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Marine snails

Myosotella denticulata. Shell height 6.5mm. Aperture lacks an operculum. Images of live animal in water. High water mark and just above. Salting on sheltered Menai Strait (full salinity sea water). Under stones with terrestrial invertebrates.
Myosotella denticulata
Myosotella myosotis. Heights 7.5mm and 6mm. 2 or 3 teeth on inner lip. 0 or 1(max.) tooth on outer lip. Lip thickens when mature (larger specimen). MHW, salt marsh, brackish 22ppt, Severn Estuary, August 2011.
Myosotella myosotis
Emarginula fissura
Emarginula fissura
Diodora graeca
Diodora graeca
Tricolia pullus
Tricolia pullus
Margarites helicinus
Margarites helicinus
Gibbula tumida
Gibbula tumida
Gibbula cineraria
Gibbula cineraria
Gibbula umbilicalis
Gibbula umbilicalis
Jujubinus miliaris
Jujubinus miliaris
Jujubinus montagui
Jujubinus montagui
Osilinus lineatus
Phorcus lineatus
Calliostoma zizyphinum
Calliostoma zizyphinum
Calliostoma granulatum
Calliostoma granulatum
Tectura testudinalis
Testudinalia testudinalis (O. F. Müller, 1776)
Tectura virginea
Tectura virginea
Dorsal (left) and ventral view of shell
Patella depressa
Dorsal (left) and ventral view of shell
Patella ulyssiponensis
Dorsal (left) and ventral view of shell
Patella vulgata
Helcion pellucidum
Patella pellucida Linnaeus, 1758
Turritella communis
Turritellinella tricarinata (Brocchi, 1814)
Lacuna crassior
Lacuna crassior
Lacuna pallidula
Lacuna pallidula
Lacuna vincta. Long cephalic tentacles. Two smaller metapodial tentacles on rear of foot. Menai Strait, Wales. Febuary 2011.
Lacuna vincta
Littorina littorea
Littorina littorea
Littorina nigrolineata
Littorina nigrolineata
Littorina obtusata
Littorina obtusata
Littorina saxatilis
Littorina saxatilis/arcana agg.
Juvenile Rissoa parva. Shell height 2.6mm. c: costa (yet to develop on much of body whorl). s: bifid snout. l: brown spiral line connecting transverse brown streaks (spiral line absent on some shells). LWS, Menai Strait, Wales. September 2011.
Rissoa parva
Hydrobia ulvae on Enteromorpha. H. ulvae is named after Ulva on which it can also be found. It moves through the weed with the aid of prehensile lobes on the front of its foot. Shell 4.2mm high, deep suture form. Mouth of Dee Estuary.
Peringia ulvae
Potamopyrgus antipodarum. Darker dorsal surface of tentacle and fine white medial line indicated by arrow. Ribbing inside aperture is ctenidium (gill). From slowly flowing freshwater pool at top of salting, Dee Estuary, Cheshire
Potamopyrgus antipodarum
Live juveniles of Caecum armoricum collected from the Fleet, Dorset in October 2011 by Lin Baldock.
Caecum armoricum
Aporrhais pespelecani
Aporrhais pespelecani
Calyptraea chinensis
Calyptraea chinensis
Crepidula fornicata
Crepidula fornicata
Capulus ungaricus
Capulus ungaricus
Trichotropis borealis
Trichotropis borealis
Simnia patula
Simnia patula
Trivia arctica with mantle half retracted. Dark marks frequent on edge of mantle but never on the shell. Usually less common live on shore than T. monacha, but 100+ seen on a shore on Menai Strait, Wales August 2010.
Trivia arctica
Trivia monacha, live adult. Mantle half extended, lateral view. LWS, Menai Strait, Wales. Aug. 2010.
Trivia monacha
Erato voluta
Erato voluta
Velutina velutina
Velutina velutina
Polinices montagui
Polinices montagui
Polinices pulchellus
Polinices pulchellus
Euspira catena
Euspira catena
Marshallora adversa 6.3mm ~ Mweenish Island, County Galway
Marshallora adversa
Epitonium clathrus
Epitonium clathrus
Epitonium trevelyanum
Epitonium trevelyanum
Epitonium turtonis
Epitonium turtonis
Melanella alba
Melanella alba
Trophon barvicensis
Trophon barvicensis
Trophon muricatus
Trophon muricatus
Trophon truncatus
Trophon truncatus
Ocenebra erinacea
Ocenebra erinacea
Nucella lapillus
Nucella lapillus
Buccinum humphreysianum
Buccinum humphreysianum
Buccinum undatum
Buccinum undatum
Colus gracilis
Colus gracilis
Colus jeffreysianus
Colus jeffreysianus
Neptunea antiqua
Neptunea antiqua
Volutopsius norvegicus
Volutopsius norwegicus
Comparison T. nitida with T. reticulata sensu stricto. Key to numbers in Species account description.
Tritia nitida (Jeffreys, 1867)
Hinia reticulata
Tritia reticulata (Linnaeus, 1758)
Hinia incrassata
Tritia incrassata (Strøm, 1768)
Hinia pygmaea
Tritia varicosa (W. Turton, 1825)
Haedropleura septangularis
Haedropleura septangularis
Mangelia nebula
Mangelia nebula
Raphitoma linearis 6.4mm ~ Borth, Ceredigion
Raphitoma linearis
Teretia anceps
Teretia anceps
Turbonilla lactea 8.4mm ~ Mweenish Island, County Galway
Turbonilla lactea
Acteon tornatilis
Acteon tornatilis
Doto sarsiae. Length 8.5 mm. Large specimen with yellowish tinted epithelium and orange-red viscera. Tiny seventh pair of cerata concealed by sixth pair. On Garveia nutans, LWS, Menai Strait, Wales. April 2011. Conf. B. Picton.
Doto sarsiae
Facelina auriculata. Length 19mm. Iridescence well developed on head and cerata. White splashes down front of cerata. Yellow lamellae on rhinophores. On rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011.
Facelina auriculata