"Larva, pupa, and adult respectively of water-beetle (Dytiscus marginalis)." -Thomson, 1916

Water Beetle Stages

"Larva, pupa, and adult respectively of water-beetle (Dytiscus marginalis)." -Thomson, 1916

The pupa of Dytiscus marginalis, the Great Diving Beetle.

Great Diving Beetle

The pupa of Dytiscus marginalis, the Great Diving Beetle.