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The size (~2 inches), broad "quadrate" head, and long posterior abdomen leads me to believe this is a relativerelatively large larva of a Predaceous Diving Beetle (family Dytiscidae).
The size (~2 inches), broad "quadrate" head, and long posterior abdomen leads me to believe this is a relative large larva of a Predaceous Diving Beetle (family Dytiscidae).
The size (~2 inches), broad "quadrate" head, and long posterior abdomen leads me to believe this is a relatively large larva of a Predaceous Diving Beetle (family Dytiscidae).
I couldn't find any accessible keys for the larvae of European or even more broadly Palearctic species.
Larval keys do exist, though just for other regions of the world (e.g., Michat et al, 2008, for Argentina and Watts, 2002, for Australia) or for only narrow taxa (e.g., Fery 2003 or Holmgren et al 2016).
Pederzani (1995) provides a global key for adults.
Miller and Bergsten (2016) supposedly provide a fairly stellar global-focused key to genera, but I could not find access to it online.
Some characteristics of note:
Larval characteristics of the family (from WV DEP): two claws on each leg; legs 5-segmented; abdomen usually terminates in a pair of urogomphi
Differentiating characteristics between common genera Dytiscus and Cybister available on bugguide.net
I couldn't find any accessible keys for the larvae of European or even more broadly Palearctic species.
Larval keys do exist, though just for other regions of the world (e.g., Michat et al, 2008, for Argentina and Watts, 2002, for Australia) or for only narrow taxa (e.g., Fery 2003 or Holmgren et al 2016).
Pederzani (1995) provides a global key for adults.
Miller and Bergsten (2016) supposedly provide a fairly stellar global-focused key to genera, but I could not find access to it online.
Some characteristics of note:
Larval characteristics of the family (from WV DEP): two claws on each leg; legs 5-segmented; abdomen usually terminates in a pair of urogomphi
Differentiating characteristics between common genera Dytiscus and Cybister available on bugguide.net
I couldn't find any accessible keys for the larvae of European or even more broadly Palearctic species.
Larval keys do exist, though just for other regions of the world (e.g., Michat et al 2008 for Argentina and Watts 2002 for Australia) or for only narrow taxa (e.g., Fery 2003 or Holmgren et al 2016).
Pederzani (1995) provides a global key for adults.
Miller and Bergsten (2016) supposedly provide a fairly stellar global-focused key to genera, but I could not find access to it online.
Some characteristics of note:
Larval characteristics of the family (from WV DEP): two claws on each leg; legs 5-segmented; abdomen usually terminates in a pair of urogomphi
Differentiating characteristics between common genera Dytiscus and Cybister available on bugguide.net
