Palpada albifrons
(Wiedemann, 1830)
White-faced Plushback
Palpada albifrons is a rare of () characterized by its distinctive -faced appearance and aquatic larval stage. are -sized commonly found on flowers, where they feed on nectar and pollen. The species has a disjunct distribution, occurring from Mexico northward along coastal areas of the United States, with additional records from South America. The are aquatic rat-tailed that inhabit -rich standing water.
Pronunciation
How to pronounce Palpada albifrons: /pælˈpɑːdə ælbiˈfrɒnz/
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Identification
Distinguished from similar Palpada and Eristalis by the combination of: -pollinose with thick white ; distinct grayish thoracic with oblique spots; with black base; and specific with R1 and curved R4+5. The abdominal pattern, particularly the confluent reddish-yellow spots on the third and the interrupted on the fourth segment, aids identification. Male and female dichoptic eyes with distinct thoracic banding pattern provide additional diagnostic characters.
Images
Appearance
Length 8–9 mm. covered with dense pollen and thick white , most conspicuous on frontal triangle; facial stripe and black. pilose, in males. obscurely reddish- with bare . with yellowish-white pile anteriorly, intermixed with blackish pile posteriorly; distinct grayish pollinose broad to , with oblique spot on each side reaching from base toward . Scutellum with narrowly black base and black pile. with complex pattern: first black with yellow outer angles; second segment light yellow with narrow opaque black stripe; third segment with oval reddish-yellow spots confluent with preceding yellow; fourth segment with yellow hind border and narrow interrupted shining . Wings , sometimes faintly clouded; R1 ; R2+3 with distinct curvature into submarginal cell near end of ; R4+5 curved. Legs black; hind dilated; joints and portions of light yellow; middle light yellow; extreme base of anterior metatarsi with greenish tinge.
Habitat
occur in flower-rich including gardens, meadows, and coastal areas. inhabit aquatic environments, specifically -rich standing water such as putrid water, saturated organic matter, and water- containers.
Distribution
Mexico northward along coastal areas of the United States. GBIF records indicate additional occurrence in Brazil (Acre, Amazonas, Amapá, Distrito Federal, Espírito Santo, Goiás, Minas Gerais, Mato Grosso do Sul, Mato Grosso, Pará, Paraná, Rio de Janeiro, Rondônia, Roraima, Rio Grande do Sul, Santa Catarina, São Paulo, Tocantins) and Colombia (Santander).
Diet
feed on nectar and pollen from flowers. are , consuming bacteria and other microbes from matter in water.
Life Cycle
. laid in or near aquatic . are aquatic rat-tailed with into an extensible breathing that connects to the water surface; they filter feed on microorganisms in -rich water. Mature larvae seek dry land to pupate; pupal capsule is hard and mouse-shaped. emerge from .
Behavior
are flower visitors and capable of nearly motionless hovering characteristic of . remain connected to water surface via breathing while filter feeding.
Ecological Role
serve as , transferring pollen while feeding on nectar. contribute to in aquatic by processing matter and microorganisms.
Human Relevance
are of wildflowers and cultivated plants. may occur in water gardens and containers, where they can be mistaken for mosquito larvae; they do not bite or transmit .
Similar Taxa
- Eristalis tenaxSimilar rat-tailed larval and flower-visiting ; distinguished by larger size, different facial coloration, and abdominal pattern lacking the distinct with black base.
- Palpada vinetorum with similar overall appearance; distinguished by differences in thoracic coloration and abdominal pattern details.
- Palpada furcata with overlapping distribution; distinguished by differences in and scutellar coloration.