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Wikipedia / Bean weevil

Bean weevils, also known as seed beetles, are members of the beetle subfamily Bruchinae. They are placed in the leaf beetle family Chrysomelidae, though they were historically treated as a separate family. Despite being called "bean weevils", they are not true weevils. The subfamily includes about 1,650 species and are found worldwide.

Bean weevils are generally compact and oval in shape, with small heads somewhat bent under. Sizes range from for some tropical species. Colors are usually black or brown, often with mottled patterns. Although their mandibless may be elongated, they do not have the long snouts characteristic of other weevils. A defining characteristic of this subfamily is that the elytra don't quite reach the tip of their abdomenss (as seen in the header image).

The Bruchinae are granivores, and typically infest various kinds of seeds or beans (hence their common names), living most of their lives inside a single seed; Host plants tend to be legumes, but species will also be found in Convolvulaceae, Arecaceae, and Malvaceae. The adults deposit eggs on seeds of these plants, then the larvae chew their way into the seed. When ready to pupate, the larvae typically cut an exit hole, then return to their feeding chamber. Due to this, several species are considered pestss. The adult weevils have a habit of feigning death and dropping from a plant when disturbed.

Several species are native to Great Britain, but there are also records of several introduced species from stored products in warehouses and dwellings, although these species cannot proliferate outside of heated buildings in that climate.

Genera

This list of genera uses the new classification scheme, treating the bean weevils as a subfamily with six extant tribes, eight or nine subtribes, and one extinct tribe. The former names and ranks for the tribes and subtribes under the old classification, treating the been weevils as a family, are given in parentheses (except for Myanmaropini, which was established only for the new classification).

Tribe Amblycerini Bridwell, 1932 (= Subfamily Amblycerinae)

Subtribe Amblycerina Bridwell, 1932 (= Tribe Amblycerini)

Subtribe Spermophagina Borowiec, 1987 (= Tribe Spermophagini)

Tribe Bruchini Latreille, 1802 (= Subfamily Bruchinae)

Subtribe Acanthoscelidina Bridwell, 1946 (= Tribe Acanthoscelidini)

Subtribe Bruchidiina Bridwell, 1946 (= Tribe Bruchidiini)

Subtribe Bruchina Latreille, 1802 (= Tribe Bruchini)

Subtribe Megacerina Bridwell, 1946 (= Tribe Megacerini)

Tribe Eubaptini Bridwell, 1932 (= Subfamily Eubaptinae)

Tribe Kytorhinini Bridwell, 1832 (= Subfamily Kytorhininae)

Tribe Pachymerini Bridwell, 1929 (= Subfamily Pachymerinae)

Subtribe Caryedontina Bridwell, 1929 (= Tribe Caryedontini)

Subtribe Caryopemina Bridwell, 1929 (= Tribe Caryomepini)

Subtribe Pachymerina Bridwell, 1929 (= Tribe Pachymerini)

Tribe Rhaebini Chapuis, 1874 (= Subfamily Rhaebinae)

Tribe †Myanmaropini Legalov et al., 2020

Notes

References