Horismenus

Walker, 1843

Horismenus is a large of eulophid (: ) comprising over 400 described , primarily distributed in the Americas. Species are predominantly , with documented associations including (: : Bruchinae) in , beetles, , and other . Several species exhibit . The genus has been the subject of recent taxonomic revision due to cryptic revealed through molecular analysis.

Horismenus by no rights reserved, uploaded by Adam Pitcher. Used under a CC0 license.Horismenus cockerelli by the Smithsonian. Used under a CC0 license.Horismenus hypatia by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Horismenus: /hɒˈrɪsmɛnəs/

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Habitat

Diverse spanning wild and agricultural systems, including: seed pods of Phaseolus beans (P. vulgaris, P. coccineus, P. lunatus) in Mexican oak woodland, pine-oak woodland, and humid environments from sea level to over 2400 m elevation; seed pods of Pithecellobium dulce in northeastern Brazil; stems of Pereskia (Cactaceae) and Sechium edule (Cucurbitaceae); citrus groves (Belize); and Atlantic Forest (Minas Gerais, Brazil).

Distribution

Primarily Neotropical, with records from North, Central, and South America. Documented localities include: USA (California, Florida, Georgia, Hawaii, Arizona), Mexico (multiple states across altitudinal gradients), Honduras, Brazil (Amazonas, Minas Gerais, northeastern region), and Ecuador. Some show narrow altitudinal distributions (e.g., H. missouriensis above 2400 m, H. depressus below 1200 m).

Diet

of various . of (Acanthoscelides, Zabrotes, Bruchus, Mimosestes, Pseudopachymeria, Stator) within legume seeds; parasitoids of (Adetus analis); parasitoid of (Liturgusa maya); of (Cotesia invirae) in lepidopteran ; and potential hyperparasitoid of congeneric Horismenus .

Host Associations

  • Acanthoscelides obvelatus - for H. butcheri and H. missouriensis
  • Acanthoscelides obtectus - for H. depressus
  • Zabrotes subfasciatus - for H. depressus
  • Adetus analis - for two new Brazilian
  • Liturgusa maya - for H. liturgusae
  • Cotesia invirae - for H. camobiensis
  • Opsiphanes invirae - indirectlepidopteran of Cotesia invirae, indirect host for H. camobiensis
  • Phaseolus vulgaris - common bean
  • Phaseolus coccineus - scarlet runner bean
  • Phaseolus lunatus - lima bean
  • Pithecellobium dulce - Brazilian for three new
  • Pereskia aculeata - ornamental cactus, in Africa
  • Sechium edule - minor in Brazil, Argentina, USA

Behavior

Several exhibit : H. abnormicaulis may act as hyperparasitoid on other Horismenus species; H. camobiensis is a confirmed hyperparasitoid of Cotesia invirae. H. depressus typically dominates where present, though shows partitioning (rarely emerges from P. coccineus despite sympatry with P. vulgaris). H. missouriensis shows restricted use, not extending into P. vulgaris in sympatry with P. lunatus. endosymbionts detected in H. missouriensis, potentially obscuring mitochondrial population structure.

Ecological Role

agents of agricultural and forest pests, particularly that damage stored legumes. within multitrophic systems involving wild and domesticated beans, their bruchid , and higher . contribute to complex dynamics in tropical and subtropical .

Human Relevance

Evaluated as potential agents for and Pachnaeus litus (citrus ) in Belize; investigated for control of pests in bean systems; surveyed for biological control of Pereskia in Africa.

Similar Taxa

  • H. depressus / H. depressoidesH. depressoides described as distinct from H. depressus based on morphological differences, though previously misidentified
  • H. missouriensis / H. statorH. stator described as similar to H. missouriensis, requiring careful morphological examination
  • H. butcheri / H. dennoi / H. multistriatusH. dennoi and H. multistriatus both similar to H. butcheri, distinguished by subtle morphological characters

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