) with many ommatidia (about 40?); ocular apodeme long, narrow and parallel side for most of its length, slightly widened apically (Fig. 32). Mandibles with 4 teeth. Occiput with strongly curved groove (Fig. 31) different in shape from female, apparently extending from mouthparts, along posterior eye margin, and inwards to lateral margins of foramen. Petiole short but distinct, about 3.7× as wide as long. Spiracle absent. Cerci with 4 setae. Genitalia encapsulated; aedeagus almost as long as aedeagal apodemes (Fig. 35). The male is described from a single slide-mounted specimen from Australia. No males have yet been collected in the New World. Whether the larger body and eyes of the Australian specimen are sex differences or indicative of a species different from Kikiki huna cannot be determined until females are obtained from the same locality in Western Australia and compared with the Hawaiian and Neotropical specimens.

Female. Head.Face about 1.7× as high as wide, slightly depressed medially (Fig. 24), separated ventrally from oral cavity by distinct epistomal suture. Clypeus transverse, in same plane as face, narrowly oval and extending entire width of oral cavity, with anterior tentorial pits visible sublaterally (Fig. 37). Mandible with lower tooth separated from remaining teeth by deeper notch than notches separating the teeth above it. Vertex (Figs 30, 40) laterally with well defined supraorbital trabecula divided medially; ocelli enclosed by a distinct, rectangular stemmaticum, the vertex thus divided into anterior (smooth) and posterior (faintly sculptured) areas by a transverse groove extending between eyes from just anterior to each supraorbital trabecula and along anterior margin of slightly triangular mid ocellus; lateral ocelli almost vertical, facing away from each other. Occiput separated from vertex by slightly curved groove extending between posterior apex of each supraorbital trabecula and almost touching lateral ocelli (Figs 40, 41), and occiput divided into dorsal and ventral areas by curved groove extending between lower margin of eyes and above foramen (Figs 25, 42). Head, except vertex anteriorly, with faint, reticulate sculpture. Mesosoma. Pronotum with a slightly crenulated dorsal margin (Figs 40, 42). Mesoscutum (Figs 26, 42, 44) with notauli narrow near anterior apex, distinctly widening (narrowly triangular) posteriorly to the medially deep and wide transscutal articulation. Scutellum with axilla strongly advanced anteriorly into lateral lobe of mesoscutum. Frenum apparently divided mediolongitudinally by a wide depression (Figs 44, 45). Mesosoma except anterior scutellum with faint, reticulate sculpture. Legs. Fore leg with bifurcate strigil and calcar with 4 rounded teeth, separated from one another by almost their own diameter (Fig. 34-male). Metasoma. Petiole (Fig. 26) extremely short and distinctly narrower that gt1. Terga each with a median transverse fold extending across tergum medially or nearer posterior margin (Figs 28, 45, 46). Male. Body 235 μm from transverse trabecula to gastral apex (Fig. 30). Antenna with 9segmented funicle (Fig. 33; Lin et al. 2007, fig. 154), with fl1 the shortest and fl9 the longest, and each segment with 2 mps. Eye large (Fig. 30) with many ommatidia (about 40?); ocular apodeme long, narrow and parallel side for most of its length, slightly widened apically (Fig. 32). Mandibles with 4 teeth. Occiput with strongly curved groove (Fig. 31) different in shape from female, apparently extending from mouthparts, along posterior eye margin, and inwards to lateral margins of foramen. Petiole short but distinct, about 3.7× as wide as long. Spiracle absent. Cerci with 4 setae. Genitalia encapsulated; aedeagus almost as long as aedeagal apodemes (Fig. 35). The male is described from a single slide-mounted specimen from Australia. No males have yet been collected in the New World. Whether the larger body and eyes of the Australian specimen are sex differences or indicative of a species different from Kikiki huna cannot be determined until females are obtained from the same locality in Western Australia and compared with the Hawaiian and Neotropical specimens.

Kikiki is a genus of fairyfly wasps containing a single species, Kikiki huna, known from Hawaii, Costa Rica, Nagarcoil and Trinidad. At 0.15 mm (0.0059 in) (150 μm), it is the smallest flying insect known as of 2019. It is a close relative of wasps in the genus Tinkerbella. It was discovered in the Hawaiian Islands by John T. Huber and John W. Beardsley, and published in 2000. The name Kikiki huna consists of two Hawaiian words that both carry the meaning 'tiny bit'.