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Gibson, R.; Junoy, J. (1991). A new species of Tetrastemma (Nemertea: Enopla: Monostiliferoidea) from Ría de Foz, north-western Spain, found living in the mantle cavity of the bivalve mollusc Scrobicularia plana. Zoological Journal of the Linnean Society. 103(3): 225–240.
Gibson, R.; Junoy, J. (1991). A new species of Tetrastemma (Nemertea: Enopla: Monostiliferoidea) from Ría de Foz, north-western Spain, found living in the mantle cavity of the bivalve mollusc Scrobicularia plana. Zoological Journal of the Linnean Society. 103(3): 225–240.
