The carapace (

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The carapace of this Baetisca laurentina nymph is highlighted in green.

Carapace: A hard, protective shell on the back of an animal. In mayflies, this refers to the enlarged section of the mesonotum which forms the "humps" of Baetisca nymphs.) of this Baetisca laurentina nymph is highlighted in green.

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