Eustylini

Classification

Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Superfamily: Curculionoidea
Family: Curculionidae
Subfamily: Entiminae
Tribe: Eustylini

Pronunciation

How to pronounce Eustylini: //juːˈstaɪlɪnaɪ//

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Images

Summary

Eustylini is a tribe of weevils in the subfamily Entiminae, characterized by their varied scale coverage and distinct morphological features. The tribe has evolved through the integration of genera previously placed in other tribes, demonstrating a rich taxonomic history.

Physical Characteristics

Medium to large weevils (approx. 10–25 mm); scale coverage highly variable in presence, density and coloration; iridescent scales, erect setae or waxy secretions are frequently present; surface smooth and even or strongly sculptured and irregular; head (including rostrum) subrectangular, nearly as long or longer than wide; eyes small to mid-sized, slightly dorsally positioned; frons usually as wide as or narrower than interantennal distance, often bearing median fovea; rostrum nearly parallel-sided or broadened apically; dorsal surface of rostrum with variable elevations or depressions, including longitudinal carinae or oblique fossae; antennal scrobe generally fully visible in dorsal view; nasal plate usually well developed, either depressed, flat or elevated regarding surface of rostrum; anterior margin of prothorax in lateral view straight, seldom slightly sinuate, never forming conspicuous postocular lobe; postocular setae may be present, if so, forming a fringe instead of a tuft; elytral shoulders usually well-developed, absent in Brachyomus, reduced in some Compsus and Exorides; tubercles and apical projections may be present on elytra; femora usually not toothed (except in some Eustylus).

Identification Tips

Look for medium to large weevils with variable scale coverage, a subrectangular head, and a rostrum that may be nearly parallel-sided or broadened apically.

Habitat

Primarily found in the Neotropical region, ranging from south-western USA to Argentina, with higher diversity in the Caribbean, Central America, and northern South America.

Distribution

South-western USA to Argentina; highest diversity in the Caribbean, Central America, and northern South America.

Evolution

The tribe was first named by Jean-Baptiste Henri Lacordaire in 1863 and has undergone numerous taxonomic revisions over the years.