Volume 7, Issue 3 pp. 265-285
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Biometric and Genetic Analysis of the Marine Rissoid Rissoa auriscalpium (Gastropoda, Prosobranchia) and its Ecological Implications

Rita Colognola

Rita Colognola

Istituto di Genetica Biochimica ed Evoluzionistica (C. N. R.), Via Abbiategrasso 207, 1–27100 Pavia, Italy.

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Pietro Masturzo

Pietro Masturzo

European Molecular Biology Laboratory, MeyerhofstraBe 1, D-6900 Heidelberg, FRG.

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Giovanni Fulvio Russo

Giovanni Fulvio Russo

Laboratorio di Ecologia del Benthos (Stazione Zoologica di Napoli), Punta S. Pietro, 1–80077 Ischia Porto (Napoli), Italy.

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Mlchele Scardi

Mlchele Scardi

Laboratorio di Ecologia del Benthos (Stazione Zoologica di Napoli), Punta S. Pietro, 1–80077 Ischia Porto (Napoli), Italy.

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Daniele Vlnci

Daniele Vlnci

Laboratorio di Ecologia del Benthos (Stazione Zoologica di Napoli), Punta S. Pietro, 1–80077 Ischia Porto (Napoli), Italy.

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Eugenio Fresi

Eugenio Fresi

Laboratorio di Ecologia del Benthos (Stazione Zoologica di Napoli), Punta S. Pietro, 1–80077 Ischia Porto (Napoli), Italy.

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First published: September 1986
Citations: 12

Abstract

Abstract. Two forms of Rissoa auriscalpium were found in Posidonia oceanica beds around the Island of Ischia (Gulf of Naples). In order to investigate their taxonomical value and to quantify the discriminating features found, the radular, conchometric, genetic, and ecological features of the two forms were analyzed. Ecological observations showed that the distribution of the two forms is strongly correlated with hydrodynamic factors.

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