Cebrioninae
| Cebrioninae | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Coleoptera |
| Family: | Elateridae |
| Subfamily: | Cebrioninae |
Cebrioninae is a subfamily of click beetles from the Elateridae family.
The genus Cebrioninae lives in most parts of the world, but they are absent from Australia and New Zealand. They are particularly abundant in the more arid parts of the Holarctic Region, Nearctic, Palearctic, Neotropical, Afrotropical, Oriental.
The male Cebrioninae fly at night and may be attracted to lights. In several genera, including Cebrio, Selonodon and Euthysanius, females are flightless, and other groups are known from males only. All known larvae live in the soil.
The species are 8–20 mm. in length. Ratio of body length to greatest body width 2.5–4.55. Body slightly flattened to moderately convex. Sides of body not evenly curved. Body not capable of conglobation (rolling into a ball). Upper surfaces of body clothed with distinct hairs, setae or scales. Vestiture of upper surfaces not including stiff, erect, dark bristles; not including scales or scale-like setae. Upper surfaces of body without deep foveae. Prothorax, metathorax and-or abdomen without extrusible glands. Underside of body without hydrofuge surface(s).
Ratio of head length to its greatest width (excluding eyes) 1 or less. Head width just behind eyes not distinctly greater than prothoracic width. Head not or slightly declined, or moderately to strongly declined; not entirely concealed from above by pronotum; without elongate rostrum; not abruptly constricted posteriorly. Temples absent or not closely adpressed to prothorax; absent. Transverse occipital ridge or carina absent. Occiput without stridulatory file. Longitudinal axis of head (from occipital foramen to mouth cavity) inclined at an angle of less than 45 degrees, or inclined at an angle of 45 to 90 degrees. Frontal region not to moderately, gradually declined. Occipital region without median longitudinal groove or line (endocarina). Frontal region without median groove or line (endocarina). Head without ocelli.
The eyes are strongly protuberant. Vertical diameter of an eye is less than 2 times horizontal diameter. The eyes finely facetted; without interfacetal setae. Ommatidium of the exocone type. Eye entire. Anterior or mesal edge of eye not or only barely emarginate. Posterior edge of eye not or barely emarginate. Antennal insertions exposed from above, or concealed from above; moderately to widely separated. Antennae not borne on raised tubercles. Subantennal groove or cavity on head absent or very weakly developed. Frontoclypeal suture absent or incomplete. Clypeus is not laterally emarginate. Anterior edge of clypeus or clypeolabrum straight to . Mouth cavity anteriorly or anteroventrally oriented. Pregular area without laterally opening cavities. Head ventrally without paired subgenal ridges, or with paired subgenal ridges. Head without anteriorly-projecting genal processes. sutures widely separated or absent. Corporotentorium narrow; without median process. Cervical sclerites present.
...
Wikipedia