AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Planorbarius corneus | |
Date of the first record (?) | 1815 References: Minchin, D. (2021) Records of the cryptogenic Great Ramshorn Snail (Planorbarius corneus (Linnaeus)) from the Shannon Navigation. Irish Naturalists’ Journal 37 (2): 81-84. Comments: The earliest records of P. corneus were of its presence in the Barrow and Liffey areas in about 1815 (Stelfox 1911). Specimens were collected from Monasterevin, Co. Kildare, in 1895 by Robert Scharff; and soon after it was recorded in Sligo at the Markree Estate in 1900 (in Ross 1984). |
Recipient region (?) | Country: Ireland LME: 24. Celtic-Biscay Shelf LME sub-region: Celtic seas References: Minchin, D. (2021) Records of the cryptogenic Great Ramshorn Snail (Planorbarius corneus (Linnaeus)) from the Shannon Navigation. Irish Naturalists’ Journal 37 (2): 81-84. Comments: Over the last fifty years it will have become more widespread in Ireland. In the summer of 1971 Kerney (1972) found P. corneus in south Tipperary, in an area unconnected to the Shannon. Kerney (1972) also records observations made by Michael Kennedy, of the Inland Fisheries Trust, for east and west Cork, north-east Galway, Roscommon, Leitrim, Cavan and Monaghan. Some of Kennedy’s records may have been within the navigable areas of the upper Shannon. Records of this snail reported here were made in association with separate investigations within the navigation of the Shannon River. |
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Source region (?) | Not entered |
Pathway / Vector (?) | Unknown References: Minchin, D. (2021) Records of the cryptogenic Great Ramshorn Snail (Planorbarius corneus (Linnaeus)) from the Shannon Navigation. Irish Naturalists’ Journal 37 (2): 81-84. Comments: It was most probably introduced to Ireland with aquatic ornamental plants. The snail is often used in aquaria.The likely explanation for the appearance of this snail probably results with its association with aquatic ornamental plants and then spreading from centres of high population. Natural spread following its establishment in separate localities in Ireland almost certainly then took place. Its spread along canals could then explain its arrival to the Shannon region. The spread by anglers using snails as bait, and by migrating birds, might have taken place but there is no direct evidence for either of these modes of transmission. |
Habitat type (?) | Lake River References: Minchin, D. (2021) Records of the cryptogenic Great Ramshorn Snail (Planorbarius corneus (Linnaeus)) from the Shannon Navigation. Irish Naturalists’ Journal 37 (2): 81-84. Comments: Living specimens were most usually found associated with macrophytes or associated with stones in shallows where there were charophytes. |
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Wave exposure (?) | Not entered | |
Salinity range (?) | Venice system: 1. Limnetic [<0.5psu] |
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Temperature range (?) | Not entered |
Zonation / Substratum (?) | Not entered | |
Reproductive duration (?) | Not entered | |
Reproductive seasonality (?) | Not entered | |
Migration pattern (?) | Not entered |
Population status (?) | Established (Low level of certainty) References: Minchin, D. (2021) Records of the cryptogenic Great Ramshorn Snail (Planorbarius corneus (Linnaeus)) from the Shannon Navigation. Irish Naturalists’ Journal 37 (2): 81-84. Comments: Over the last fifty years it will have become more widespread in Ireland. |
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Species status (?) | Cryptogenic References: Minchin, D. (2021) Records of the cryptogenic Great Ramshorn Snail (Planorbarius corneus (Linnaeus)) from the Shannon Navigation. Irish Naturalists’ Journal 37 (2): 81-84. |
Created by | Dan Minchin, 2022-04-22 |