Chrysina gloriosa

Distinguished from other Chrysina species by the combination of bright green ground color with distinct silver longitudinal elytral stripes. C. beyeri, which occurs sympatrically in some areas (e.g., Ramsey Canyon, Arizona), differs in color pattern and elytral markings. C. resplendens and other congeners typically lack the sharp silver striping or exhibit different base colors. The structural nature of the coloration—shifting with viewing angle—separates it from pigment-based green scarabs. Size range (20–30 mm) and association with juniper vegetation in sky island habitats provide additional diagnostic context.

Montane sky island ecosystems in the southwestern United States and northern Mexico. Adults strongly associated with juniper trees (Juniperus spp.) for feeding. Larval development occurs in decaying wood, specifically documented from Arizona sycamore (Platanus wrightii). Occurs at moderate to high elevations in mountain ranges that serve as Pleistocene refugia.

United States: southeastern Arizona, southern New Mexico, southwestern Texas (including Davis Mountains). Mexico: Chihuahua, Sonora, Coahuila. Distribution restricted to higher elevation mountain ranges; current range represents remnant populations from more widespread Pleistocene distribution.

Adults active June through August, with peak activity during summer monsoon season. Active both day and night. Strongly attracted to ultraviolet and mercury vapor lights, with peak attraction during first four hours after sundown (approximately 7:00 PM to 11:00 PM).

Adults feed primarily on juniper leaves (Juniperus spp.). Also visit flowers and act as incidental pollinators, transferring pollen while moving between blooms. Larvae feed on decaying wood of Arizona sycamore (Platanus wrightii).

• Juniperus spp. - adult food sourcePrimary adult host; foliage consumed
• Platanus wrightii - larval development substrateArizona sycamore decaying wood; larval food and habitat

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae develop in decaying wood. Specific duration of developmental stages not documented in available sources.

Adults climb vegetation to feed on foliage. Strong positive phototaxis to ultraviolet light sources, making them readily collected at light traps. Adults active both diurnally and nocturnally. When feeding on flowers, individuals transfer pollen incidentally between blooms. Flight activity documented during evening hours.

Herbivore feeding on juniper foliage. Incidental pollinator when visiting flowers. Larval stage contributes to wood decomposition in sycamore logs. Serves as prey for various vertebrate and invertebrate predators in sky island ecosystems.

Highly sought by professional and amateur collectors worldwide due to striking metallic coloration. Popular in insect collections and occasionally used in biological supply trade. Subject of scientific research on structural coloration and optical properties of biological materials. Genome sequenced to inform conservation decisions and population genetics studies. Sometimes incorrectly believed to be endangered; has never been formally assessed by IUCN or listed under U.S. Endangered Species Act. Can be locally abundant where habitat conditions are suitable.

• Chrysina beyeriOccurs sympatrically in some localities (e.g., Ramsey Canyon, Arizona); differs in elytral color pattern and markings
• Chrysina resplendensSimilar size and metallic appearance but lacks distinct silver striping on green background
• Other Chrysina speciesApproximately 100+ species in genus; many exhibit metallic coloration but differ in specific color pattern, geographic distribution, and host associations

Widely but incorrectly believed to have been officially recognized as endangered. The species has never been rated by IUCN or listed under the United States Endangered Species Act. This misconception may stem from its restricted range and high desirability among collectors creating perceived rarity.

• scarab
• jewel beetle
• structural coloration
• sky island
• juniper specialist
• nocturnal
• diurnal
• UV attraction
• southwestern US
• Mexico
• Rutelinae

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Sphecidae | Beetles In The Bush
• Party on a pin oak | Beetles In The Bush
• The gloriously dichromatic Dasymutilla gloriosa | Beetles In The Bush
• A reference quality genome assembly for the jewel scarab Chrysina gloriosa
• Angular distribution of luminescence dissymmetry observed from a random laser built upon the exocuticle of the scarab beetle Chrysina gloriosa