Macrocera

Meigen, 1803

predatory fungus gnats

Species Guides

4

Macrocera is a of predatory fungus gnats in the Keroplatidae, containing at least 190 described . Species within this genus exhibit diverse : some inhabit caves with larvae that construct prey-capture webs, while others develop in decaying wood where larvae feed on fungal mycelia. The genus demonstrates considerable ecological plasticity across its members.

Macrocera inconcinna by no rights reserved, uploaded by Ken Kneidel. Used under a CC0 license.Macrocera nebulosa by (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block. Used under a CC-BY license.Macrocera by (c) Steve Kerr, some rights reserved (CC BY), uploaded by Steve Kerr. Used under a CC-BY license.

Pronunciation

How to pronounce Macrocera: /ˌmæk.roʊˈsɪə.rə/

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Identification

Members of Macrocera can be distinguished from other Keroplatidae by their relatively large body size and elongated compared to related fungus gnat . Specific identification to level requires examination of wing venation patterns and male genitalia.

Images

Habitat

varies considerably among . Some species occur in caves, where larvae develop exclusively in the dark zone. Other species inhabit decaying wood in moist forest environments. At least one species has been documented in both forest and cave settings.

Distribution

Documented from caves in Oklahoma, Missouri, Kentucky, Tennessee, and West Virginia, USA; forests in New Hampshire and Massachusetts, USA. GBIF records indicate presence in Denmark, Norway, and Sweden. The is likely more widely distributed given its .

Seasonality

Seasonality appears variable among . Macrocera anglica shows development with in spring. Macrocera nobilis exhibits continuous, non-seasonal and development in cave environments.

Diet

Larvae of some are predatory, capturing insect prey (primarily other Diptera) using silken webs. Larvae of other species feed on fungal mycelia.

Life Cycle

includes , larval, pupal, and stages. Larval duration varies: 9-10 months in Macrocera nobilis; four instars reported in Macrocera anglica. Pupal stage lasts approximately 2 weeks in Macrocera nobilis.

Behavior

Larvae construct silken webs or tubes. In cave-dwelling , these webs are used for locomotion and prey capture. In wood-inhabiting species, silken structures provide protection during feeding on fungal substrates. are short-lived.

Ecological Role

Predatory function as of other insects in cave . Fungivorous species contribute to wood decomposition and nutrient cycling in forest .

Sources and further reading