Valley Carpenter Bee

Xylocopa sonorina

Classification

Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Hymenoptera
Family: Apidae
Subfamily: Xylocopinae
Genus: Xylocopa
Species: sonorina

Pronunciation

How to pronounce Xylocopa sonorina: //zɪˈlɒkəpə səˈnɔrɪnə//

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Summary

Xylocopa sonorina, known as the Valley Carpenter Bee, is a large species of carpenter bee found in the southwestern United States and Hawaii. Males have distinctive coloration while females are black. They create nests in wood, prefer unpainted surfaces, and their foraging methods can impact flowering plants.

Physical Characteristics

Males are golden-brown with green eyes, while females are black with brassy reflections. They grow up to around 18-26 mm (about 0.7-1 inch) in length, making them some of the largest bees found in California and Hawaii. The Valley Carpenter Bee's egg can be 15mm long, which is among the largest of all insect eggs.

Identification Tips

No other Xylocopa species is as sexually dimorphic as X. sonorina; males are brightly colored and come with distinct pheromone-producing glands that attract females.

Habitat

Primarily found in valleys and foothills with deciduous trees such as oaks.

Distribution

Occurs from western Texas to northern California, including the eastern Pacific islands, and introduced to the Hawaiian Islands.

Diet

Adult bees presumably take some pollen; however, they often 'steal' nectar from flowers by slitting the base of corollas instead of pollinating them.

Life Cycle

In spring, females mate and can either disperse to start new nests or clean out old tunnels. They prepare their nesting tunnels made from wood and provide provisions for their larvae in the form of 'bee bread', which is a mixture of pollen and nectar.

Reproduction

Female lays eggs on pollen balls in sealed chambers created in her excavated wooden nests. Each egg is deposited in a separate cell lined with wood shavings. Young adults hibernate in the tunnels during winter.

Ecosystem Role

Sharers of crucial pollination interactions for specific plants; however, nests in wood can cause structural damage leading to them being considered pests.

Cultural Significance

In Hawaii, X. sonorina has been utilized in tropical agriculture as an important pollinator for passion fruit (Passiflora edulis).

Evolution

Originally described from specimens collected in Hawaii in 1874, previously misidentified as coming from the Sunda Islands until 1956. It has undergone taxonomic changes with reclassification of synonyms based on DNA analysis.

Similar Taxa

Misconceptions

Males do not have stingers; they may appear aggressive but are typically less aggressive than females among bees. Furthermore, their behavior of 'nectar stealing’ does not involve pollination, which may lead to misunderstandings about their role in the ecosystem.