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can dwell thanks to the presence of symbiotic bacteria (Reid & Brand, 1986; South-
ward, 1986) which lead to a sulphide-oxidising methabolism in the bivalve (Dando &

Tab. 3 - Species list, and total number of collected specimens (TNS) in the Egadi Islands.
In brackish is reported the number of stations investigated for each island.

Bionomical MA LE FA GR TNS

features (12) (5) (11) (2)

Abra alba (Wood) Lim. toll. 1 1

Acantochitona crinita (Pennant) 2 24

Acantochitona fascicularis (L.) 1 1

Anomia ephippium L. LRE 11

Astarte fusca (Poli) Glar 21 3

Bivalvia indet. 88

Bulinus brandaris (L.) Sspr 11

Callochiton septemvalvis (Montagu) 1 1

Calyptraea chinensis (L.) SD 1 23

Cardita calyculata (L.) AP excl 11

Chiton corallinus (Risso) 88

Chiton sp. 12 3

Chlamys varia (L.) DC pref. 2 2

Clausinella fasciata (Da Costa) DC pref 3 3

Corbula gibba (Olivi) ind.inst.-SO 12 3

Digitaria digitaria (L.) 11

Gibberula sp. 11

Glans aculeata (Poli) Mixt. 11

Gonilia calliglypta (Dall) DC pref 1 1

Hiatella arctica (L.) SD 77

Ischnochiton rissoi (Payraudeau) 1 1

Laevicardium crassum (Gmelin) SGCF pref 11

Lepidopleurus (P.) africanus Nierstrasz DC 1 12

Limatula subovata (Jeffreys) 3 3

Limea loscombi (Sowerby) DC excl 2 2

Modiolula phaseolina (Philippi) DC excl 1 1

Musculus discors (L.) LRE 33

Myrtea spinifera (Montagu) Ind.SO 11

Mytilidae indet. 55

Neverita josephinia Risso SFBC/SFBC excl 1 1

Nucula sulcata Bronn ind.inst.-lim.str. 1 1 3 5

Nuculana commutata (Philippi) Mixt. 33

Pitar rudis (Poli) DC pref 11

Polyplacophora indet 11

Plagiocardium papillosum (Poli) DC pref 2 24

Prosobranchia indet. 112

Psammobia costulata Turton SGCF excl 2 1 1 4

Pteromis minuta (Scacchi) 11

Tellina balaustina L. Mixt. 2 13

Tellina donacina L. DC excl 1 1

Tellina serrata Brocchi DL 1 1

Timoclea ovata (Pennant) DC-DE-DL 2 57

Trivia pulex (Solander in J.E.Gray) 11

Venericardia antiquata (L.) SVMC pref 11

Venus verrucosa L. HP excl 11

Volvarina mitrella (Risso) 11

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