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Genus Fucellia - Seaweed Flies

Fucellia from CA Beach - Fucellia costalis - female Fucellia from CA Beach - Fucellia costalis - female seaweed fly - Fucellia 9032429 fly - Fucellia - male - female Beach Hopping Insect (not crustacean) - Fucellia Fly - Fucellia tergina Fucellia costalis? - Fucellia Fucellia
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Calyptratae)
Superfamily Muscoidea
Family Anthomyiidae (Root-Maggot Flies)
Genus Fucellia (Seaweed Flies)
Numbers
Systema Dipterorum lists 18 species:
Fucellia aestuum Aldrich, 1918: 178: British Columbia, s. to Oreg.
Fucellia albeola Huckett, 1927: 163: NY
Fucellia antennata Stein, 1910: 23: Alaska, s. to California & e. to Quebec)
Fucellia ariciiformis (Holmgren, 1872: 103): Alaska to Greenland, s. to Manitoba & Newfoundland
Fucellia assimilis Malloch, 1918: 317: California & Baja Calif.
Fucellia biseriata Huckett, 1966: 47: Alaska
Fucellia costalis Stein, 1910: 21: California & Baja Calif.
Fucellia fucorum (Fallén, 1819: 5): Alaska, s. to California; Greenland
Fucellia hypopygialis Ringdahl, 1930: 7: Alaska
Fucellia kamtchatica Ringdahl, 1930: 7: Alaska
Fucellia pictipennis Becker, 1907: 411: Alaska, e. to Greenland
Fucellia pluralis Huckett, 1965: 24: Nunavut, Manitoba
Fucellia rejecta Aldrich, 1918: 171: Oregon, s. to Baja California &Sonora
Fucellia rufitibia Stein, 1910: 25: British Columbia, s. to Baja Calif
Fucellia separata Stein, 1910: 24: British Columbia, s. to Baja Calif.
Fucellia tergina (Zetterstedt, 1845: 1690): Alaska, s. to Sonora; Illinois to Labrador, s. to Florida; Greenland; Bermuda
Fucellia thinobia (Thomson, 1869: 563): Alaska & Oregon, California
Fucellia vibei Collin, 1951: 187: Nunavut
Identification
Key here: (1)(2)

Unlike most Anthomyiidae the eyes of males are dichoptic (i.e., broadly separated above, as in females). In most Anthomyiidae males the eyes are touching or very narrowly separated above.
Habitat
On seashores, also along shores of the Great Lakes.
Season
Adults are active year round, even in northern latitudes on mild winter days.
Food
Eggs are laid on the piles of seaweed, where the larvae develop.
Remarks
Fucellia is in a separate subfamily within the Anthomyiidae: the Fucelliinae.
Male 6th tergite scarcely shorter than 8th sternite, 6th sternite with expanded area on left side, 8th tergite absent, processus longi absent, epiphallus absent, aedeagus posteriorly directed at rest.
Print References
Stein, P. 1910. Zur Kenntniss der Gattung Fucellia Rob. Desv. Wiener Entomologische Zeitung 29: 11-27. (Biodiversity Heritage Library)
Collin, J. E, 1951. A new arctic species of Fucellia (Diptera, Anthomyiidae) with maculated wings. Entomologiske Meddelelser 26: 187-190. (PDF)
Huckett, H. C. 1966. Arctic Muscidae from the Cape Thomson region of Alaska (Diptera). Bulletin of the Brooklyn Entomological Society 59/60: 46-50. (Biodiversity Heritage Library)