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Dragonfly nymph 3rd Instar Aeshna palmata - dorsal view

 
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svalley



Joined: 03 Dec 2006
Posts: 287
Location: Albany, Oregon

PostPosted: Mon Mar 12, 2018 4:44 pm    Post subject: Dragonfly nymph 3rd Instar Aeshna palmata - dorsal view Reply with quote

A dorsal view of a 3rd instar nymph of the dragonfly Aeshna palmata. This is the same nymph that was shown in http://www.photomacrography.net/forum/viewtopic.php?t=36700

Note the tubercle behind each eye. In the 3rd instar it has gained another spine. There is some speculation that it may have a sensory function to make up for the lack of well developed eyesight in the early instars.



A 100% crop of the tubercle.



Shot with a Nikon D810, Mitutoyo 20x M Plan mounted on a Micro-Nikkor 200mm, Flash (transmitted light), ISO 64, f5, 207 frames stacked with Zerene PMax.
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MarkSturtevant



Joined: 21 Nov 2015
Posts: 332

PostPosted: Tue Mar 13, 2018 6:32 am    Post subject: Reply with quote

Interesting sensory hairs on those tubercles behind the eyes. They are against a projection of cuticle, which I suppose means they can't be bent backwards.
Living in dimly lit water, I suppose it would be useful to have sensory projections to help the critter navigate past obstructions. Kind of like whiskers on a nocturnal mammal.
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