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Beetles of Zihuatanejo

ORDER COLEOPTERA

Exophthalmus Weevils
Exophthalmus (Genus)

-Animals (Kingdom Animalia)

-Arthropods (Phylum Arthropoda)

-Hexapods (Subphylum Hexapoda)

-Insects (Class Insecta)

-Winged and Once-winged Insects (Subclass Pterygota)

-Beetles (Order Coleoptera​​)

-​Water, Rove, Scarab, Long-horned, Leaf, and Snout Beetles (Suborder Polyphaga)

-​Cucujiform Beetles (Infraorder Cucujiformia)

-Snout and Bark Beetles (Superfamily Curculionoidea)

-​True Weevils (Family Curculionidae)

-​Broad-nosed Weevils (Subfamily Entiminae)

-Tribe Eustylini

-Genus Exophthalmus


The Exophthalmus broad-nosed weevil refers to a group of beetles within the family Curculionidae, specifically in the genus Exophthalmus. These weevils are characterized by a broad, flattened body and a distinctively broad rostrum (snout) that is often a defining feature of weevils in general. The term "exophthalmus" typically refers to the condition of having bulging eyes, which may relate to the physical appearance of some species within this genus.

Diet

  • Adults: Primarily herbivorous, feeding on leaves, buds and tender plant tissues. Many species are associated with woody plants, shrubs and agricultural crops.

  • Larvae: Generally develop in the soil, where they feed on plant roots and underground tissues.

  • Some species can become agricultural pests when adults cause significant foliage damage or larvae attack roots.

Range

  • Exophthalmus is a predominantly Neotropical genus, with species distributed through Mexico, Central America, the Caribbean and northern South America.

  • Mexico has numerous species, particularly in tropical and subtropical regions.

  • Species occur in Guerrero, including habitats around the Zihuatanejo region.

Habitat

  • Found in tropical dry forest, tropical deciduous forest, rainforest, woodland edges, scrub, agricultural areas and secondary vegetation.

  • Adults occur primarily on foliage and stems, while larvae live underground around the roots of host plants.

  • Many species are most active during warm, humid conditions following rainfall.

Size

  • Adult length: approximately 6–15 mm (0.24–0.6 in).

  • Body generally robust and oval, with a broad rostrum and elbowed antennae.

  • Many species have striking metallic green, blue, bronze or grey scales, while others are brown or mottled.

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