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		Creepy crawlies Butterflies          & moths Common field        grasshopper Dragonflies Earwig Garden spider Giant wood wasp House spider Hoverfly Pond skater Water boatman Garden snail Great pond snail		Great pond snail. PAGE 1 OF 2                Scientific name: Lymnaea stagnalis. Average shell length: 40mm. The UK's largest aquatic snail, the great pond snail can be found in many still or slow moving water features. In older specimens the outer layer of the shell often becomes flaky. Commonly seen floating upside down at the water surface. Very common in Staffordshire.