Odynerus

Latreille, 1802

potter wasps, mason wasps

Species Guides

Odynerus is a primarily Holarctic of potter wasps in the Eumeninae. The genus has been widely used as a root for constructing names of other potter wasp genera with non-petiolated metasoma, including Euodynerus, Acarodynerus, Stenodynerus, Parodontodynerus, and Incodynerus. within this genus are solitary that construct nests using mud or soil, often with distinctive turrets or chimneys. The genus contains hundreds of species, with Odynerus spinipes being particularly notable for exhibiting exceptional intrasexual cuticular hydrocarbon dimorphism in females.

Odynerus by (c) Kostas Zontanos, some rights reserved (CC BY), uploaded by Kostas Zontanos. Used under a CC-BY license.

Pronunciation

How to pronounce Odynerus: /oʊˈdaɪ.nɛr.əs/

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Habitat

Nesting sites vary by : some utilize pre-existing cavities such as borings in wood, hollow plant stems, or crevices in walls; others construct free-standing mud nests on exposed surfaces including twigs, rocks, or walls; some excavate vertical burrows in horizontal ground surfaces surmounted by turrets. Species nesting in soil often favor situations close to water, using regurgitated water to soften soil during construction.

Distribution

Primarily Holarctic; recorded from Denmark, Norway, Sweden, Germany (Kaiserstuhl region), Ukraine (Crimea), Canada (Alberta, British Columbia, Saskatchewan, Ontario), and the United States. The has a Palearctic distribution with some extending into the Nearctic.

Diet

Predatory; provisions nests with larvae of curculionid beetles ( Hypera), weevil larvae (Phytonomus), and caterpillars from including Crambidae, Pyralidae, and Noctuidae. Prey is typically weakly paralyzed, with some larvae remaining ambulatory.

Host Associations

Hypera postica - -preyalfalfa weevil larvae provisioned as prey in Alberta and Utah
Phytonomus - -preyweevil larvae carried as prey by O. reniformis
Loxostege - -preycaterpillars recorded as major for some

Life Cycle

Solitary nesting; females construct nests and provision individually. Nests typically contain 1-10 cells depending on . Females lay a single suspended from a short thread attached to the cell wall before stocking with prey. Larvae feed on provisioned prey, then pupate. Completed nests are sealed with mud, sometimes using demolished turret material.

Behavior

Females exhibit advanced parental care through nest construction and provisioning. Some practice . Nest construction involves building distinctive turrets or chimneys from mud pellets; turret shape varies by species (curved and sideward-opening versus straight and upward-opening). Females have been observed to deconstruct turrets entirely when sealing nests, making entrances nearly invisible. Some species exhibit gregarious nesting, with multiple females nesting in close proximity. Males of some species actively dig to reach pre-emergent females and may form sleeping clusters.

Ecological Role

of agricultural pests including alfalfa weevil; potential agent in programs. As solitary , they contribute to regulation of herbivorous insect through larval provisioning.

Human Relevance

Studied for potential against alfalfa weevil (Hypera postica). Some may be confused with common such as Euodynerus hidalgo, requiring careful identification for monitoring purposes.

Similar Taxa

EuodynerusFormerly classified under Odynerus; distinguished by non-petiolated metasoma and other structural features
StenodynerusDerived name from Odynerus root; shares non-petiolated metasoma characteristic
Euodynerus hidalgoSimilar appearance but with more angulate propodeum and clear, reflexed hind margins on first and second tergites

More Details

Chemotype dimorphism

Odynerus spinipes exhibits exceptional intrasexual cuticular hydrocarbon (CHC) dimorphism, with females expressing one of two distinct chemotypes. This dimorphism appears to have evolved in response to cleptoparasitic pressure from cuckoo wasps (Chrysididae), which mimic CHC profiles to evade detection.

Taxonomic influence

The name Odynerus has been extraordinarily influential in potter wasp , serving as the root for numerous derived genus names indicating non-petiolated metasoma .