#3845 · 🪰 flies & mosquitoes
Hawthorn Fly
🇳🇱 Maartse vlieg ·Bibio marci
🪰 Flies & mosquitoes 📍 in the Netherlands
📍 Hellevoetsluis, Nederland
📍 Wageningen, Netherlands
📍 Noordwijk, Nederland
📍 Lexmond, Utrecht, NL
📍 Noordwijkerhout, Nederland
📍 Noordwijk, Nederland
📍 4384 Vlissingen, Nederland
10 photos from iNaturalist (Creative Commons) · credits & licences
- 1. © Björn Sothmann · CC BY-SA 4.0
- 2. © Wildlife in a Dorset garden · CC BY-NC-SA 4.0
- 3. © Laurence Livermore · CC BY-NC 4.0
- 4. Hellevoetsluis, Nederland:© Michel Langeveld · CC BY 4.0
- 5. Wageningen, Netherlands:© no rights reserved · CC0
- 6. Noordwijk, Nederland:© Michel Langeveld · CC BY 4.0
- 7. Lexmond, Utrecht, NL:© no rights reserved · CC0
- 8. Noordwijkerhout, Nederland:© Michel Langeveld · CC BY 4.0
- 9. Noordwijk, Nederland:© Michel Langeveld · CC BY 4.0
- 10. 4384 Vlissingen, Nederland:© levi · CC BY-NC 4.0
what is it?
Bibio marci or St. Mark's fly is a fly from the family Bibionidae. Their common name comes from the fact that the adults usually emerge around St Mark's Day, 25 April.
base stats
Bars compare against all animals on log scales: up to 300,000 Dutch and 600,000 worldwide sightings (the most-seen species), 150 t (blue whale), 30 m and 400 years (Greenland shark).
fun facts
- Spotted 68 times in the Netherlands on iNaturalist.
- 16,994 observations worldwide on iNaturalist.
- Scientifically named in 1758 (268 years ago).
fact sheet
- English
- Hawthorn Fly
- Nederlands
- Maartse vlieg
- scientific name
- Bibio marci
- class
- Insecta
- order
- Diptera
- family
- Bibionidae
- sightings in NL
- 68
- sightings in Europe
- 4,281
- sightings worldwide
- 16,994
- GBIF records in NL
- 1,173
- weight
- —
- length
- —
- lifespan
- —
- named
- 1758
relatives· Bibionidae
Sources: iNaturalist taxon 56096, Wikidata Q1304179, GBIF 1590998, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.