Hylobiini

Hylobiini is a tribe of within the Molytinae (). The tribe includes approximately 89 in the Heilipus, which are distributed across the Americas. Members of this tribe are primarily associated with the Lauraceae, with some species functioning as seed in fruits and others as bark-boring pests. The tribe contains three subtribes: Epistrophina, Hylobiina, and Incertae sedis.

Heilipus squamosus by (c) Dan Schofield, some rights reserved (CC BY), uploaded by Dan Schofield. Used under a CC-BY license.

Heilipus squamosus by (c) Gordon C. Snelling, some rights reserved (CC BY), uploaded by Gordon C. Snelling. Used under a CC-BY license.

Hylobiini by (c) John P Friel, some rights reserved (CC BY), uploaded by John P Friel. Used under a CC-BY license.

Pronunciation

How to pronounce Hylobiini: //hɪ.lɒ.biˈaɪ.naɪ//

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

Identification

Hylobiini can be distinguished from other Molytinae tribes by morphological characters of the Heilipus and related genera, though specific diagnostic features for the tribe as a whole are not detailed in available sources. The subtribes are distinguished by genus-level : Epistrophina contains genera such as Cyriaspis and Epistrophus; Hylobiina contains the large genus Heilipus along with Hylobius, Pachylobius, and numerous other genera; Incertae sedis includes genera of uncertain placement such as Achelocis and Tranes.

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Habitat

Associated with forests and woodlands containing plants in the Lauraceae. In the United States, found in coastal plains, swampy areas, and forests with potential Lauraceae hosts including pondberry, pondspice, redbay, and sassafras. In Brazil, occurs in south and southeast regions in association with Lauraceae fruit-bearing trees.

Distribution

Americas. The Heilipus contains 89 described with 28 species occurring in Brazil. The sole United States representative, Heilipus squamosus, occurs in the southeastern United States and has been recorded from Alabama, Florida, Georgia, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, Arkansas, Kansas, Kentucky, Louisiana, Missouri, Oklahoma, and Texas.

Diet

Variable across . Heilipus function as seed , with developing within fruits of Lauraceae. Heilipus squamosus larvae feed under bark near ground level and can trees. plants include avocado (Persea americana), pondberry (Lindera melissifolia), pondspice (Litsea aestivalis), redbay (Persea borbonia), sassafras (Sassafras albidum), camphor (Cinnamomum camphora), Ocotea puberula, and Nectandra angustifolia.

Host Associations

Lindera melissifolia - suspected pondberry, unconfirmed by rearing records
Litsea aestivalis - suspected pondspice, unconfirmed by rearing records
Persea borbonia - suspected redbay, unconfirmed by rearing records
Sassafras albidum - suspected unconfirmed by rearing records
Persea americana - pest avocado, confirmed for Heilipus squamosus in Florida
Cinnamomum camphora - non- camphor, recorded for Heilipus squamosus
Ocotea puberula - confirmed rearing records for Heilipus vividaensis and H. draco in Brazil
Nectandra angustifolia - confirmed rearing records for Heilipus vividaensis and H. draco in Brazil
Diospyros virginiana - possible wild persimmon, three specimens from Virginia, unconfirmed
Apocynum cannabinum - possible dogbane hemp, one observation from Virginia, unconfirmed

Life Cycle

of Heilipus develop within fruits of Lauraceae, acting as seed . Heilipus squamosus larvae feed under bark near ground level and can trees; an unidentified larva similar in size to was found causing feeding damage to the root collar at the base of a pondberry .

Behavior

Heilipus squamosus are found on plants; debarking damage has been observed on pondspice and redbay branches. The was historically considered rare outside avocado-producing areas but appears more abundant based on recent citizen science observations. occurrence of closely related Heilipus species on shared host plants has been documented in Brazil.

Ecological Role

Seed on Lauraceae fruits. Heilipus squamosus is a pest of avocado, causing 8-10% tree loss in Florida groves during the 1940s-1950s. Potential association with threatened and endangered Lauraceae: pondberry is federally endangered and pondspice is federally threatened. The tribe may be affected by the spread of laurel , which threatens native Lauraceae .

Human Relevance

Heilipus squamosus was a major pest of avocado in Florida during the mid-20th century, causing significant . The was historically rare in collections, with only 57 specimens known, but citizen science data has revealed it to be more widely distributed than previously recognized.

Similar Taxa

Other Molytinae tribesHylobiini is distinguished within Molytinae by its subtribal structure and association with Lauraceae, though specific morphological distinctions from other tribes are not detailed in available sources.

More Details

Subtribal classification

Hylobiini contains three subtribes: Epistrophina (9 including Cyriaspis, Epistrophus, and Typacrus), Hylobiina (approximately 40 genera including the large genus Heilipus with 89 , plus Hylobius, Pachylobius, and others), and Incertae sedis (12 genera of uncertain placement including Achelocis, Tranes, and Memes).

Taxonomic note on Heilipus apiatus

Heilipus apiatus (Olivier, 1807) was long confused with H. squamosus due to an erroneous distribution given in Olivier's 1807 description. H. apiatus is now recognized as a distinct from French Guiana, very different from the southeastern United States H. squamosus.

Range expansion

Heilipus squamosus shows evidence of recent range expansion, with all records from seven newly-recorded states (Arkansas, Kansas, Kentucky, Louisiana, Missouri, Oklahoma, Texas) occurring in the 21st century and no historical specimens found from these states.