# Acmaeodera Tubulus

Acmaeodera tubulus, commonly known as a flat-headed hardwood borer, is a tiny and charismatic metallic wood-boring beetle native to North America. These beetles are easily recognized by their dark, cylindrical bodies adorned with distinctive yellow or orange speckles. Adults are highly active during warm, sunny spring and summer days, frequently seen visiting a wide variety of wildflowers to feed on pollen and nectar.

While the adults enjoy a diet of sweet blooms, their larvae play an important ecological role as decomposers. Larvae bore into the dead and decaying wood of various hardwood trees, such as oaks and hickories, helping to break down organic matter and recycle vital nutrients back into the forest soil. This species is a delightful find for any nature observer exploring sunlit forest edges.

- **Category:** [Insects](https://www.snappit.app/explore/categories/insect)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Snaps:** 1
- **Habitat:** Typically found in deciduous woodlands, forest edges, and adjacent fields where wildflowers and hardwood host trees are abundant.

![Acmaeodera Tubulus](https://inaturalist-open-data.s3.amazonaws.com/photos/49189711/medium.jpg)

Photo: Victor Engel, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/49189711)

## Appearance

This minuscule beetle measures between 0.5 to 0.8 centimeters in length, featuring a robust, cylindrical body shape. Its dorsal surface is a dark, metallic bronze or black, punctuated by a series of small, bright yellow or orange-red spots scattered across the elytra (wing covers). The elytra are fused along the midline, preventing them from opening during flight. Its thorax and head are heavily punctured, giving the beetle a textured, rugged appearance under close inspection.

## Taxonomy

- **Kingdom:** Animalia
- **Phylum:** Arthropoda
- **Class:** Insecta
- **Order:** Coleoptera
- **Family:** Buprestidae
- **Genus:** Acmaeodera

## Interesting facts

- Adults are highly thermophilic, meaning they are most active during the hottest parts of sunny days when other insects might seek shade.
- Because their elytra are fused, they cannot open them to fly; instead, they slip their flight wings out of the sides of their armor, looking like miniature jet fighters.
- Their larvae are called flat-headed borers due to the wide, flattened thorax that makes them look like they have an oversized head.

## Special abilities

- **Fused Elytra Flight:** Unlike most beetles, this species has fused wing covers and flies by extending its membranous hindwings from the sides without opening its elytra, enhancing aerodynamic efficiency.
- **Wood Boring Mandibles:** In its larval stage, it possesses strong, specialized mouthparts designed to chew through tough, decaying hardwood fibers.
- **Pollen-Mimicking Camouflage:** The yellow spots on its dark body help it blend in with the stamens and pollen of the flowers it visits, protecting it from predators.

## Diet & Feeding

Adults feed primarily on pollen and nectar from various wildflowers, while larvae feed on the dead wood of hardwood trees.

- **Age differences:** Larvae are wood-boring detritivores feeding on dead hardwood, whereas adults are florivorous, feeding on pollen and nectar.
- **Primary Foods:** Pollen, Nectar, Decaying oak wood, Decaying hickory wood
- **Foraging Method:** Foraging

## Ecological connections

- **Host plant:** [White Oak](https://www.snappit.app/explore/white-oak) (*Quercus alba*) — Larvae feed inside the dead branches and wood of this tree.
- **Mutualism:** [Wild Geranium](https://www.snappit.app/explore/wild-geranium) (*Geranium maculatum*) — Adult beetles feed on the pollen and nectar, occasionally acting as minor pollinators.
- **Eaten by:** [Downy Woodpecker](https://www.snappit.app/explore/downy-woodpecker) (*Dryobates pubescens*) — Woodpeckers forage on dead tree bark to extract and eat the wood-boring larvae.

## Safety

**Danger:** 1/5 · Very low

No special safety notes yet.

## Frequently Asked Questions

### How to identify Acmaeodera Tubulus?

Look for hard wing covers meeting in a line down the back, then compare the antennae, body shape, legs and markings. Metallic colors shift a lot with lighting. Beetle Identifier: upload a photo and compare the visible details.

### What does Acmaeodera Tubulus eat?

Adults feed primarily on pollen and nectar from various wildflowers, while larvae feed on the dead wood of hardwood trees.

### Where is Acmaeodera Tubulus usually found?

Typically found in deciduous woodlands, forest edges, and adjacent fields where wildflowers and hardwood host trees are abundant.

### How does Acmaeodera Tubulus hunt?

Foraging

## Where to spot

- [Lock and Dam No. 19](https://www.snappit.app/guides/places/lock-and-dam-no-19) — Illinois, US · Historic Site

## 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*)

---

Source: [Acmaeodera Tubulus: Facts & Places to See — Snappit](https://www.snappit.app/explore/acmaeodera-tubulus)