The Sepsidae are a family of flies, commonly called the black scavenger flies or ensign flies. Over 300 species are described worldwide. They are usually found around dung or decaying plant and animal material. Many species resemble ants, having a "waist" and glossy black body. Many Sepsidae have a curious wing-waving habit made more apparent by dark patches at the wing end.
Many species have a very wide distribution, reflecting the coprophagous habit of most Sepsidae. Some species have been spread over large territories in association with livestock. Adult flies are found mostly on mammal excrement, including that of humans (less often on other rotting organic matter), where eggs are laid and larvae develop, and on nearby vegetation, carrion, fermenting tree sap, and shrubs and herbs.
Many Sepsidae apparently play an important biological role as decomposers of mammal and other animal excrement. Some species may have a limited hygienic importance because of their association with human feces. Others are useful tools in forensic entomology.
|Sepsis fulgens (lesser dung fly)|
For terms, see Morphology of Diptera.
Sepsids are slender flies that resemble minute, winged ants. They are usually black in color, sometimes lustrous, and sometimes with silvery hairs on the thorax. The head is rounded. Sepsids have one or more bristles at the posteroventral margin of the posterior spiracle of the thorax, a character that distinguishes the family from other acalyptrates. The postvertical bristles are divergent or somtetimes absent. Up to three pairs of frontal bristles are seen. They have ocelli with ocellar bristles. Vibrissae and palpi are poorly developed. The front legs of the male often have extrusions, spurs, teeth, or other ornamentation. The tibia has a dorsal preapical bristle in most genera. The abdomen is usually constricted in the basal part.
The larva is slender, tapering at the front end, and smooth except for ventral creeping welts. The larva is amphipneustic: it has two pairs of spiracles, one toward the head and one at the tail. The bulbous posterior end with its pair of spiracles distinguishes it from the larvae of other acalyptrates.
The pupa is enclosed within a puparium.
The Acalyptratae or Acalyptrata are a subsection of the Schizophora, which are a section of the order Diptera, the "true flies". In various contexts the Acalyptratae also are referred to informally as the acalyptrate muscoids, or acalyptrates, as opposed to the Calyptratae. All forms of the name refer to the lack of calypters in the members of this subsection of flies. An alternative name, Acalypterae is current, though in minority usage. It was first used by Justin Pierre Marie Macquart in 1835 for a section of his tribe Muscides; he used it to refer to all acalyptrates plus scathophagids and phorids, but excluding Conopidae.
The confusing forms of the names stem from their first usage; Acalyptratae and Acalyptrata actually are adjectival forms in New Latin. They were coined in the mid 19th century in contexts such as "Muscae Calyptratae and Acalyptratae" and "Diptera Acalyptrata", and the forms stuck.The Acalyptratae are a large assemblage, exhibiting very diverse habits, with one notable and perhaps surprising exception: no known acalyptrates are obligate blood-feeders (hematophagous), though blood feeding at various stages of the life history is common throughout other Dipteran sections.Nemopoda
Nemopoda is a genus of flies belonging to the family Sepsidae.Nemopoda nitidula
Nemopoda nitidula is a European species of flies and member of the family Sepsidae.Orygma luctuosum
Orygma luctuosum is a European species of flies and member of the family Sepsidae.Rasmus Carl Staeger
Rasmus Carl Staeger (1800–1875) was a Danish entomologist.
Staeger was born and died in Copenhagen, over the course of his life serving as a judge, financial advisor to the Danish government, and entomologist, focusing on Diptera. His foci were Dolichopodidae, Sepsidae and Chironomidae.Saltella
Saltella is a genus of flies in the family Sepsidae.Saltella sphondylii
Saltella sphondylii is a European species of flies and member of the family Sepsidae.Sciomyzoidea
Sciomyzoidea is a superfamily of Acalyptratae flies.
The families placed here are:
Coelopidae – seaweed flies
Sepsidae – scavenger flies
Sciomyzidae – marsh flies, snail-killing flies (including Huttoninidae, Phaeomyiidae, Tetanoceridae)Sepsis (fly)
Sepsis is a genus of flies in the family Sepsidae.Sepsis cynipsea
Sepsis cynipsea is a European species of flies and member of the family Sepsidae.Sepsis flavimana
Sepsis flavimana is a European species of flies and member of the family Sepsidae.Sepsis fulgens
Sepsis fulgens is a small ant-mimicking fly sometimes called the "lesser dung fly", though this can also refer to any member of the distantly related fly family Sphaeroceridae.Sepsis nigripes
Sepsis nigripes is a European species of flies and member of the family Sepsidae.Sepsis punctum
Sepsis punctum is a European species of flies and member of the family Sepsidae.Sepsis violacea
Sepsis violacea is a European species of flies and member of the family Sepsidae.Themira
Themira is a genus of flies in the family Sepsidae.Themira annulipes
Themira annulipes is a European species of fly and member of the family Sepsidae.Themira nigricornis
Themira nigricornis is a species of black scavenger fly in the family Sepsidae.Themira putris
Themira putris is a European species of fly and member of the family Sepsidae.
Extant Diptera families