Megalorchestia californiana

Distinguished from the congeneric Megalorchestia corniculata (short-horned beach hopper) by habitat preference: M. californiana occurs on slightly sloping sandy beaches and retreats far up the beach, while M. corniculata inhabits steeply sloping shores and remains lower on the beach. The red antennae of adults and larger size relative to some other beach hoppers aid identification.

Adults reach approximately 25 mm (about one inch) in length. The body is gray-white to ivory in color and typically semi-transparent, becoming opaque immediately prior to molting. Adult antennae are red, while juvenile antennae are orange.

Slightly sloping sandy beaches along ocean coastlines. Individuals retreat high up the beach, often burrowing in sand or sheltering under accumulations of dead seaweed during daylight hours.

Native to the west coast of North America, ranging from Vancouver Island, British Columbia, Canada to Laguna Beach, California, USA.

Feeds on decaying seaweed and organic debris, including material left by beach visitors.

Nocturnal forager, emerging at night or during dull weather to feed. Constructs shallow burrows or occupies existing shelters under seaweed. Males have been observed fighting for possession of existing burrows rather than excavating new ones. Retreats under sand before dawn.

Detritivore contributing to decomposition and nutrient cycling on sandy beaches. Consumes stranded marine vegetation and organic matter, facilitating breakdown and return of nutrients to coastal ecosystems.

Occasionally encountered by beachgoers; harmless to humans. May feed on organic debris left behind by visitors.

• Megalorchestia corniculataOverlapping geographic range and similar morphology; distinguished by habitat preference (steep vs. gentle beach slopes) and vertical distribution on beach (lower vs. higher intertidal)

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