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Baetisca (Armored Mayflies) Mayfly Nymph Pictures

 I've only got blurry pictures of this small Baetisca nymph, because it was zooming around the container in a frenzy. Several characteristics, if taken literally, suggest that it may be Baetisca lacustris. However, it's very small and it's the only candidate lacustris I collected among several laurentina specimens, so it's possible this is just an underdeveloped early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) laurentina.

This mayfly was collected from unknown on January 14th, 2004 and added to Troutnut.com on January 25th, 2006.

Video Clip

Swimming Baetisca Mayfly Nymph
The clumsy-looking mayfly nymphs of the genus Baetisca are surprisingly good swimmers.
Date ShotJan 31, 2004
Date AddedMar 31, 2006
AuthorTroutnut

Pictures

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Here you can see the frontal projection on the head is not very well-developed.  Baetisca (Armored Mayflies) Mayfly Nymph from unknown in Wisconsin
Here you can see the frontal projection on the head is not very well-developed.
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Baetisca (Armored Mayflies) Mayfly Nymph from unknown in Wisconsin
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This view shows that the dorsal projections do not extend above the height of the mid-dorsal hump.  Baetisca (Armored Mayflies) Mayfly Nymph from unknown in Wisconsin
This view shows that the dorsal (Dorsal: Top.) projections do not extend above the height of the mid-dorsal (Dorsal: Top.) hump.
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Same nymph as above, different view. This angle also slightly shows the brown median line on the bottom of the back of the abdomen, another characteristic of B. lacustris.  Baetisca (Armored Mayflies) Mayfly Nymph from unknown in Wisconsin
Same nymph as above, different view. This angle also slightly shows the brown median line on the bottom of the back of the abdomen, another characteristic of B. lacustris.

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