Rhinostomus

Rafinesque, C.S., 1815

yucca weevils, bearded weevil, bottle brush weevil

Species Guides

Rhinostomus frontalis(yucca weevil)

Rhinostomus is a of weevils in the Dryophthoridae, tribe Rhinostomini. The genus contains approximately eight distributed across the Neotropics. Several species, particularly R. barbirostris, are significant pests of palms (Arecaceae), causing damage through larval and feeding that can lead to palm mortality. The genus was formerly known as Yuccaborus, which was synonymized with Rhinostomus in 2002.

Pronunciation

How to pronounce Rhinostomus: //raɪˈnɒstoʊməs//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Members of Rhinostomus can be distinguished from other weevil by features of the tribe Rhinostomini, which is . Males of R. barbirostris possess a distinctive elongated rostrum with dense setae, earning the "bearded weevil" or "bottle brush weevil." The genus was previously confused with Yuccaborus, but taxonomic revision in 2002 clarified their synonymy.

Habitat

within this occur in tropical and subtropical environments, particularly in association with palm trees. In Mexico, R. barbirostris shows broad suitability across montane humid forests and tropical humid forests. The genus has been recorded in native forest reserves and areas with palm .

Distribution

Pantropical distribution spanning North America (Mexico), Central America, the Caribbean, and South America. Documented from Mexico, Belize, Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Nicaragua, Panama, Trinidad, Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Suriname, and Venezuela. First record in southwestern Amazonia (Acre, Brazil) documented in 2024.

Diet

Larvae and feed on palms (Arecaceae). Documented associations include coconut palm, oil palm, Brahea dulcis (sweet palm), and Oenocarpus bataua.

Host Associations

Cocos nucifera - pestcoconut palm
Elaeis guineensis - pestoil palm
Brahea dulcis - pestsweet palm; significant documented in Tehuacán-Cuicatlán Reserve, Mexico
Oenocarpus bataua - pestfirst record of edible larvae in Acre, Brazil, 2024

Behavior

Larvae and cause significant damage to palms through feeding, leading to palm death in conditions. Males of R. barbirostris possess dense setae on the rostrum; function unstudied but may serve tactile or display purposes.

Ecological Role

Pest of native and cultivated palm with ecological and economic impacts. can cause substantial mortality of ecologically important palm .

Human Relevance

Economic pest of coconut and oil palm . Larvae of R. barbirostris are consumed as food in parts of the Amazon, representing a traditional food source. The requires monitoring and management to protect palm .

Similar Taxa

YuccaborusFormerly treated as separate ; synonymized with Rhinostomus in 2002 based on cladistic analysis. Y. frontalis transferred to Rhinostomus as R. frontalis.

More Details

Taxonomic history

The Yuccaborus was synonymized with Rhinostomus in 2002 by Morrone and Cuevas based on cladistic analysis. The Yuccaborus frontalis was transferred to Rhinostomus as R. frontalis.

Research gaps

No research has investigated the function of dense setae on male rostra, despite their conspicuous . details and reproductive remain poorly documented for most .