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Marschner, Leonie, Julian Staniek, Silke Schuster, Rita Triebskorn, and Heinz-R Köhler. External and Internal Shell Formation in the Ramshorn Snail Marisa Cornuarietis Are Extremes in a Continuum of Gradual Variation in Development. BioMed Central, 2013.

Marschner, Leonie, et al. External and Internal Shell Formation in the Ramshorn Snail Marisa Cornuarietis Are Extremes in a Continuum of Gradual Variation in Development. BioMed Central, 2013.