Aquatic Insect #1 ID?

Taxon

Moderator
Staff member
#1


This aquatic insect is common in WA. Can you identify it by any of the following?

  • Order common name: (Caddisfly, Mayfly, Stonefly, True Fly, etc.)
  • Order taxonomic name: (Trichoptera, Ephemeroptera, Plecoptera, Diptera, etc.)
  • Family common name:
  • Family taxonomic name:
  • Genus common name:
  • Genus taxonomic name:
  • Species taxonomic name:
  • Lifestage:
  • Sex:
 

Taxon

Moderator
Staff member
#3
Perlodidae
Skwala
Stonefly
Nymph stage
Male - cuz of short wing?

Just a guess.
My boss asked what the heck I am doing.
Hi Mark Yoshida-

Welcome to the party. Yes, it's the nymphal lifestage of an aquatic insect. And yes, it's a male, but not for the reason given. However, it's not stonefly, so it can't be of family Perlodidae, nor can it be of genus Skwala.

IDENTIFICATIONS
  • Order common name: (Caddisfly, Mayfly, Stonefly, True Fly, etc.)
  • Order taxonomic name: (Trichoptera, Ephemeroptera, Plecoptera, Diptera, etc.)
  • Family common name:
  • Family taxonomic name:
  • Genus common name:
  • Genus taxonomic name:
  • Species taxonomic name:
  • Lifestage: Nymph (Mark Yoshida)
  • Sex: Male (Mark Yoshida)
 

Taxon

Moderator
Staff member
#7
It's a mayfly, and I'm guessing in the family baetidae?
Hi twkk-

Yes to both mayfly and family Baetidae.

IDENTIFICATIONS
  • Order common name: Mayfly (twkk)
  • Order taxonomic name: (Trichoptera, Ephemeroptera, Plecoptera, Diptera, etc.)
  • Family common name:
  • Family taxonomic name: Baetidae (twkk)
  • Genus common name:
  • Genus taxonomic name:
  • Species taxonomic name:
  • Lifestage: Nymph (Mark Yoshida)
  • Sex: Male (Mark Yoshida)
 

Taxon

Moderator
Staff member
#8
Hi Patrick Gould-

Yes, its common name is Blue-Winged Olive (BWO). Yes, it is of genus Baetis. No, it is not of species bicaudatus. Look closer. ;)

IDENTIFICATIONS
  • Order common name: Mayfly (twkk)
  • Order taxonomic name: Ephemeroptera (Taxon)
  • Family common name: Small Minnow (Taxon)
  • Family taxonomic name: Baetidae (twkk)
  • Genus common name: Blue-Winged Olive (BWO)
  • Genus taxonomic name: Baetis (Patrick Gould)
  • Species taxonomic name:
  • Lifestage: Nymph (Mark Yoshida)
  • Sex: Male (Mark Yoshida)
 

Taxon

Moderator
Staff member
#11
Male because of eyes size and front leg length?
Yes, definitely because of the eyes on this mature nymph, which is close to emerging based on its dark wingpads. However, only the imago (spinner) mayfly lifestage has extremely long forelegs, which are used to hold its female partner during copulation.
 

Taxon

Moderator
Staff member
#12
Yes, Baetis tricaudatis. Very good, Patrick. :)

For others reading this, bicaudatis refers to only two caudal filaments (tails), whereas tricaudatis refers to three caudal filaments. The middle tail of this nymph, which is approximately 75% as long as the outer two, is so close in color to that of the background, as to be it difficult to see in the photo, unless one looks really closely.

  • Order common name: Mayfly (twkk)
  • Order taxonomic name: Ephemeroptera (Taxon)
  • Family common name: Small Minnow (Taxon)
  • Family taxonomic name: Baetidae (twkk)
  • Genus common name: Blue-Winged Olive (BWO)
  • Genus taxonomic name: Baetis (Patrick Gould)
  • Species taxonomic name: tricaudatus (Patrick Gould)
  • Lifestage: Nymph (Mark Yoshida)
  • Sex: Male (Mark Yoshida)
 

jwg

Active Member
#15
I had no idea a BWO species could be that large!

I am enjoying this this flyfishing entomology

please keep up the challenges!
 

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