Erik Stensiö

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Erik Helge Osvald Stensiö (2 October 1891 – 11 January 1984) was a Swedish paleozoologist.

Erik Andersson, as his original name was, was born in the village of Stensjö in Döderhult parish in Kalmar County; he later took his new surname from his place of origin and is occasionally referred to with both names (as Erik Andersson Stensiö or Erik A. Stensiö). He received his Ph.D. and a docentship in paleontology from Uppsala University in 1921 and became professor and keeper at the Zoopaleontological (later called the Paleozoological) department of the Swedish Museum of Natural History in Stockholm in 1923, a position he held until his retirement in 1959.

Stensiö specialized in the anatomy and evolution of "lower" vertebrates. His studies of placoderms showed them to be related to modern sharks. His first major work was Triassic fishes from Spitzbergen (part I: Vienna 1921; part II: Stockholm 1925) was based on material collected during his expeditions to Spitsbergen in 1912, 1913, 1915 and 1916.

He founded the so-called Stockholm school in paleozoology, continued notably by his successors in the professorship Erik Jarvik and Tor Ørvig.

Stensiö was elected a Foreign Member of the Royal Society in 1946. He received the Wollaston Medal in 1953, and the Linnean Medal of the Linnean Society of London in 1957.