LUISIELLA INEXCUTATA GEN. ET SP. NOV. (PISCES, CLUPEIFORMES, DUSSUMIERIIDAE) DEL ]URASICO SUPERIOR
DE LA PROVINCIA DE CHUBUT, ARGENTINA

Andreina R. Bocchino

Abstract


The author describes Luisiella ínexcutata nov. gen., nov. sp. from Chubut 43c25'L.S probably nearer to the Leptolepiforme sand undoubtedly a member of the Clu- peíforrnes. Luisiella is assigned to the Duesumieriidao (Spratelloidínae) principally by the obscéiice of pelvic scuta. The age Late Jurassic, is certified by paleobotanical and lithologic evidences. Luísiella inexcutata is the most ancíent Dussumieriidae, found up to know, and is the only representative known in South America. One can presume that the ecological condítíons cf the cenosis integrated by this fish was very different compared with the conditions prevailing in recent t.rnes in Patagonia, and points to a tropical environment during the Mesozoic.

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