Pleocoma marquai
Hovore, 1972
rain beetle
Pleocoma marquai is a of rain beetle described by Hovore in 1972. It belongs to the Pleocomidae, a small group of scarab beetles known for their during autumn rains. The species is known from California and is one of approximately 30 species in the Pleocoma.
Pronunciation
How to pronounce Pleocoma marquai: //ˌpliːəˈkoʊmə ˈmɑrkwaɪ//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
As a member of Pleocoma, P. marquai likely exhibits the characteristic robust, cylindrical body form and densely hairy typical of rain beetles. Males have strongly bipectinate (feathery) , while females have reduced antennae and are flightless. Specific diagnostic features distinguishing P. marquai from are not documented in available sources.
Habitat
California; associated with sandy or friable soils where larvae develop. Rain beetles typically inhabit chaparral, oak woodland, and coniferous forest in coastal and montane regions.
Distribution
Known from California, USA. GBIF records indicate presence in the Nearctic region with specific locality in California.
Seasonality
emerge during autumn rains, typically October through December, coinciding with the first significant rainfall events of the season.
Diet
Larvae feed on roots of woody plants; specific records for P. marquai are not documented. do not feed.
Life Cycle
Complete with extended larval development. Larvae live underground, feeding on plant roots for several years (reported as 7-13 years in related Pleocoma ). occurs in soil . emerge synchronously with autumn rainfall, mate, and females oviposit in soil burrows.
Behavior
Males fly during rainy evenings, often in large , seeking flightless females at soil burrow entrances. Females remain in or near burrows, releasing to attract males. Both sexes are active primarily during precipitation events.
Ecological Role
Larvae are root-feeders that may influence plant composition through belowground herbivory. serve as food for vertebrate during brief seasonal periods.
Human Relevance
Limited direct interaction with humans. The synchronous makes conspicuous during autumn rains, occasionally attracting attention from naturalists. Larval root-feeding may occasionally impact ornamental plantings or young trees, though this is not documented specifically for P. marquai.
Similar Taxa
- Pleocoma speciesAll share flightless females, autumn during rains, and feathery male . Distinguishing P. marquai requires examination of male genitalia and specific setal patterns on the , features not reliably observable without dissection.
- Other ScarabaeoideaRain beetles are distinguished from other scarabs by the combination of autumn rain-triggered , sexually dimorphic (strongly pectinate in males, reduced in females), and dense thoracic .