Nymph or Larvae?
Stemonitis sp slime mold

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What’s the difference between a nymph and a larva? For years, I’ve heard both terms but hadn’t given it much thought. This year, I started photographing insects earlier than I have in the past years and as I was trying to identify some of the grasshoppers, I noticed they didn’t have wings. Call it either an AHA! moment or a DUH! moment, or both – either way, I realized these were nymphs! I was hooked and I wanted to know more.

Nymphs and larvae are both immature insects; the difference is their life cycles.  Insects undergo one of 3 types of changes as they mature: 1) ametabolous metamorphosis, 2) hemimetabolous metamorphosis, or 3) holometablous metamorphosis. Depending on which type of maturing process the insects go through depends on what the immature insects are called.

A nymph is the immature stage of insects that mature via a process call hemimetabolous metamorphosis or incomplete metamorphosis. It means the babies generally look like the adults, only in a smaller version. They grow by molting and each molt is called an instar. The one exception is for dragonflies and damselflies; their nymphs are called naiads. Some of the insects that age using this process are grasshoppers, mayflies, and plant bugs. 

Green-legged Grasshopper nymph

Green-legged Grasshopper nymph

The remaining exoskeleton (aka exuviae) from a recent molt

The remaining exoskeleton (aka exuviae) from a recent molt

A larva is the immature stage of insects that mature via holometablous metamorphosis or complete metamorphosis. Larva are usually wormlike in appearance and have no resemblance to the adult they will become; we mostly refer to them as caterpillars. The grow by molting, eventually becoming a pupa, then the last molt is when the insect changes to the adult form. Some of the insects that age using this process are butterflies, beetles, and moths.

Larva (aka caterpillar) of a Salt Marsh Caterpillar

Larva (aka caterpillar) of a Salt Marsh Caterpillar

Salt marsh moth

Salt marsh moth

Lastly, is ametabolous metamorphosis. This is where the insect grows to adulthood with little change in body form. If you’ve ever wondered how aphids can accumulate so quickly, this is why – they give birth to live young who can reproduce in a matter of days. The photo to the right shows aphids of all ages on a single plant stem

I’m grateful that my curiosity kicked in! I was much more familiar with the larva term than I was the nymph term…at least until I met Jim. We now both do “nymphing” — his is with a fly rod and mine is with a camera!

 

 

Aphids of all ages on a single plant stem

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