It looks like a predaceous diving beetle (Family Dytiscidae). It's hard to determine a genus or species from your photo because multiple genera have that light-colored border, and it's hard to make out enough detail from the photo to narrow down an ID. They can also range from small (1 cm) to large (4 cm), and it's hard to tell how big it is here.
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It looks like a predaceous diving beetle (Family Dytiscidae). It's hard to determine a genus or species from your photo because multiple genera have that light-colored border, and it's hard to make out enough detail from the photo to narrow down an ID. They can also range from small (1 cm) to large (4 cm), and it's hard to tell how big it is here.