Okanagana

Identification to species requires examination of male genitalia, calling song characteristics, and geographic distribution. The genus can be distinguished from other North American cicada genera by combination of: 8 apical cells in forewing; male opercula typically not meeting medially; and specific timbal morphology. Molecular data (COI sequences) increasingly used for species delimitation. O. viridis is uniquely identifiable by its solid bright green coloration among Okanagana species. O. rimosa and O. canadensis are sympatric in some areas and distinguished by song structure and subtle morphological differences.

Predominantly associated with arid and cold-adapted environments in western North America, including grasslands, sagebrush steppe, pinyon-juniper woodlands, and montane forests. Some species occupy specialized habitats: O. monochroma is restricted to serpentine ecosystems in Northern California; O. viridis occurs in temperate deciduous forests of the southeastern United States near lowland river deltas; O. boweni is associated with the Walker Lane region of Nevada and California. Many species call from elevated perches in trees or shrubs.

Primarily western North America, from Alaska and Canada south through the western United States to Mexico. Notable eastern disjunct: O. viridis occurs in Arkansas, Louisiana, Mississippi, Tennessee, and Texas. Specific species distributions range from narrow endemics (O. monochroma with possibly the smallest geographic range of any North American cicada) to widespread species (O. rimosa, O. canadensis).

Adult activity generally occurs during spring and summer months, with timing varying by species and latitude. O. boweni has an early flight period (May and June). O. viridis is active during summer months. Many species exhibit protoperiodical emergence patterns with variable but often synchronized adult appearances in some years.

• Emblemasoma auditrix - parasitoidSarcophagid fly that parasitizes males of O. rimosa and O. canadensis; locates hosts by phonotaxis to calling songs; deposits larva directly into timbal organ.
• Massospora levispora - pathogenEntomopathogenic fungus specific to O. rimosa; produces conidia and resting spores; infected males lose sound-producing capability.
• Massospora cicadina - pathogenRelated entomopathogenic fungus; primarily infects periodical cicadas (Magicicada) but noted in comparative studies with O. rimosa infections.

Nymphal stages occur underground, feeding on xylem fluids from host plant roots. Duration of nymphal development varies by species; some exhibit protoperiodical patterns with extended but variable development times. Adults emerge, molt to winged form, and disperse to calling stations. Males produce acoustic signals to attract females; pair formation involves phonotaxis. Oviposition occurs in slits made in woody stems or branches. Egg hatch produces nymphs that drop to ground and burrow to root systems.

Males produce species-specific calling songs using tymbal organs; songs vary in pulse structure, frequency, and duration. O. viridis produces a thin, dull, steady whine approximately 30 seconds in duration with mean peak frequency of 9.27 kHz. O. rimosa and O. canadensis exhibit long-range acoustic signaling with associated predation/parasitism risk. Males of some species perch high in vegetation while calling. Weak defense behaviors against parasitoids include wing flapping, protest song production, and holding parasitoids with wings; O. canadensis shows stronger defense responses than O. rimosa.

Herbivores: nymphs and adults feed on xylem fluids, with minimal direct plant impact due to dilute nutrient content of xylem. Adults serve as prey for various predators including birds, reptiles, and mammals. Specialized host for acoustic-seeking parasitoids (Emblemasoma auditrix) and entomopathogenic fungi (Massospora levispora), representing notable examples of host-parasite coevolution involving acoustic communication. Emergence patterns may contribute to nutrient pulses in some ecosystems.

Subject of entomological research on acoustic communication, parasitoid-host interactions, and cicada biology. Some species of conservation concern due to restricted ranges and habitat specialization (e.g., O. monochroma, O. boweni). O. viridis listed as vulnerable in some jurisdictions due to habitat loss in remaining small forest patches. Not agricultural pests. Occasionally encountered by naturalists and photographers; songs contribute to summer soundscape in western North America.

• MagicicadaPeriodical cicadas with synchronized mass emergences; Okanagana species are often protoperiodical with more variable emergence timing and generally smaller body size. Magicicada species have 13- or 17-year life cycles with strict periodicity; Okanagana species typically have more flexible development.
• TibicenAnnual cicadas with overlapping generations and widespread eastern North American distribution; distinguished by different wing venation patterns, song characteristics, and typically larger body size in many species.
• BeameriaSmall prairie-dwelling cicadas; Beameria venosa is notably smaller (16 mm) than most Okanagana species and occupies Great Plains grasslands rather than western montane and arid regions.
• CicadettaSmall cicadas with similar habitat preferences in some regions; distinguished by morphological characters of male genitalia and different song characteristics.

• cicada
• acoustic communication
• parasitoid host
• western North America
• protoperiodical
• xylem feeder

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Cicadas: The World Awaits the Emergence of Brood X | Bug Squad
• North America’s smallest cicada | Beetles In The Bush
• MASSOSPORA LEVISPORA, A NEW SPECIES OF FUNGUS PATHOGENIC TO THE CICADA, OKANAGANA RIMOSA
• Infection behavior of a parasitoid fly, Emblemasoma auditrix, and its host cicada Okanagana rimosa
• Infection behavior of a parasitoid fly, Emblemasoma auditrix, and its host cicada Okanagana rimosa
• A new species of Okanagana native to a unique serpentine ecosystem in Northern California (Hemiptera: Auchenorrhyncha: Cicadidae)
• A new species of Okanagana from the Walker Lane region of Nevada and California (Hemiptera: Auchenorrhyncha: Cicadidae)
• Experimental infection of a periodical cicada (Magicicada cassinii) with a parasitoid (Emblemasoma auditrix) of a proto-periodical cicada (Okanagana rimosa)
• The Song, Morphology, Habitat, and Distribution of the Elusive North American Cicada Okanagana viridis (Auchenorrhyncha: Cicadidae)
• Efferia okanagana, a new species of robber fly (Diptera: Asilidae) from the grasslands of southern British Columbia, Canada, with notes on taxonomy, biology, distribution, and conservation status
• COLCONDAMYIA AUDITRIX NOV. SP. (DIPTERA: SARCOPHAGIDAE), A PARASITE WHICH IS ATTRACTED BY THE MATING SONG OF ITS HOST, OKANAGANA RIMOSA (HOMOPTERA: CICADIDAE)
• The Genus Massospora Entomopathogenic for Cicadas. Part. II. Biology of Massospora levispora and Its Host Okanagana rimosa, with Notes on Massospora cicadina on the Periodical Cicadas1,2,3
• Long-range Acoustical Signals, Phonotaxis, and Risk in the Sexual Pair-Forming Behaviors of <I>Okanagana canadensis</I> and <I>O. rimosa</I> (Hemiptera: Cicadidae)