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Perlodes microcephalus

larva  

  -    . . .
  - Order Plecoptera
  - Family Perlodidae
  - Genus Perlodes
  - Species microcephalus

The absence of branched gills underneath and on the side of the thorax is a key difference distinguishing the Perlodes from the Perlidae genus.


I found this big Perlodes larvae under a stone in a cold and unpolluted alpine creek.


Perlodes are medium to large stoneflies, this one was 3 cm. including cerci and antemnas


Typical straight external border of the wing case of a perlodes (as opposed to the rounded ones of the Perlidae family)