Black Grain Stem Sawfly
Trachelus tabidus
This record describes Trachelus tabidus (species). Recorded family: Cephidae. Recorded order: Hymenoptera.
Identification and Appearance
Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Hymenoptera (Ants, Bees, Wasps and Sawflies)
- Family
- Cephidae (Stem Sawflies)
- Tribe
- Cephini
- Genus
- Trachelus
Imported taxonomy record. Source availability varies; see the source references and editorial policy below.
Habitat and Range
Geographic Range
native to Middle and Western Europe (northward to Germany), Asia Minor, Northern Africa (Egypt, Algeria). Introduced in NA and known from ne. US (NH-VA west to MI, OH)
Diet and Behavior
Diet: infests cultivated grains only
Life History
Monovoltine
Additional species information
Species notes from the sources
Etymology: Author: Fabricius, 1775
About Flies: the wider group
Order-level background for Hymenoptera, the group containing Trachelus tabidus. Species-specific details appear above.
Group overview
Hymenoptera includes over 150,000 described species of ants, bees, wasps, and sawflies. Earth harbors approximately 20 quadrillion (20×10^15) ants, with a combined biomass of ~12 megatons of dry carbon - exceeding the combined biomass of all wild birds and mammals (PNAS, 2022).
Ecological role of the group
About 35% of the world's food crops depend on animal pollinators. The chocolate industry, valued at over $100 billion, depends on pollinating flies and midges. Ants are the dominant soil engineers in most terrestrial ecosystems, turning more soil than earthworms in many habitats.
Economic and practical significance of the group
Pollinators contribute $235-577 billion worth of annual global food production (FAO). In the U.S., bee pollination alone benefits crops valued at $18 billion annually, and honey bees are responsible for $5.4 billion in agricultural productivity. Between April 2023-2024, 55.1% of managed honey bee colonies were lost. The U.S. bee population dropped from 5 million to 2.5 million.
Recorded sources for this group: FAO, USDA, EPA, PNAS (2022), US Fish & Wildlife Service. Imported estimates may describe particular regions or reporting periods.
Photos of Black Grain Stem Sawfly (3)
Photo credits: Contributed by v belov; Additional contributions by Beatriz Moisset
Frequently Asked Questions About Black Grain Stem Sawfly
Where is Black Grain Stem Sawfly found?
Range: native to Middle and Western Europe (northward to Germany), Asia Minor, Northern Africa (Egypt, Algeria). Introduced in NA and known from ne. US (NH-VA west to MI, OH)
What does Black Grain Stem Sawfly eat?
The diet of the Black Grain Stem Sawfly includes infests cultivated grains only.
What is the life cycle of a Black Grain Stem Sawfly?
Monovoltine