Zwart knuppeltje
VU

Zwart knuppeltje

Physocephala nigra

Unknown

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Physocephala_nigra

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Physocephala nigra faces significant population declines primarily due to habitat loss from agricultural intensification and urbanization across its European range. The species' specialized parasitic lifestyle, requiring specific host flies and particular microhabitat conditions, makes it especially vulnerable to environmental changes. Climate change may further disrupt the delicate timing between this thick-headed fly and its dipteran hosts, while pesticide use in agricultural areas directly impacts both the species and its prey base.

Threat summary

Habitat

Physocephala nigra inhabits semi-natural grasslands, meadows, and woodland edges across Europe, particularly favoring areas with abundant flowering plants that support diverse dipteran communities. The species requires specific microhabitats that support both adult feeding opportunities and suitable host flies for its parasitic larval stage.

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Frequently asked questions

Why is Zwart knuppeltje classified as Vulnerable?
Zwart knuppeltje is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Physocephala nigra faces significant population declines primarily due to habitat loss from agricultural intensification and urbanization across its European range. The species' specialized parasitic lifestyle, requiring specific host flies and particular microhabitat conditions, makes it especially vulnerable to environmental changes. Climate change may further disrupt the delicate timing between this thick-headed fly and its dipteran hosts, while pesticide use in agricultural areas directly impacts both the species and its prey base.
Where does Zwart knuppeltje live?
Zwart knuppeltje occurs in Åland Islands, Austria, Denmark, Finland, France, and Germany (plus 7 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Zwart knuppeltje?
The main threats to Zwart knuppeltje are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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