Macropeza

Macropeza is a genus of small flies belonging to the family Ceratopogonidae, commonly known as biting midges or no-see-ums. Flies within the Macropeza genus are characterized by their distinctive morphological features and specific ecological roles, primarily as predators in aquatic or semi-aquatic environments.

Description:

Macropeza species are typically small, often ranging from 1 to 3 millimeters in length. Like other ceratopogonids, they possess a humped thorax and relatively long legs. They can be difficult to identify to species level without microscopic examination of the genitalia or other specific morphological features. Key identifying characteristics often involve the wing venation, shape of the flagellomeres, and the structures of the male and female reproductive organs. Their color varies, but many are dark brown or black.

Habitat and Distribution:

Macropeza flies are found globally in suitable habitats. Larvae are often found in various aquatic environments, including marshes, swamps, bogs, and the margins of streams and ponds. Specific habitat preferences can vary depending on the species.

Life Cycle:

The life cycle of Macropeza involves four stages: egg, larva, pupa, and adult. The eggs are typically laid in or near water. The larvae are aquatic and predaceous, feeding on other small insects and invertebrates. Pupation occurs in the water. Adult flies emerge and are capable of flight.

Ecological Role:

Macropeza larvae play an important role as predators in aquatic ecosystems, helping to regulate populations of other small invertebrates. Adult Macropeza flies do not typically feed on blood like some other ceratopogonids, and therefore are generally not considered pests of humans or livestock.