Rolf W. Feyling-Hanssen; The foraminifer Elphidium excavatum (Terquem) and its variant forms. Micropaleontology ; 18 (3): 337–354. doi:
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Four ecophenotypes of this species, each one is given a "forma" name and found to inhabit a different environment (arctic, subarctic-boreal, boreal and Lusitanian waters)
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