Phyllophaga subtonsa
(LeConte, 1856)
May beetle, June beetle
subtonsa is a of in the . Like other members of the , it is characterized by activity and larval development as in soil, feeding on roots. The species is found in the eastern and central United States. Adults are attracted to lights and are most active during late spring and early summer. The genus Phyllophaga is one of the most species-rich in North America, with over 400 species, making species-level identification often difficult without examination of .
Pronunciation
How to pronounce Phyllophaga subtonsa: /ˌfaɪloʊˈfeɪɡə ˌsʌbˈtɒnsə/
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Identification
identification within typically requires examination of male and female . P. subtonsa can be distinguished from similar species by subtle morphological characters, though specific diagnostic features for this species are not well documented in readily accessible literature. are generally to black, , and oval in shape, with (fan-like) . The and may show subtle surface sculpturing or setation patterns that aid in identification.
Distribution
Eastern and central United States. GBIF records indicate presence in Alabama, Georgia, Indiana, Maryland, Mississippi, New York, Tennessee, Virginia, and Wisconsin.
Seasonality
are active primarily in late spring through early summer (May-June), typical for the . are present in soil year-round, with development spanning multiple seasons.
Diet
feed on roots of grasses and other plants in soil. feed on foliage and flowers of various plants, though specific records for this are limited.
Life Cycle
with , , , and stages. Larvae are the familiar "" that develop in soil over one to three years depending on and latitude. Adults emerge, mate, and females oviposit in soil. The specific developmental duration for P. subtonsa has not been documented.
Behavior
are and attracted to lights. Males use their to detect female . Both sexes may be found on vegetation at night, though they are primarily ground-dwelling or found on low vegetation.
Ecological Role
function as root-feeding / in soil , contributing to and soil aeration. serve as and for various vertebrate and . The is part of the supporting in , Thynnidae, and .
Human Relevance
in the are occasionally pests of agricultural and turfgrass when larval are high. Specific economic impact data for P. subtonsa is not documented, though the is presumably of minor importance compared to more abundant .
Similar Taxa
- Phyllophaga cribrosaBoth are flightless with similar body forms, but P. cribrosa is easily distinguished by its oval, convex shape, black coloration, cribrose (sieve-like) surface texture, and distinct longitudinal elytral furrows. P. cribrosa is restricted to Oklahoma and Texas, while P. subtonsa occurs further east.
- Polyphylla speciesPolyphylla (lined ) are larger, chunkier with strikingly enlarged, fan-like in males. They are primarily sand-dune in the western and southwestern U.S., whereas P. subtonsa is more broadly distributed in eastern deciduous forest and grassland .
More Details
Taxonomic complexity
The contains over 400 in North America, making it one of the most species-rich genera in the fauna. Species boundaries are often subtle and require knowledge to discern. Many species remain poorly known biologically, with females of some species still undescribed or unknown.
Parasitoid associations
of , including presumably P. subtonsa, are for several lineages. The Wasp (Pelecinus polyturator) is a well-known parasitoid of Phyllophaga grubs, as are members of the wasp Myzinum and Myzine ( Thynnidae/).