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Abstract
Intact valves of a species originally described as Triceratium rectangulare Grove & Sturt have been found in VEMA core material from the Falklands Plateau. Characters additional to those described by Grove & Sturt separate this taxon at generic level from all other known diatoms and a new genus, Fontigonium, is established for it. The genus appears to be restricted to the middle to upper Eocene of the South Pacific and South Atlantic Oceans. Relationships with Trinacria Heiberg and Solium Heiberg are discussed and Fontigonium is placed in the family Hemiaulaceae Heiberg.
