Diomus is a genus of lady beetles that belongs to the family Coccinellidae. It can be found worldwide.
It can grow to a length of 1.2-3.5 mm. Its body is a elongated oval that is weakly convex. The coloration of their body and elytra is variable.
Distribution Members of this genus can be found worldwide with many species occurring in tropical and subtropical regions including adjacent islands. They are mainly found in neotropical regions with more than 260 species described. The Australian region has 77 species with an estimated 140. Both the afrotropical and palaeartic regions contains 7 species and the oriental region contains 4 species.Bi, Keke & Liang, Xinyue & Peng, Feng & Huo, Lizhi & Chen, Xiaosheng. (2023). Contribution to the knowledge of the ladybird beetle genus Diomus Mulsant (Coleoptera: Coccinellidae), with description of a new species from China. Zoological Systematics. 10.11865/zs.2023121.
Taxonomy This genus was originally described by Étienne Mulsant, a French entomologist and ornithologist, in 1850 as a subgenus of Scymnus. It was than elevated to its own genus in 1895 by Weise. However its status as its own genus within the tribe Scymnini or a subgenus of Scymnus was controversial. (Chapin, 1933) considered it its own genus immediately distinguishing it from Decadiomus. Some thought that it was a subgenus of Nephus. In 1999, Gordon suggested that this genus was a allogenic genus from Scymnini and proposed the tribe Diomini.
Species This genus is probably one of the largest genera in the family Coccinellidae. This genus currently contains more than 400 described species worldwide with many species possibly being undescribed. A list of species belonging to this genus can be found below:
Diomus akonis (Ohta, 1929) g Diomus amabilis (LeConte, 1852) i c g b (amiable lady) Diomus arizonicus Gordon, 1976 i c g Diomus austrinus Gordon, 1976 i c g Diomus balteatus (LeConte, 1878) i c g Diomus bigemmeus (Horn, 1895) i c g b Diomus caledoniensis (Bielawski, 1973) g Diomus chiriqui González & Větrovec, 2021 Diomus debilis (Leconte, 1852) i c g b Diomus floridanus (Mulsant, 1850) i c g Diomus gillerforsi Fursch, 1987 g Diomus humilis Gordon, 1976 i c g Diomus liebecki (Horn, 1895) i c g b (Liebeck's lady) Diomus myrmidon (Mulsant, 1850) i c g Diomus notescens (Blackburn, 1889) i Diomus ochroderus (Mulsant, 1850) g Diomus panamensis González & Větrovec, 2021 Diomus pseudotaedatus Gordon, 1976 i c g b Diomus pumilio (Weise, 1885) i c g Diomus roseicollis (Mulsant, 1853) i c g b Diomus rubidus (Motschulsky, 1837) g Diomus sekerkai González & Větrovec, 2021 Diomus sexualis (Fauvel, 1903) g Diomus taedatus (Fall, 1901) i c g Diomus tetricus González, 2015 Diomus terminatus (Say, 1835) i c g b Diomus texanus Gordon, 1976 i c g b Diomus thoracicus (Fabricius, 1801) g Diomus xanthaspis (Mulsant, 1850) i c g b Australian species
Diomus ancorus Diomus australasiae Diomus australis Diomus bimaculatus Diomus brisbanensis Diomus brookfieldi Diomus bunya Diomus capital Diomus carbine Diomus casuarinae Diomus circus Diomus corticalis Diomus cowleyi Diomus cucullifer Diomus denhamensis Diomus elutus Diomus ementitor Diomus ferrugineus Diomus flavolaterus Diomus frater Diomus gilvus Diomus gingera Diomus hamatus Diomus hebes Diomus impictus Diomus inaffectatus Diomus insidiosus Diomus inusitatus Diomus jocosus Diomus kamerungensis Diomus kioloa Diomus kosciuszko Diomus kuranda Diomus leai Diomus lord Diomus lubricus Diomus macrops Diomus maestus Diomus mareebensis Diomus marmorosus Diomus micrus Diomus millaamillaa Diomus ningning Diomus norfolcensis Diomus notescens Diomus obumbratus Diomus operosus Diomus pisinus Diomus planulatus Diomus poonindiensis Diomus prodigialis Diomus pumilio Diomus reidi Diomus robustus Diomus scapularis Diomus sedani Diomus simplex Diomus sphragitis Diomus storeyi Diomus striatus Diomus subclarus Diomus subelongatulus Diomus sublatus Diomus sydneyensis Diomus tasmanicus Diomus tenebricosus Diomus tinaroo Diomus torres Diomus triangularis Diomus variiceps Diomus victoriensis Diomus villus Diomus weiri Diomus whittonensis Diomus yarrensis Diomus zborowskii
Data sources: i = ITIS, c = Catalogue of Life, g = GBIF, b = Bugguide.net
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