Biodiversity & Conservation

Snails, slugs, mussels, cockles, clams & squid (Mollusca)

Chitons or 'coat-of-mail' shells (Polyplacophora)
Snails, slugs & sea butterflies (Gastropoda)
Clams, cockles, mussels, oysters, and scallops (Bivalvia)
Cuttlefish, nautilus, octopus & squid (Cephalopoda)

Chitons or 'coat-of-mail' shells (Polyplacophora)

Neoloricata

A chiton
Acanthochitona crinita

Intermediate / Basic

A bristled chiton
Acanthochitona fascicularis

Intermediate / Basic

A chiton
Leptochiton scabridus

Intermediate / Basic

A chiton
Tonicella marmorea

Intermediate / Basic

Snails, slugs & sea butterflies (Gastropoda)

Archaeogastropoda

Painted top shell Calliostoma zizyphinum Intermediate / Basic	Green ormer Haliotis tuberculata Intermediate / Basic	Blue-rayed limpet Patella pellucida Advanced / Intermediate / Basic	Pearly top shell Margarites helicinus Intermediate / Basic	Black-footed limpet Patella depressa Intermediate / Basic
China limpet Patella ulyssiponensis Advanced / Intermediate / Basic	Common limpet Patella vulgata Advanced / Intermediate / Basic	Common tortoiseshell limpet Testudinalia testudinalis Intermediate / Basic	Pheasant shell Tricolia pullus Intermediate / Basic	A keyhole limpet Diodora graeca Intermediate / Basic
Slit limpet Emarginula fissura Intermediate / Basic	Grey top shell Gibbula cineraria Intermediate / Basic	Flat top shell Gibbula umbilicalis Intermediate / Basic	Grooved top shell Jujubinus striatus Intermediate / Basic	Thick top shell Osilinus lineatus Advanced / Intermediate / Basic

Mesogastropoda

Common pelican's foot Aporrhais pespelecani Intermediate / Basic	Needle whelk Bittium reticulatum Intermediate / Basic	DeFolin's lagoon snail Caecum armoricum Advanced / Intermediate / Basic	Chinaman's hat Calyptraea chinensis Intermediate / Basic	Slipper limpet Crepidula fornicata Advanced / Intermediate / Basic
Necklace shell Euspira catena Intermediate / Basic	Laver spire shell Hydrobia ulvae Advanced / Intermediate / Basic	Common periwinkle Littorina littorea Advanced / Intermediate / Basic	Common flat periwinkle Littorina obtusata Intermediate / Basic	Rough periwinkle Littorina saxatilis Intermediate / Basic
Small periwinkle Melarhaphe neritoides Intermediate / Basic	Lagoon snail Paludinella littorina Advanced / Intermediate / Basic	A snail Rissoa parva Intermediate / Basic	A gastropod Simnia patula Intermediate / Basic	Looping snail Truncatella subcylindrica Advanced / Intermediate / Basic
An auger shell Turritella communis Intermediate / Basic	Velvet shell Velutina velutina Intermediate / Basic	A gastropod Cerithiopsis tubercularis Intermediate / Basic	Violet snail Janthina janthina Intermediate / Basic	Banded chink shell Lacuna vincta Advanced / Intermediate / Basic
Alder's necklace shell Euspira pulchella Intermediate / Basic	Arctic cowrie Trivia arctica Intermediate / Basic	Spotted cowrie Trivia monacha Intermediate / Basic	Common wentletrap Epitonium clathrus Intermediate / Basic

Neogastropoda

A gastropod Colus islandicus Intermediate / Basic	Red whelk Neptunea antiqua Intermediate / Basic	Dog whelk Nucella lapillus Advanced / Intermediate / Basic	Oyster drill Ocenebra erinacea Intermediate / Basic	American oyster drill Urosalpinx cinerea Intermediate / Basic
Common whelk Buccinum undatum Intermediate / Basic	Thick-lipped dog whelk Nassarius incrassatus Intermediate / Basic	Netted dog whelk Nassarius reticulatus Intermediate / Basic	Veined rapa whelk Rapana venosa Intermediate / Basic

Cephalaspidea

A sea slug
Acteon tornatilis

Intermediate / Basic

Lobe shell
Philine aperta

Advanced / Intermediate / Basic

A sea slug
Runcina coronata

Intermediate / Basic

Anaspidea

Royal flush sea slug
Akera bullata

Intermediate / Basic

Aplysiomorpha

A sea hare
Aplysia punctata

Intermediate / Basic

Sacoglossa

Solar-powered sea slug
Elysia viridis

Intermediate / Basic

A sea slug
Stiliger bellulus

Intermediate / Basic

Notaspidea

Yellow-plumed sea slug
Berthella plumula

Intermediate / Basic

A sea slug
Pleurobranchus membranaceus

Intermediate / Basic

Nudibranchia

A sea slug Acanthodoris pilosa Intermediate / Basic	A sea slug Adalaria proxima Intermediate / Basic	Grey sea slug Aeolidia papillosa Intermediate / Basic	A sea slug Aeolidiella alderi Intermediate / Basic	A sea slug Aeolidiella sanguinea Intermediate / Basic
A dorid nudibranch Aldisa zetlandica Intermediate / Basic	A nudibranch Ancula gibbosa Intermediate / Basic	Sea lemon Archidoris pseudoargus Intermediate / Basic	A sea slug Armina loveni Intermediate / Basic	A sea slug Atagema gibba Intermediate / Basic
A sea slug Cadlina laevis Intermediate / Basic	A sea slug Caloria elegans Intermediate / Basic	Scarlet lady Coryphella browni Intermediate / Basic	A sea slug Coryphella gracilis Intermediate / Basic	A sea slug Coryphella lineata Intermediate / Basic
A sea slug Crimora papillata Intermediate / Basic	A sea slug Cuthona foliata Intermediate / Basic	A sea slug Dendronotus frondosus Intermediate / Basic	A sea slug Diaphorodoris luteocincta Intermediate / Basic	A sea slug Doris sticta Intermediate / Basic
A sea slug Doto fragilis Intermediate / Basic	A sea slug Embletonia pulchra Intermediate / Basic	A sea slug Eubranchus farrani Intermediate / Basic	A sea slug Flabellina pellucida Intermediate / Basic	A sea slug Geitodoris planata Intermediate / Basic
A sea slug Goniodoris nodosa Intermediate / Basic	Blue spot slug Greilada elegans Intermediate / Basic	A nudibranch Hancockia uncinata Intermediate / Basic	A sea slug Hero formosa Intermediate / Basic	A sea slug Janolus cristatus Intermediate / Basic
A sea slug Jorunna tomentosa Intermediate / Basic	Orange-clubbed sea slug Limacia clavigera Intermediate / Basic	Yellow skirt slug Okenia elegans Intermediate / Basic	A sea slug Okenia leachii Intermediate / Basic	A sea slug Onchidoris bilamellata Intermediate / Basic
A sea slug Onchidoris muricata Intermediate / Basic	A sea slug Palio nothus Intermediate / Basic	A sea slug Polycera faeroensis Intermediate / Basic	A sea slug Polycera quadrilineata Intermediate / Basic	A sea slug Rostanga rubra Intermediate / Basic
Lagoon sea slug Tenellia adspersa Advanced / Intermediate / Basic	A sea slug Trapania maculata Intermediate / Basic	A sea slug Trapania pallida Intermediate / Basic	A sea slug Tritonia hombergi Intermediate / Basic	A sea slug Tritonia nilsodhneri Intermediate / Basic
A sea slug Facelina auriculata Intermediate / Basic	A sea slug Facelina bostoniensis Intermediate / Basic

Systellommatophora

Celtic sea slug
Onchidella celtica

Intermediate / Basic

Clams, cockles, mussels, oysters, and scallops (Bivalvia)

Arcoida

Dog cockle
Glycymeris glycymeris

Intermediate / Basic

Mytiloida

Marbled crenella
Modiolarca tumida

Intermediate / Basic

Bearded mussel
Modiolus barbatus

Intermediate / Basic

Horse mussel
Modiolus modiolus

Advanced / Intermediate / Basic

Green crenella
Musculus discors

Advanced / Intermediate / Basic

Common mussel
Mytilus edulis

Advanced / Intermediate / Basic

Ostreoida

Queen scallop Aequipecten opercularis Intermediate / Basic	Saddle oyster Anomia ephippium Intermediate / Basic	Humpback scallop Chlamys distorta Intermediate / Basic	Variegated scallop Chlamys varia Intermediate / Basic	Pacific oyster Crassostrea gigas Intermediate / Basic
American oyster Crassostrea virginica Intermediate / Basic	Native oyster Ostrea edulis Advanced / Intermediate / Basic	Great scallop Pecten maximus Advanced / Intermediate / Basic

Veneroida

A bivalve mollusc Abra alba Advanced / Intermediate / Basic	A bivalve mollusc Abra nitida Intermediate / Basic	Spiny cockle Acanthocardia aculeata Intermediate / Basic	Thin tellin Angulus tenuis Intermediate / Basic	Icelandic cyprine Arctica islandica Advanced / Intermediate / Basic
A bivalve mollusc Astarte sulcata Intermediate / Basic	Smooth venus Callista chione Intermediate / Basic	Common cockle Cerastoderma edule Advanced / Intermediate / Basic	Lagoon cockle Cerastoderma glaucum Advanced / Intermediate / Basic	Striped venus clam Chamelea gallina Intermediate / Basic
Banded venus Clausinella fasciata Intermediate / Basic	Banded wedge shell Donax vittatus Intermediate / Basic	Rayed Artemis Dosinia exoleta Intermediate / Basic	Smooth Artemis Dosinia lupinus Intermediate / Basic	Bean-like tellin Fabulina fabula Advanced / Intermediate / Basic
A bivalve mollusc Lasaea adansoni Intermediate / Basic	A bivalve mollusc Lucinella divaricata Intermediate / Basic	Baltic tellin Macoma balthica Advanced / Intermediate / Basic	Hard-shell clam Mercenaria mercenaria Intermediate / Basic	A bivalve mollusc Mysella bidentata Intermediate / Basic
A cockle Parvicardium ovale Intermediate / Basic	American piddock Petricola pholadiformis Intermediate / Basic	A razor shell Phaxas pellucidus Intermediate / Basic	Peppery furrow shell Scrobicularia plana Intermediate / Basic	A bivalve mollusc Spisula elliptica Intermediate / Basic
A surf clam Spisula solida Advanced / Intermediate / Basic	Atlantic surf clam Spisula solidissima Intermediate / Basic	Chequered carpet shell Ruditapes decussatus Intermediate / Basic	Manila clam Ruditapes philippinarum Intermediate / Basic	A bivalve mollusc Tellimya ferruginosa Intermediate / Basic
Northern hatchet shell Thyasira gouldi Advanced / Intermediate / Basic	Oval venus Timoclea ovata Intermediate / Basic	A bivalve mollusc Tridonta montagui Intermediate / Basic	Pullet carpet shell Venerupis senegalensis Advanced / Intermediate / Basic	Warty venus Venus verrucosa Intermediate / Basic
A bivalve Circomphalus casina Intermediate / Basic

Myoida

White piddock Barnea candida Intermediate / Basic	Basket shell Corbula gibba Advanced / Intermediate / Basic	Wrinkled rock borer Hiatella arctica Intermediate / Basic	Sand gaper Mya arenaria Advanced / Intermediate / Basic	Blunt gaper Mya truncata Intermediate / Basic
Common piddock Pholas dactylus Advanced / Intermediate / Basic	Great shipworm Teredo navalis Intermediate / Basic

Limoida

Gaping file shell
Limaria hians

Intermediate / Basic

Pholadomyoida

A bivalve mollusc
Thracia convexa

Intermediate / Basic

A bivalve mollusc
Thracia villosiuscula

Intermediate / Basic

Pterioida

Fan mussel
Atrina fragilis

Advanced / Intermediate / Basic

Nuculoida

A bivalve mollusc
Nucula nitidosa

Advanced / Intermediate / Basic

A bivalve mollusc
Nucula sulcata

Intermediate / Basic

Cuttlefish, nautilus, octopus & squid (Cephalopoda)

Sepiida

Elegant cuttlefish
Sepia elegans

Intermediate / Basic

Common cuttlefish
Sepia officinalis

Advanced / Intermediate / Basic

Pink cuttlefish
Sepia orbigniana

Intermediate / Basic

Sepiolida

Stout bobtail
Rossia macrosoma

Intermediate / Basic

Common bobtail
Sepietta oweniana

Intermediate / Basic

Little cuttlefish
Sepiola atlantica

Intermediate / Basic

Dwarf bobtail
Sepiola rondeletii

Intermediate / Basic

Teuthida

Little squid Alloteuthis media Intermediate / Basic	European common squid Alloteuthis subulata Intermediate / Basic	Broadtail shortfin squid Illex coindetii Intermediate / Basic	Long finned squid Loligo forbesi Intermediate / Basic	Common squid Loligo vulgaris Intermediate / Basic
Lesser flying squid Todaropsis eblanae Intermediate / Basic

Octopoda

North Atlantic octopus
Bathypolypus arcticus

Intermediate / Basic

Curled octopus
Eledone cirrhosa

Intermediate / Basic

Common octopus
Octopus vulgaris

Intermediate / Basic