MOLLUSCA

including chitons, limpets, sea snails, sea-slugs and bivalves

P.A. Gainey & S.M. Turk

Gainey & Turk, in Spalding, A. (Ed) 1997, have reviewed the status of this group around the coasts of Cornwall. The systematic sequence and nomenclature follows Howson & Picton (1997). Approximately 750 species of marine mollusc have been mapped for the British Marine Area (Seaward, 1982, 1990 & 1993). Smith and Heppell (1991) list some 846 species, including many from deep water and some that could well be found in the area. Only two species of molluscs found in the Cornish area (Truncatella subcylindrica and Paludinella littorina) are listed by Bratton (1991). Polyplacophora; Gastropoda: Archaeogastropoda, Mesogastropoda, Neogastropoda, Cephalaspidea, Acochlidioidea, Sacoglossa, Anaspidea, Nudibranchia, Systellommatophora, Pelecypoda, Pterioida, Ostreoida, Mytiloida, Veneroida and Myoida by P.A. Gainey; Scaphopoda by S.M. Turk. The authors gratefully acknowledge the assistance of Dr. J. Light, Hon. Marine Recorder, Conchological Society of Great Britain and Ireland.

1. POLYPLACOPHORA ( chitons)

Leptochiton scabridus

2. GASTROPODA: ARCHAEOGASTROPODA ( top-shells and limpets)

Jujubinus striatus Grooved Topshell

3. GASTROPODA: MESOGASTROPODA ( sea-snails)

Alvania cancellata Latticed Spire-shell

Bittium simplex

Charonia lampas Triton

Cheirodonta pallescens

Epitonium lamellosum

Galeodea rugosa

Janthina janthina Violet Sea-snail

Janthina exigua Ridged Violet Sea-snail

Janthina pallida Pale Violet Sea-snail

Paludinella littorina A lagoon snail

Rissoa guerinii

Truncatella subcylindrica Looping Snail

Vitreolina curva

4. GASTROPODA: NEOGASTROPODA (whelks)

Chauvetia brunnea

Ocinebrina aciculata

5. GASTROPODA: CEPHALASPIDEA (bubble-shells)

Haminea hydatis

Runcina ferruginea

6. GASTROPODA: ACOCHLIDIOIDEA

Hedylopsis spiculifera

Microhedyle glandulifera

Philinoglossa praelongata

7. GASTROPODA: SACOGLOSSA

Stiliger bellula

8. GASTROPODA: ANASPIDEA (sea-hares)

Aplysia depilans

Aplysia fasciata

9. GASTROPODA: NUDIBRANCHIA (sea-slugs)

Aeolidiella alderi

Armina loveni

Atagema gibba

Calma glaucoides

Crimora papillata

Cumanotus beaumonti

Discodoris rosi

Doris sticta

Doto hystrix

Doto koenneckeri

Doto lemchei

Facelina annulicornis

Greilada elegans Spotted Satsuma Slug

Hancockia uncinata

Okenia elegans Yellow Skirt Slug

Thecacera pennigera

Trapania pallida

Tritonia manicata

Tritonia nilsodhneri Fan Slug

10. GASTROPODA: SYSTELLOMMATOPHORA

Onchidella celtica Celtic Sea-slug

11. SCAPHOPODA (Tusk-shells)

Of the seven species in British waters, only two occur in Cornish waters, one of them, Antalis entalis (Linneaus), being very widespread. The other, Antalis vulgaris (da Costa), is a “southern” species which lives in depths of three or more metres (Jones & Baxter, 1987). Since 1950, living examples have been found on the Channel coasts and west Ireland, whilst only shells have been recorded from Cornwall.

12. PELECYPODA: MYTILOIDA (mussels)

Modiolus adriaticus Tulip Horse Mussel

Mytilus galloprovincialis Mediterranean Mussel

13. PELECYPODA: PTERIOIDA (wing-oysters)

Atrina fragilis Fan Mussel

Pteria hirundo Wing-oyster

14. PELECYPODA: OSTREOIDA (oysters)

Ostrea edulis Native Oyster

15. PELECYPODA: VENEROIDA (venus shells, cockles etc.)

Acanthocardia aculeata Spiny Cockle

Callista chione Smooth Venus

Galeomma turtoni Turton’s Weasel-eye

Lucinella divaricata Turton’s Weasel-eye

Tellimya phascolionis

16. MYOIDA (gapers etc.)

Gastrochaena dubia Flask-shell

Pholadidea loscombiana Paper Piddock

17. CEPHALOPODA (octopus, squid, and cuttlefish)

Illex coindetii Broadtail Shortfin Squid

Octopus vulgaris Common Octopus

Rossia macrosoma Stout Bobtail

Sepia elegans Elegant Cuttlefish

Sepia orbignyana Pink Cuttlefish

Sepietta oweniana Common Bobtail