Eustylini

Eustylini is a primarily Neotropical weevil tribe in the subfamily Entiminae.^[1]

Eustylini
Compsus auricephalus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Cucujiformia
Family:	Curculionidae
Subfamily:	Entiminae
Tribe:	Eustylini Lacordaire, 1863
Genera
See text

Taxonomy

The tribe Eustylini was named for the first time by Jean-Baptiste Henri Lacordaire in 1863,^[2] although, when first named, the tribe (Groupe Eustylides, p. 205) only contained three genera: Aptolemus (currently in Naupactini), Brachystylus, and Eustylus.

In 1986 the Eustylini contained most of its current genera, mostly due to revised taxonomic placements made by Guillermo Kuschel.^[3][1] The latest additions were made by Franz in 2012 by transferring former members of other tribes including Geonemini, Phyllobiini, and Tanymecini.^[4]

The type species of some genera (Compsus, Diaprepes, Eustylus, Exorides, and Exophthalmus) were redescribed by Franz.^[5] Most species of Eustylini are only known from their original descriptions.^[6]

Description

A diagnosis for the tribe was offered by Girón 2020:^[6]

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).

— J.C. Girón, Status of knowledge of the broad-nosed weevils of Colombia (Coleoptera, Curculionidae, Entiminae).

Heads in dorsal view: A Exophthalmus B Synthlibonotus C Exorides D Eustylus with characteristic broad antennal scape.

Distribution

Eustylini ranges from south-western USA to Argentina, with its highest diversity in the Caribbean, Central America and northern South America.^[1][3][7]

Genera

The tribe Eustylini currently includes 25 genera and 339 sdescribed species:^[3][4]

• Achrastenus Horn, 1876 ^[8]
• Anidius Kuschel, 1955 ^[9]
• Brachyomus Lacordaire, 1863 ^[2]
• Brachystylus Schönherr, 1845 ^[10]
• Chauliopleurus Champion, 1911 ^[11]
• Compsoricus Franz, 2012 ^[4]
• Coconotus Anderson & Lanteri, 2002 ^[12]
• Compsus Schönherr, 1823 ^[13]
• Diaprepes Schönherr, 1823 ^[13]
• Eustylus Schönherr, 1842 ^[14]
• Exophthalmus Schönherr, 1823 ^[13]
• Exorides Pascoe, 1881 ^[15]
• Galapagonotus Anderson & Lanteri, 2002 ^[12]
• Oxyderces Schönherr, 1823 ^[13]
• Pachnaeus Schönherr, 1826 ^[16]
• Parthenides Kuschel, 1986 ^[3]
• Phaops Sahlberg, 1823 ^[17]
• Phaopsis Kuschel, 1955 ^[9]
• Pseudeustylus Champion, 1911 ^[11]
• Rhinospathe Chevrolat, 1878 ^[18]
• Simophorus Faust, 1892 ^[19]
• Synthlibonotus Schönherr, 1847 ^[20]
• Tetrabothynus Labram & Imhoff, [1852] ^[21]
• Tropirhinus Schönherr, 1823 ^[13]
• Xestogaster Marshall, 1922 ^[22]