Temporal range: Late Llandovery – ?Late Lochkovian
Birkenia elegans by avancna-d7o7x9c
A restoration of Birkenia elegans (middle) compared with three Ainiktozoon loganese
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Anaspida
Order: Birkeniida
Family: Birkeniidae
Genus: Birkenia
Traquair, 1899
Type species
Birkenia elegans
Traquair, 1899
Referred species
  • Birkenia elegans
    (Traquair, 1899)
  • Birkenia robusta (Blom, Märss et Miller, 2002)

Birkenia is a extinct genus of anaspid fish from Middle Silurian strata of Northern Europe, and Middle Silurian to possibly Earliest Devonian strata of Arctic Canada.

Intact fossil specimens of B. elegans suggest the living animal reached a length of up to 10.0 cm (3.9 in), and was an active swimmer. In addition to whole specimens and scale microfossils of B. elegans, which are found in Great Britain and Scandinavia, scales of a second species, B. robusta, are found in Late Silurian strata of Scandinavia and Estonia. The scales of B. robusta differ from those of B. elegans in that, as the specific epithet suggests, the scales of the former are more robustly proportioned than those of the latter.