Trichomyia

Haliday, 1839

moth flies

Species Guides

1

Trichomyia is the sole extant in the Trichomyiinae ( Psychodidae), a group of small moth flies with global distribution. The genus exhibits exceptional , particularly in the Neotropics and Australasian regions, with over 200 described across eight proposed subgenera. possess distinctive morphological features including a missing bridge, 13-14 flagellomeres, 3-4 segmented palpus, and oval wings with a single longitudinal between R2+3 and M1+2. Larvae are elongated and adapted for boring into decaying wood with robust . Taxonomic classification within the genus remains challenging due to high morphological variability and historically unresolved phylogenetic relationships.

Pronunciation

How to pronounce Trichomyia: /ˌtrɪkoʊˈmaɪə/

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Identification

Trichomyia can be distinguished from other Psychodidae by the absence of an bridge, 13-14 flagellomeres on the , and an oval wing with a single longitudinal located between R2+3 and M1+2. The palpus has 3-4 segments; with four clearly differentiated segments belong to informal 'Group A', while those with three segments or with two basal segments partially belong to 'Group B'. Male terminalia are rotated 180° due to torsion of abdominal segments 7 and 8. Females possess two spermathecae. Larvae are elongated with robust adapted for wood-boring, differing from other psychodid larvae.

Habitat

Larval stages develop in moist decaying wood of dead or dying trees, and within rot holes of living trees. are typically collected near these larval microhabitats. Collection methods include traps placed on woody substrates, direct collection of wood containing larvae, , and light traps within forest environments. Specific records indicate collection in wet, cloudy weather conditions.

Distribution

distribution across all continents except Antarctica. Highest occurs in the Neotropics (76 described ) and Australasian region (46 species), followed by the Palearctic (10 species), Oriental (6 species), Afrotropical (5 species), and Nearctic (5 species) regions. Documented from Atlantic Forest in Brazil, multiple states across Brazil (Amazonas, Pará, Bahia, Roraima, Rondônia, Minas Gerais), northern Queensland and eastern Australia, New Guinea, Mexico, and Italy.

Life Cycle

Larval development occurs in decaying wood; emerge from these substrates. Females possess a pair of spermathecae. No further details of developmental stages, -laying, or are documented.

Behavior

are typically active during late afternoon and evening hours. Wing posture at rest varies by : held horizontally over the in some species (e.g., T. urbica), or in an intermediate position between horizontal and roof-like in others (e.g., T. parvula, T. kviftei). Adults are attracted to light traps and can be collected from window surfaces and house walls near forested areas.

Ecological Role

Potential for forest condition; diminished abundance and in fire-disturbed versus undisturbed Atlantic Forest suggests sensitivity to environmental degradation and prolonged recovery time following disturbance. Larvae contribute to wood decomposition through boring activity in decaying timber.

Similar Taxa

  • PsychodinaeLarger of Psychodidae; Trichomyia differs in missing bridge, specific wing venation pattern with single longitudinal between R2+3 and M1+2, and 13-14 flagellomeres versus 14-16 in most Psychodinae
  • Phlebotominae containing sand flies; Trichomyia lacks the blood-feeding mouthparts and medical importance of phlebotomines, and shows different associations (wood-boring larvae versus soil or leaf litter)

Sources and further reading