Cuterebra refers to a type of bot fly, and its appearance varies depending on its life stage and the visible manifestation of its presence. Most commonly, what people observe is the characteristic lesion caused by the larval stage, often called a "warble," which is found under an animal's skin.
The Cuterebra Warble (Lesion)
When a Cuterebra larva resides beneath the skin, it creates a distinct, visible swelling or bump.
- Size: This bump typically measures ½ to 1 inch in diameter.
- Shape: It has a unique appearance, often described as resembling a volcano. It features a perfectly round hole at its top, which serves as a breathing pore for the larva.
- Discharge: A small amount of discharge may be present and visible coming out of this central opening. The skin surrounding the warble can sometimes appear inflamed or irritated.
The Cuterebra Larva (Maggot)
If the larva emerges or is otherwise visible, it has a distinct look:
- Shape: It is a large, grub-like maggot.
- Color: Younger larvae are typically creamy white, but as they mature and grow, they often darken, becoming grey, brown, or even black.
- Texture: Their bodies are usually covered in rows of small, dark spines, which help them secure their position within the host's tissue.
The Adult Cuterebra Fly
The adult Cuterebra fly, while less commonly seen, is a robust insect:
- Size: These are relatively large flies.
- Appearance: They are often quite hairy and can resemble bumblebees in their general shape and fuzzy body, though they are true flies.
- Behavior: Adult Cuterebra flies do not feed and are not known to bite. Their primary role is reproduction.
