Plecia americana
Hardy, 1940
American Lovebug
Plecia americana, commonly known as the , is a of in the . This species is part of a known for conspicuous mating where males and females remain conjoined in copula for extended periods, often flying together as a pair. are small with distinctive in . The species is known from the southeastern United States, where adults emerge in seasonal swarms.
Pronunciation
How to pronounce Plecia americana: //ˈpliːʃə əˌmɛrɪˈkɑːnə//
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Identification
Distinguished from other by the combination of red with black body and , and the characteristic paired posture during mating. Males of Plecia can be separated from Bibio by the absence of the stout, downcurved on the fore that are diagnostic for Bibio. Plecia americana is geographically separated from the more widespread (), which occurs primarily in Florida and Gulf states; P. americana has a more northerly distribution in the eastern United States.
Images
Habitat
occur in open areas where swarming and mating take place. Larval stages develop in soil rich in decaying matter, including compost, manure, and decaying material.
Distribution
Southeastern United States, with records from states along the Atlantic coast and inland areas. Distribution extends north of the primary range of .
Seasonality
emerge in spring and fall, forming conspicuous swarms during these periods. The phenomenon is short-lived, lasting only a few weeks per .
Life Cycle
Females use foreleg to dig into soil several inches deep to in masses of 200–300. feed on decaying matter in soil, manure, and compost, and may feed on roots of grasses and herbs. Mature larvae likely overwinter, pupating in early spring. lifespan is brief, estimated at 2–3 days.
Behavior
Males and females mate in and remain conjoined for hours to days, a that gives the "." Prolonged copulation and post-copulatory guarding by males is hypothesized to prevent rival males from accessing the female and ensure paternity. Males form aggregative swarms that attract females for mate selection.
Ecological Role
function as , breaking down decaying material and matter in soils. This role contributes to . Occasional feeding on grass and herb roots may result in minor agricultural impact, though this is not well documented for this specifically.
Human Relevance
do not bite or and pose no direct health threat. Seasonal swarms can create nuisance conditions: large numbers splatter on vehicle windshields creating hazardous driving conditions, and may clog automobile radiators causing overheating. Adults may enter homes and gardens in large numbers during peak periods.
Similar Taxa
- Plecia nearcticaShares the "" and nearly identical appearance and mating , but occurs primarily in Florida and Gulf Coast states rather than the more northerly Atlantic distribution of P. americana.
- Bibio spp.Other in the same , but males have distinctive stout, downcurved on the fore used for digging, and generally lack the red thoracic coloration seen in Plecia.
- Dilophus spp.Related with rings of short on forelegs rather than long , usually smaller and often reddish rather than black with red .
More Details
Taxonomic note
The Plecia contains two in the United States: P. americana and P. nearctica. The latter is more widely known as the "" due to its abundance in Florida, but P. americana shares the same in parts of its range.