Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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Definition of 'prothorax'
Definition of 'prothorax'
Prothorax: The frontmost of the three segments of an insect's thorax, to which its front pair of legs are attached.
This other word references the same concept: prothoracic.
The prothorax of this Ephemerella subvaria (Hendrickson) nymph is highlighted in red.
This other word references the same concept: prothoracic.