Molytini

Identification to tribe level requires examination of morphological characters associated with the subtribe Hylobiina, including ventrite-femoral stridulatory systems with two distinct morphological types: system type 1 in Heilus and system type 2 in Heilipodus. Species-level identification relies on integument texture and maculation patterns.

Tropical forests, particularly regions with high Lauraceae diversity. The Brazilian Atlantic Forest has been identified as a region of exceptional diversity for some Molytini lineages.

Neotropical region, ranging from the southern United States to northern Argentina. Distribution varies by genus: Heilipus occurs from the southern United States to northern Argentina; Heilus species are predominantly South American with emphasis on Brazil.

Oligophagous feeding habits documented for some members; larval stages feed as borers of seeds or trunks of host plants. Specific dietary information for the tribe as a whole is not established.

• Lauraceae - larval hostPrimary host family for seed-boring and trunk-boring species in Heilipus; 33 species in 12 genera documented
• Annonaceae - larval hostSecondary host family; 5 species in one genus documented for Heilipus
• Persea americana - larval hostAvocado; economically important host for pest species in Heilipus
• Theobroma cacao - larval hostCacao; host for Heilus species
• Anacardium occidentale - larval hostCashew; host for Heilus species
• Annona spp. - larval hostHost for Heilus species
• Ilex paraguariensis - larval hostYerba mate; host for Heilus species
• Araucaria angustifolia - larval hostBrazilian pine; host for Heilus species

Larval development occurs within host plant tissues. Two feeding guilds are recognized: seed borers, which develop within seeds before dispersal, and trunk borers, which develop in woody stems. Specific life cycle details for the tribe beyond these general patterns are not established.

Stridulation via ventrite-femoral mechanisms is present in the subtribe Hylobiina, representing a novel sound production system distinct from other Curculionidae. Two morphologically distinct stridulatory system types have been identified. Oligophagous feeding behavior with host specialization at the family or genus level has been documented in some lineages.

Seed-boring species in the genus Heilipus constitute primary pre-dispersal seed predators of Lauraceae in the Americas. Trunk-boring species contribute to wood decomposition and nutrient cycling. Some species function as agricultural pests, causing economic damage to avocado, cacao, and cashew crops.

Several species are economically significant agricultural pests. Heilipus species damage avocado crops throughout the Americas. Heilus species have been documented as pests of cacao, cashew, and yerba mate plantations.

• other Molytinae tribesMolytini is distinguished within Molytinae by the presence of ventrite-femoral stridulatory systems in Hylobiina and by larval feeding strategies involving seed and trunk boring in woody hosts

• BugGuide
• iNaturalist taxon
• NCBI Taxonomy
• Host plants of the weevil genus Heilipus Germar, 1824 (Coleoptera, Curculionidae, Molytinae, Molytini, Hylobiina)
• Description of a new ventrite-femoral stridulatory system in the subtribe Hylobiina (Coleoptera: Curculionidae: Molytinae: Molytini)
• A review of the South American species of Heilus Kuschel, 1955 (Curculionidae: Molytinae: Molytini: Hylobiina) with emphasis on those from Brazil
• Figure 1 from: Díaz-Grisales V, Romero-Nápoles J, González-Hernández H, Girón Duque JC, Bautista-Martínez N, Castañeda-Vildózola Álvaro, Anzaldo S, Lourenção AL (2024) Host plants of the weevil genus Heilipus Germar, 1824 (Coleoptera, Curculionidae, Molytinae, Molytini, Hylobiina). Contributions to Entomology 74(2): 217-234. https://doi.org/10.3897/contrib.entomol.74.e129094
• Supplementary material 1 from: Díaz-Grisales V, Romero-Nápoles J, González-Hernández H, Girón Duque JC, Bautista-Martínez N, Castañeda-Vildózola Álvaro, Anzaldo S, Lourenção AL (2024) Host plants of the weevil genus Heilipus Germar, 1824 (Coleoptera, Curculionidae, Molytinae, Molytini, Hylobiina). Contributions to Entomology 74(2): 217-234. https://doi.org/10.3897/contrib.entomol.74.e129094