Unidentified Naiads and Exuviae

Larvae, Nymphs

aquatic: ponds, swamps, streams.

All naiads are voracious predators feeding on everything from small invertebrates such as mosquito larvae to smaller vertebrates such as fish and frogs.

From the University of Florida:

Immature odonates are sometimes referred to as larvae or nymphs, but here will be referred to as naiads since they are wholly aquatic hemimetabolis insects as immatures (that is they do not have a pupal stage like beetles and butterflies). Naiads live in most aquatic habitats. Some can even survive in salt water (Corbet 1999). All naiads are voracious predators feeding on everything from small invertebrates such as mosquito larvae to smaller vertebrates such as fish and frogs.

Naiads will molt nine to 17 times before becoming an adult (Corbet 1999). The number of generations per year depends on the species of odonate. Species at higher altitudes or in dry environments usually have one generation per year while those in tropical habitats may undergo multiple generations per year depending on the availability of appropriate habitats.

When naiads are ready for their final molt they leave the water and crawl onto the bank or vegetation where they will molt into adults. Much like a caterpillar emerging from a chrysalis, they will need to pump up their wings and allow their bodies to harden before they can be effective fliers. A newly emerged odonate is teneral (soft). A teneral dragonfly has glossy wings and the colors on the body are often pale. Several days after emmerging hardened completely and will have taken on the colors of an adult dragonfly.

With their forked tail, superfically, damselfly naiads can resemble mayfly nymphs.

Here's a mayfly larva:

...and a damselfly naiad:

University of Puget Sound has images of Lamellae/gills of many NC/SC and Eastern US species.

University of Florida has general info and images.