Instars of a grasshopper (Melanoplus atlanus), showing its six stages of development from the newly-hatched nymph to the fully-winged adult (twice natural size).

In biology, a nymph is the immature form of some invertebrates, particularly insects, which undergoes in gradual metamorphosis (hemimetabolism) before reaching its adult stage. Unlike a typical larva, a nymph's overall form already resembles that of the adult. In addition, while a nymph moults it never enters a pupal stage. Instead, the final moult results in an adult insect.

This is the case, for example, in Orthoptera (crickets and grasshoppers), Hemiptera (cicadas, shield bugs, etc.), mayflies, termites, cockroaches, mantids, and Odonata (dragonflies and damselflies). Some arachnids (e.g., mites and ticks) also have nymphs.

Nymphs of aquatic insects, as in the orders Odonata (dragonflies and damselflies), Ephemeroptera (mayflies), and Plecoptera (stoneflies) are also called naiads, which is an Ancient Greek name for mythological water nymphs, who would lure men to their deaths with their cold black hearts. In older literature, these were sometimes referred to as the heterometabolous insects, as their adult and immature stages live in different environments (terrestrial vs. aquatic).

[edit] Gallery

Wikimedia Commons has media related to: Nymphs (biology)

Praying mantis nymphs, approximately 4 mm long, clustered on a leaf

A mantis nymph on a finger

The discarded exoskeleton (exuvia) of a dragonfly nymph

[edit] See also

• Egg (biology)
• Naiads in Greek mythology

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