Melissodes

Latreille, 1829

long-horned bees

Species Guides

21

Melissodes is a large of long-horned bees in the tribe Eucerini, with approximately 129-140 described native to the Americas. Males are named for their characteristically long that extend well beyond the . The genus exhibits diverse pollen specialization strategies, with females ranging from polylectic to oligolectic, particularly on Asteraceae. Species are economically important as crop , especially for sunflower.

Melissodes tristis by (c) Catherine C. Galley, some rights reserved (CC BY), uploaded by Catherine C. Galley. Used under a CC-BY license.Melissodes bimaculatus by (c) eamonccorbett, some rights reserved (CC BY), uploaded by eamonccorbett. Used under a CC-BY license.Melissodes desponsus by (c) Amy Schnebelin, some rights reserved (CC BY), uploaded by Amy Schnebelin. Used under a CC-BY license.

Pronunciation

How to pronounce Melissodes: /mɛˈlɪsədiːz/

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

Identification

Melissodes are medium-sized bees with dense, long hairs on the mesosoma/ and pale hair bands along the metasoma in most species. Males possess exceptionally long extending well beyond the back of the . A distinguishing feature is anteriorly narrowed tegulae. Species-level identification is difficult due to morphological similarity among closely related . Distinguished from the related Svastra by subtle morphological differences.

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Habitat

Most commonly found in open and edge environments, particularly in western North America, with high floral abundance and sandy to loamy soils suitable for nesting. frequently occur in areas with exposed, sandy soil. Agricultural landscapes including crop field margins, grasslands, pastures, and forage crops. Some subgenera (Melissodes s.s. and Ecplectica) occur across North and South America, while remaining subgenera are restricted to North America.

Distribution

Native to the Americas from Canada to Argentina, though less common in tropical regions. Eight subgenera recognized: Eumelissodes, Melissodes s.s., Ecplectica, Tachymelissodes, Psilomelissodes, Heliomelissodes, Apomelissodes, and Callimelissodes. Subgenera Melissodes s.s. and Ecplectica have transcontinental distributions; other subgenera are North American endemics.

Seasonality

Males generally emerge from nests prior to females each year. Activity patterns vary by and region. In Brazilian Cerrado, male sleeping of M. nigroaenea observed during dry season (May-September).

Diet

Females collect nectar and pollen. Most are either polylectic (diverse plant sources) or oligolectic (narrow range of related plants), with Asteraceae being the predominant pollen source for oligolectic species. Some species specialize on Clarkia, Polemoniaceae, or Pontederia. Observed on crops including sunflower, canola, cantaloupe, watermelon, cotton, coffee, and alfalfa.

Life Cycle

Females are solitary or gregarious ground-nesters. Nests consist of burrows in sandy or loamy soil, either with single or multiple cells per burrow. Nest entrances are round holes approximately pencil-diameter, sometimes with small soil piles resembling mini-volcanoes. Nests commonly parasitized by cuckoo bees in the Triepeolus.

Behavior

Males exhibit sleeping on flowers, stems, or branches at night, arriving before sunset and remaining until after sunrise. Aggregations range from a few to several dozen individuals and may persist across at the same location. Males display territorial defense of floral resources, dive-bombing other including butterflies and other bees. Males fly erratically and engage in jostling for position at sleeping sites. Foraging females of some use rapid abdominal tapping motion to collect pollen from sunflowers.

Ecological Role

Important native in agricultural and natural . Significant pollinators of sunflower and other crops. Contribute to pollination services alongside managed honey bees in agricultural landscapes. Part of diverse native in North and South American ecosystems.

Human Relevance

Economically valuable as crop , particularly for sunflower production. Subject of pollinator conservation efforts and research on native . Frequently observed and photographed in pollinator gardens. Male sleeping are notable phenomena for natural history observation.

Similar Taxa

  • SvastraSister believed to share common ancestry based on morphological and molecular evidence; difficult to distinguish by alone; both are long-horned bees in tribe Eucerini with males exhibiting similar sleeping
  • TriepeolusCuckoo bee that parasitizes Melissodes nests; females may be mistaken for Melissodes but are rather than nest builders

More Details

Taxonomic history

Eight subgenera originally recognized by Wallace E. LaBerge based on morphological characters. Believed to be sister to Svastra based on shared morphological features and molecular evidence.

Male-female behavioral dichotomy

Males cannot sting (lack modified ovipositor/stinger). Male sleeping are based on suitable perches rather than proximity to female nests, though typically within 100 yards. Females nest underground and do not participate in sleeping aggregations.

Foraging ecology

M. desponsa foraging females are reproductive (unlike foragers), visit numerous floral in single foraging trips, and do not show high forage fidelity or mass recruitment to abundant resources.

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Sources and further reading