Derelomus

Schönherr, 1825

Species Guides

1

Derelomus is a of weevils (Curculionidae: Derelomini) distributed across the Afrotropical and Mediterranean regions. The genus comprises 32 recognized , organized into four main species groups based on morphological and molecular data. Species exhibit specialized site pollination mutualisms with plants, with different species groups associated with distinct plant : Fabaceae (Vachellia), Achariaceae/Ebenaceae, Strelitziaceae/Arecaceae (Strelitzia and Phoenix reclinata), and Arecaceae palms (Chamaerops, Cocos, Phoenix). are small weevils with rostrate typical of the family.

Pronunciation

How to pronounce Derelomus: //dɛˈrɛloʊməs//

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Identification

Small weevils with the characteristic elongated rostrum of Curculionidae. -level identification requires examination of male terminalia and reference to the four species groups defined by associations: D. signatus group (associated with Vachellia), D. pallidus group (Achariaceae/Ebenaceae), D. nigrovariegatus group (Strelitzia/Phoenix reclinata), and D. ephippiger group (palms). The 2025 monograph provides diagnostic keys and redescriptions for all 32 species.

Habitat

Inflorescences of plants; specific associations include flowering structures of Vachellia (Fabaceae), Achariaceae, Ebenaceae, Strelitzia (Strelitziaceae), and various palms (Arecaceae: Chamaerops, Cocos, Phoenix, Phoenix reclinata).

Distribution

Afrotropical region (excluding Madagascar) and Mediterranean region.

Host Associations

  • Vachellia (Fabaceae) - site pollination mutualismD. signatus group; eight
  • Achariaceae - site pollination mutualismD. pallidus group
  • Ebenaceae - site pollination mutualismD. pallidus group
  • Strelitzia (Strelitziaceae) - site pollination mutualismD. nigrovariegatus group
  • Phoenix reclinata (Arecaceae) - site pollination mutualismD. nigrovariegatus group
  • Chamaerops (Arecaceae) - site pollination mutualismD. ephippiger group; male inflorescences specifically
  • Cocos (Arecaceae) - site pollination mutualismD. ephippiger group; male inflorescences specifically
  • Phoenix (Arecaceae) - site pollination mutualismD. ephippiger group; male inflorescences specifically

Life Cycle

Nursery pollination system: weevils complete their within plant inflorescences, using them as both breeding sites and food sources for larvae.

Behavior

Specialized site pollination mutualism with plants. abundance shows negative -dependence in some : higher local density of host plants reduces per-plant weevil abundance, suggesting competitive interactions shape spatial occupancy. Distribution is driven by local resource availability rather than broader host plant arrangement.

Ecological Role

site of tropical and Mediterranean flora. Enhance pollination success and fruit set in dense plant patches at small spatial (2–15 m). Form specialized plant-pollinator mutualistic systems with distinct host plant lineages.

Similar Taxa

  • Other Derelomini generaShare tribe-level characteristics; distinguished by associations and morphological features detailed in taxonomic keys
  • Generalist flower-visiting weevilsDerelomus exhibits obligate nursery pollination mutualism rather than facultative flower visitation; specificity and integration differ

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