Alaus zunianus

Distinguished from Alaus oculatus (Eyed Elater) by rounder eyespots and ivory/beige mottling versus stark white. Distinguished from A. myops (Blind Click Beetle) by much larger, more prominent eyespots. Distinguished from A. lusciosus (Texas Click Beetle) by geographic range—A. zunianus appears confined to Arizona while A. lusciosus ranges from Texas to southern Colorado, Oklahoma, and Kansas. The robust body build is more pronounced than in other eyed elater species.

Large, robust beetle with prominent false eyespots on the pronotum. Eyespots are rounder than in other Alaus species, surrounded by black and white pubescence. Body mottled with ivory or beige coloration rather than stark white. Adults measure approximately 20-35 mm in length. The body is bullet-shaped and covered with soft pubescence that provides cryptic coloration against tree bark. True compound eyes are small and located on the head anterior to the false eyespots.

Associated with pine forests and wooded areas. Adults found on logs, stumps, and tree trunks. Larvae inhabit decaying wood beneath bark of fallen trees.

Appears confined to Arizona, United States. Range does not overlap with A. lusciosus or A. melanops.

Adults active during late spring and summer, primarily June and July. Some adults may overwinter in cavities in rotten wood and can be encountered year-round.

Larvae are elongate, cylindrical 'wireworms' that live in decaying wood beneath bark. They are predatory, feeding on larvae and pupae of other beetles. Larvae possess powerful jaws. After completing juvenile development, larvae pupate and emerge as adults.

Adults exhibit thanatosis (playing dead) when disturbed, lying still with legs and antennae appressed to the body. When grasped, they produce an audible click by snapping a prosternal spine into a mesosternal groove, which can propel the beetle into the air to escape predators or right itself if flipped onto its back. The clicking mechanism generates acceleration exceeding 2,000 m/s². Adults are strong fliers but appear less agile on foot. They are cryptic when motionless on bark.

Larvae function as predators in the decomposer food web beneath bark of fallen trees, controlling populations of other saproxylic insect larvae. Adults likely contribute to nutrient cycling in forest ecosystems.

Generally harmless to humans. Occasionally encountered by entomologists and naturalists in Arizona. Subject of research interest for chemical ecology and pheromone studies. Not considered an agricultural or structural pest.

• Alaus oculatusLarger eyespots with stark white mottling versus ivory/beige; eyespots less round; found throughout eastern North America rather than Arizona
• Alaus lusciosusNearly identical in appearance but ranges from Texas to southern Colorado, Oklahoma, and Kansas with no range overlap
• Alaus myopsMuch smaller eyespots, mostly slate gray coloration, found in southern pine forests from Quebec to Florida and west to Manitoba, Minnesota, Kansas, and Texas
• Alaus melanopsWestern Eyed Click Beetle found in British Columbia, Oregon, Colorado, California, and New Mexico; resembles A. myops but ranges do not overlap

The prominent eyespots are false eyespots (ocelli) used for predator deterrence, not true eyes. The actual compound eyes are small and located on the head. The beetle cannot control the force of its click or its body orientation during jumping, resulting in approximately 50% probability of landing upright.

• click beetle
• eyed elater
• defensive eyespots
• thanatosis
• jumping mechanism
• Arizona endemic
• forest predator
• saproxylic

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Bug Eric: Eyed Elaters
• Finding Pheromones: How One Entomologist Puts Discoveries to Work in Pest Management
• Barking up the right tree for the eyed elater, Alaus oculatus — Bug of the Week
• Pop! goes the beetle | Beetles In The Bush
• Archive — Bug of the Week