Preprint volume - SIBM

Pre-print Volume - Posters
BENTHOS COMMITEE
F. ESPOSITO, L. RIBERO, R. MUSSAT SARTOR, N. NURRA, D. PESSANI
Laboratorio di Zoologia e Biologia Marina, Dipartimento di Biologia Animale e dell’Uomo, Università di Torino,
Via Accademia Albertina, 13 – 10123 Torino, Italia.
daniela.pessani@unito.it
GASTROPODS AND POLYCHAETES IN THE UPPER
INFRALITTORAL ZONE OF ENFOLA ISTMUS (ELBA ISLAND):
NEW RECORDS AND REVIEW OF NOMENCLATURE
GASTEROPODI E POLICHETI NELL’INFRALITORALE
DELL’ISTMO DELL’ENFOLA (ISOLA D’ELBA):
NUOVE SEGNALAZIONI E REVISIONE DELLA NOMENCLATURA
Abstract – Two species of Gastropods, Alvania pagodula and Rissoa decorata, never reported in Northern
Tirrhenyan Sea, have been collected at Enfola istmus (Elba island) on hard substratum (meso- and upper
infralittoral). Besides, the work proposes the review of the nomenclature in regard to the Polychaetes
Eulalia viridis and Nereis zonata.
Keywords: Gastropods, Polychaetes, biodiversity, Elba Island.
Introduction – Enfola Promontory is connected to Elba Island by an istmus, with sides
arranged in direction N-S. The aim of the work is the census of Gastropods and
Polychaetes of the benthic community in mesolittoral and upper infralittoral of
northern and southern sides of the istmus.
Materials and methods – The methodology used for the study of the hard bottom
benthic communities is the scraping sampling on a standard area (400 cm 2 ). A sample
and its replicate were collected at a maximum depth of 1 m, in 4 stations, in May and
September 2008, in the northern and southern side of the itsmus obtaining on the whole
sixteen samples (and 16 replicates).
Results – The northern area is facing directly the open sea (high hydrodinamism); the
southern one is located into Viticcio Gulf (low hydrodinamism).
In the hard bottom biocoenosis of photophilous algae, 37 species of Mollusca and 49 of
Polychaetes for the northern area and 63 species of Mollusca and 73 of Polychaetes for
the southern one were collected.
In the northern area the finding of 3 specimens of Alvania pagodula (September) and 2
of Rissoa decorata (September) is noticeable: the species are not present in the
checklist of the Italian marine fauna (Oliverio et al., 2008) for the biogeopraphical
sectors 1 and 2. The specimens belonging to the two species were photographed and
measured (L=lenght, w=width; sL=stoma lenght; sw=stoma width).
Alvania pagodula Philippi 1846. Specimen 1: L=2.0 mm, w=1.1 mm, sL=0.8 mm,
sw=0.5 mm. Specimen 2: L=2.4 mm, w=1.0 mm, sL=0.7 mm, sw=0.6 mm. Specimen
3: L=2.1 mm, w=1.0 mm, sL=0.8 mm, sw=0.7 mm.
Rissoa decorata (Bucquoy, Dautzenberg & Dollfus, 1884). Specimen 1: L=2.8 mm,
w=1.1 mm, sL=1.2 mm, sw=0.9 mm. Specimen 2: L=2.0 mm, w=1.1 mm, sL=0.8 mm,
sw=0.6 mm.
In September 2008 also 6 specimens of the Polychaete Phyllodocide Eulalia viridis
(sensu Fauvel, 1923) were found, 3 in the northern area, 3 in the southern one. This
41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010
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