# Elm Finger Gall Mite (*aceria parulmi*)

The Elm Finger Gall Mite is a tiny creature that lives on elm trees. It creates interesting galls that look like little fingers on the leaves!

- **Category:** [Insects](https://www.snappit.app/explore/categories/insect)
- **Rarity:** Common
- **Danger:** 0/5 · No known danger
- **Habitat:** Elm trees in forests and urban areas.
- **Also known as:** Elm Gall Mite, Finger Gall Mite

![Elm Finger Gall Mite](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Aceria_parulmi.jpg&width=800)

Photo: Clay, CC BY 4.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Aceria_parulmi.jpg)

## Appearance

The Elm Finger Gall Mite is a microscopic, pale yellowish-white creature, so tiny it's barely visible to the naked eye. It has a distinctive worm-like body and only two pairs of short legs located near its head, making it unique among mites.

## Taxonomy

- **Kingdom:** Animalia
- **Phylum:** Arthropoda
- **Class:** Arachnida
- **Order:** Trombidiformes
- **Family:** Eriophyidae
- **Genus:** Aceria

## Interesting facts

- A single elm leaf can host hundreds of these almost invisible mites living inside their tiny 'finger' homes!
- Despite their name, these mites are not true insects; they're actually tiny arachnids!
- Elm trees don't really mind these mites; the galls usually don't hurt the tree much!
- These mites have only four legs, which is half as many as most other mites have!

## Special abilities

- **Gall Architect:** Elm Finger Gall Mites can create protective finger-like galls on elm leaves because they inject chemicals that make the plant grow shelter.
- **Tiny Dweller:** Elm Finger Gall Mites have an extremely small size that helps them remain hidden from predators and harsh weather inside plant tissues.
- **Plant Whisperer:** Elm Finger Gall Mites can manipulate elm tree cells using special chemicals, guiding the plant to grow their safe, food-filled homes.

## Measurements & details

- **Size:** 0.1-0.2 mm
- **Lifespan:** 30-60 days
- **Leg Count:** 4
- **Colony Size:** 100-500

## Diet & Feeding

These tiny mites feed on the sap and cells of elm tree leaves inside their protective galls.

- **Primary Foods:** elm leaf sap, elm leaf cells, plant juices
- **Foraging Method:** Foraging

## Ecological connections

- **Parasitizes:** [American Elm](https://www.snappit.app/explore/american-elm) (*Ulmus americana*) — Manipulates host cells to form protective galls.
- **Eaten by:** Predatory Mite (*Typhlodromus pyri*) — Predatory mites sometimes feed on unshielded gall mites.
- **Eaten by:** Green Lacewing (*Chrysoperla carnea*) — Larvae may prey on mites found outside their galls.

## Traits

- [Social](https://www.snappit.app/explore/traits/social): Social animals live in organized groups, cooperating for survival benefits such as foraging, defense, and raising offspring.
- [Arboreal](https://www.snappit.app/explore/traits/arboreal): Arboreal animals live primarily in trees, utilizing them for shelter, food, and protection from predators.
- [Herbivorous](https://www.snappit.app/explore/traits/herbivorous): This trait characterizes organisms whose diet consists entirely or primarily of plant material.
- [Decomposer](https://www.snappit.app/explore/traits/decomposer): Describes organisms that break down dead organic material, recycling nutrients back into the ecosystem.
- [Forest](https://www.snappit.app/explore/traits/forest): Forest habitats are terrestrial environments dominated by dense tree cover, supporting a high diversity of plant and animal life.

## Collections

- [Insects](https://www.snappit.app/explore/collections/insects)

## Safety

**Danger:** 0/5 · No known danger

No special safety notes yet.

## Frequently Asked Questions

### How to identify Elm Finger Gall Mite?

Look for six legs, antennae, three body sections and the shape of the wings. Beetles have hardened front wings; flies have just one working pair. Tiny insects may need a close view before their group is clear. Insect Identifier: upload a photo and compare the visible details.

### How big is Elm Finger Gall Mite?

0.1-0.2 mm

### How long does Elm Finger Gall Mite live?

30-60 days

### What does Elm Finger Gall Mite eat?

These tiny mites feed on the sap and cells of elm tree leaves inside their protective galls.

### Where is Elm Finger Gall Mite usually found?

Elm trees in forests and urban areas.

### How does Elm Finger Gall Mite hunt?

Foraging

### How many legs does Elm Finger Gall Mite have?

4

### How large are Elm Finger Gall Mite colonies?

100-500

## Where to spot

- [Surrey Square Park](https://www.snappit.app/guides/places/surrey-square-park) — Virginia, US · Park

## More Insects

- [Common Eastern Bumble Bee](https://www.snappit.app/explore/common-eastern-bumble-bee) (*Bombus impatiens*)
- [Spotted Lanternfly](https://www.snappit.app/explore/spotted-lanternfly) (*Lycorma delicatula*)
- [Brown-belted Bumble Bee](https://www.snappit.app/explore/brown-belted-bumble-bee) (*Bombus griseocollis*)
- [Eastern Carpenter Bee](https://www.snappit.app/explore/eastern-carpenter-bee) (*Xylocopa virginica*)

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Source: [Elm Finger Gall Mite: Facts & Places to See — Snappit](https://www.snappit.app/explore/elm-finger-gall-mite)