Entiminae

The combination of a broad, short rostrum and presence of a mandibular scar reliably distinguishes Entiminae from other Curculionidae subfamilies. The mandibular scar appears shortly after adult emergence and persists throughout life. Flight ability can be assessed externally by examining elytral shoulder development: well-developed shoulders indicate fully winged, potentially volant individuals, while reduced or absent shoulders indicate flightless forms. Tribal-level identification requires examination of genitalia and other detailed morphological features.

Adults possess a broad, short rostrum that distinguishes them from other weevil groups with elongated snouts. Most species exhibit a distinctive mandibular scar resulting from the loss of a deciduous process shortly after adult emergence from the pupal stage. Integument coloration varies widely, including black, reddish, orange, and metallic hues. Many species are covered by scales arranged in diverse patterns; these scales contain three-dimensional photonic crystals that produce iridescence. Wing development is variable: fully winged species have well-developed elytral shoulders (outer anterior corners of elytra), while flightless (apterous or brachypterous) forms show reduced or absent elytral shoulders.

Primarily associated with vegetation in diverse environments including forests, cultivated areas, and urban settings. Soil-dwelling and leaf litter communities contain substantial diversity often overlooked in standard surveys. Many species show preference for habitat or substrate type rather than strict plant specificity. Abundance trends differ by disturbance level: cultivated areas tend to have higher abundance but lower diversity, while forested or less disturbed areas show higher diversity with lower abundance.

Worldwide distribution with over 12,000 described species. Most tribes are restricted to single biogeographic regions. Well-documented faunas include Australia (700+ described species), Colombia (224 species, 142 endemic), and the Macaronesian region (notable radiations in genus Laparocerus). The subfamily occurs across all major biogeographic realms, though species-level endemism is common at regional and island scales.

Adults feed primarily on foliage; larvae feed externally on roots in soil. Most species are polyphagous, feeding on broad ranges of angiosperms across monocotyledonous and dicotyledonous families including Fabaceae, Malvaceae, Rutaceae, and Solanaceae. Some species are oligophagous with narrower host ranges. A few species are recorded from gymnosperms.

• Fabaceae - adult feeding, larval root feedingpolyphagous species
• Malvaceae - adult feeding, larval root feedingpolyphagous species
• Rutaceae - adult feeding, larval root feedingpolyphagous species
• Solanaceae - adult feeding, larval root feedingpolyphagous species
• Citrus - pest damagesome species recognized as pests
• potatoes - pest damagesome species recognized as pests

Holometabolous development with egg, larval, pupal, and adult stages. Larvae are soil-dwelling and feed externally on roots. Adults emerge from pupal stage with a deciduous mandibular process that is shed shortly after emergence, leaving a permanent mandibular scar. Over 50 species have been reported as parthenogenetic, though this represents a small fraction of total diversity.

Adults do not use the rostrum to prepare oviposition sites, unlike many other weevil groups. Eggs may be laid loosely on substrate or in clusters glued onto vegetation. Many species are flightless; this condition is associated with island radiations and stable habitats. Flightless species in the genus Laparocerus have undergone extensive adaptive radiation in Macaronesia, with colonization patterns showing sequential radiation across islands of decreasing geological age.

Herbivores acting as folivores (adults) and root feeders (larvae). Some species function as agricultural or horticultural pests, though most are not economically significant. Soil and leaf litter communities contribute to decomposition processes and nutrient cycling. High diversity in undisturbed habitats suggests potential roles as indicators of ecosystem integrity.

A minority of species are significant agricultural and horticultural pests causing economic damage to crops. Introduced species in Australia and elsewhere have become established pests. The subfamily is abundant in entomological collections and frequently encountered in urban environments, making it accessible for ecological and evolutionary research. The genus Laparocerus has been proposed as a model system for studying island evolution and speciation processes.

• Other Curculionidae subfamiliesEntiminae distinguished by broad, short rostrum and mandibular scar; other subfamilies typically have elongated rostrums and lack the characteristic mandibular scar
• BrachycerinaeBoth are short-nosed weevil groups, but Entiminae is defined by the mandibular scar and different larval biology (external root feeding vs. internal feeding in many Brachycerinae)

• weevils
• broad-nosed weevils
• polyphagous herbivores
• flightless insects
• island radiation
• agricultural pests
• soil fauna
• leaf litter fauna

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Weevil genus beats records in Macaronesia | Blog
• Four new Entiminae from the Mediterranean region (Coleoptera: Curculionidae: Entiminae: Phyllobiini, Trachyphloeini), with additional data on the distribution of some poorly known species
• Australian Weevils (Coleoptera: Curculionoidea) IV
• Supplementary material 1 from: Girón JC (2020) Status of knowledge of the broad-nosed weevils of Colombia (Coleoptera, Curculionidae, Entiminae). Neotropical Biology and Conservation 15(4): 583-674. https://doi.org/10.3897/neotropical.15.e59713
• Taxonomic Revision of the South American Genus Eudius and First Insights into the Phylogeny of the Tribe Eudiagogini (Curculionidae: Entiminae).
• Metapocyrtus (Dolichocephalocyrtus) aliwagwag sp. nov., a new flightless weevil (Curculionidae, Entiminae, Pachyrhynchini) from the Aliwagwag Protected Landscape, Mindanao Island, Philippines.