Cacama valvata

Distinguished from other cicadas in its range by its strong association with cactus hosts (particularly cholla and prickly pear), its fast and wary flight behavior, and its distinctive loud, high-pitched metallic song. Males can be observed singing from cactus branches, often hanging upside down. The white, wax-coated ventral surface is an adaptation for thermoregulation in hot desert environments. Syntopic populations may occur with other cicada species such as Tibicen bifidus, from which it can be separated by habitat preference and song characteristics.

Medium to large-sized cicada. Adults have a white, wax-coated ventral surface that reflects intense desert heat. Wings are membranous with typical cicada venation. The body is robust, adapted for fast flight and agile maneuvering among cactus spines. Sexual dimorphism present: males possess tymbal organs for sound production; females have a well-developed ovipositor for inserting eggs into cactus stems.

Arid and semi-arid regions of the southwestern United States and northern Mexico. Specifically associated with cactus-dominated habitats including desert scrub, shortgrass prairie with cactus, and pinyon-juniper woodland with cactus understory. Occurs from low desert elevations up to pinyon-juniper zones at moderate elevations. Found in areas with abundant cholla (Cylindropuntia spp.) and prickly pear (Opuntia spp.) cacti.

North America: Arizona, California, Colorado, New Mexico, Oklahoma (northwestern), Texas. Central America: Chihuahua, Coahuila (Mexico). The species spans the southern Great Plains westward to California, with its distribution facilitated by the widespread occurrence of its cactus hosts.

Adults active during mid to late summer, typically June through August, coinciding with the hottest periods of the year. Nymphs live underground feeding on cactus roots for 3-7 years before emerging. Emergence occurs at night, with nymphs climbing vertical surfaces to molt. Eggs laid in late summer may overwinter in dry cactus stems, hatching after fall rains.

Nymphs feed on xylem sap from roots of cacti (primarily Opuntia and Cylindropuntia species). Adults feed on xylem sap from above-ground parts of host plants using piercing-sucking mouthparts.

• Cylindropuntia imbricata - hostCholla cactus; primary host for nymphal root-feeding and adult perching/oviposition
• Opuntia phaeacantha - hostBrown-spined prickly pear; host for nymphal feeding and adult activity
• Opuntia camanchica - hostTulip prickly pear; host for nymphal feeding and adult activity
• Opuntia australis - hostFlorida prickly pear; eastern host population
• Opuntia polyacantha - hostPlains prickly pear; host in northern range

Hemimetabolous development with three life stages: egg, nymph, adult. Eggs are inserted into dry, dead cactus stems by females. Nymphs hatch and burrow into soil, feeding on cactus roots for 3-7 years. Final instar nymphs emerge from soil at night, climb vertical surfaces, and molt to adults. Adults live for several weeks to months, feeding, mating, and laying eggs. Multiple cohorts are staggered in emergence, resulting in annual appearance of adults despite multi-year nymphal development.

Males produce loud, distinctive songs using tymbal organs to attract females. Singing typically occurs from perches on cactus branches, often hanging upside down to maximize sound projection and thermoregulate via the white, reflective ventral surface. Courtship involves males approaching females while singing, with song pattern changing from long wavering shrills to shorter sequences upon close approach, followed by leg touching and mounting. Adults are extremely fast-flying and alert, making them difficult to capture. They demonstrate remarkable ability to land on spiny cactus surfaces without injury. When disturbed, adults may walk backwards down branches or take rapid flight.

Herbivore feeding on cactus xylem sap; nymphal root-feeding and adult feeding contribute to nutrient cycling in arid ecosystems. Serves as prey for various predators including birds, cicada killer wasps (Sphecius grandis), and other insectivores. The massive emergences may provide predator satiation benefits. Parasitized by sarcophagid flies (Emblemasoma spp.) that affect male singing ability.

Subject of entomological study due to its remarkable cactus associations and thermal physiology. Its loud song is a characteristic sound of desert summers in the southwestern United States. Occasionally considered a nuisance due to noise, but causes no significant economic damage. Serves as an indicator species for healthy cactus-dominated desert ecosystems.

• Diceroprocta semicinctaSyntopic in some areas; occurs on mesquite rather than cactus; different song and habitat preference
• Diceroprocta texanaOccurs in similar regions; found on mesquite and other woody plants; lacks strong cactus association
• Tibicen bifidusSyntopic in some habitats; different thermal physiology and microhabitat use; less specialized cactus association
• Cacama mooreiCongener with similar ecology; may overlap in distribution but with different habitat preferences

• cicada
• cactus dodger
• desert insect
• thermoregulation
• acoustic communication
• cactus associate

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• Catalogue of Life
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• Comparative Thermal Physiological Ecology of Syntopic Populations ofCacama valvataandTibicen bifidus(Homoptera: Cicadidae): Modeling Fitness Consequences of Temperature Variation