Pleocoma rickseckeri
Horn, 1888
rain beetle
Pleocoma rickseckeri is a of rain beetle in the Pleocomidae, a group of scarab beetles to western North America. The species was described by George Henry Horn in 1888 and named in honor of Lucius Edgar Ricksecker, an entomologist who collected in the western United States. Like other Pleocoma species, it is adapted to Mediterranean climates with winter rainfall. are active during the rainy season, with males flying in search of females.
Pronunciation
How to pronounce Pleocoma rickseckeri: /ˌpliːəˈkoʊmə rɪkˈsɛkəraɪ/
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Identification
Members of Pleocoma can be distinguished from other scarab beetles by their extremely (burrowing) adaptations, including broad, shovel-like forelegs and dense setae. Males have fully developed wings and fly during rain events, while females are flightless with reduced, non-functional wings. Specific identification of P. rickseckeri requires examination of male genitalia and comparison with other Pleocoma , which are morphologically similar and geographically overlapping.
Habitat
Chaparral and oak woodland in Mediterranean climate zones, with well-drained soils suitable for burrowing. emerge during winter rainfall events.
Distribution
to California, United States. Records indicate presence in central and northern California within the Nearctic region.
Seasonality
are active during the winter rainy season, typically November through March, with peak activity correlated with rainfall events. This seasonal pattern is characteristic of the and reflects to Mediterranean climate regimes.
Life Cycle
The is incompletely known but follows the pattern of other Pleocoma : larvae are presumed to be soil-dwelling and feed on decaying organic matter or roots over multiple years. occurs in soil chambers. emerge with the onset of winter rains, with males flying to locate flightless females. Mating occurs at or near the female burrow.
Behavior
Males fly during rainfall, often in large numbers, making them conspicuous despite their otherwise cryptic habits. Females remain in burrows near the soil surface and release to attract males. Both sexes are primarily .
Ecological Role
As burrowing insects, Pleocoma contribute to soil aeration and nutrient mixing. Larval feeding on organic matter may influence soil decomposition processes. serve as prey for vertebrate during their brief above-ground activity period.
Human Relevance
The eponym honors Lucius Edgar Ricksecker, recognizing contributions to western American entomology. Rain beetles occasionally attract public attention due to the conspicuous mass of males during winter storms.
Similar Taxa
- Other Pleocoma speciesApproximately 30 of Pleocoma occur in western North America, many with overlapping ranges in California. Accurate identification requires male genitalia examination and geographic data.
More Details
Etymology
The specific epithet rickseckeri honors Lucius Edgar Ricksecker (1851-1916), an American entomologist who collected extensively in the western United States and contributed specimens to the United States National Museum.
Rain beetle biology
The 'rain beetle' refers to the of in response to winter rainfall. This trait is shared across the Pleocomidae and represents an to regions with hot, dry summers and cool, wet winters.