Danish arachnologist hunting down every single species of Danish spider.
Around 2021 I started dreaming about making spider identification more easy for ordinary people, and I realized that starts with good photos taken without disturbing elements (white background), combined with confirmation from genital examination. Since I started taking photos this way, I can see that several other spider enthusiasts have started doing it as well now. The trend is spreading which is absolutely great. Lets get every male and female of described species here on iNat on a white background!

I have a masters degree in biology from The University of Copenhagen. My master thesis was on crab spiders' sensory biology with a special emphasis on their vision.
North European crab spiders and their habitus is my strong suit. Currently looking in to each Danish species development, and documenting the juveniles. Turns out many of the species juvies are quite characteristic.

I work as a biodiversity consultant in my own company with a special focus on spider diversity assesments. Many of the photos I upload here are linked to those assignments.

Sometimes i do spider/field expeditions abroad -

• (Completed) Tanzania/Udzungwa July-August 2019
• (Completed) Australian east coast february-april 2023
• (Completed) Nepal August-September 2023
• (Completed) Singapore + West Peninsular Malaysia & Penang 2025
• (Planning) Costa Rica
• (Planning) Western Australia
• (Planning) New Caledonia

Want more spiders than seen here? - Follow me on insta @fff_macro

--Good spider links for the beginner---
Distribution maps, pictures and genital drawings:
https://araneae.nmbe.ch
The british arachnological society has species descriptions, and a tonne of other cool stuff
https://britishspiders.org.uk/
Great genital pictures of all common european spiders, opiliones, and pseudoscorpions
https://arachno.piwigo.com/
The german atlas project (with distribution maps and similar)
https://atlas.arages.de/?family=42
Massive Cellar spider (family: Pholcidae) project!
http://www.pholcidae.de/
The german spider-wiki, is packed with information, and works perfectly with google translate, if you aren't good at german!
https://wiki.arages.de/index.php?title=Hauptseite
Cool SEM images of a selected band of European spiders:
http://www.spiders.jeremypoolesem.org.uk/index.htm#species

Amazing gallery of Swedish spiders:
https://pbase.com/d_andersson/spindlar

Thomisid guide of Scandinavia:
https://www.inaturalist.org/guides/16746

New species and cool discoveries in Denmark - I've found or helped in finding/determining:

Araneae

• Pistius truncatus - Rediscovered after 105 years. It had been removed from the Danish species list.
• Tetragnatha dearmata - Rediscovered after 69 years.
• Alopecosa taeniata
• Zilla diodia - first confirmed natural population
• Dysdera erythrina
• Synageles hilarulus
• Neon valentulus
• Talavera parvistyla
• Xysticus lineatus
• Episinus truncatus
• Cheiracantium punctorium
• Sardinidion blackwalli
• Parasteatoda tabulata
• Scytodes fusca - First breeding population
• Philodromus rufus - First evidence of breeding population
• Thanatus vulgaris - Joint effort
• Scytodes "univittata" - Joint effort with Nikolaj Scharff

Pseudoscorpiones

• Mesochelifer ressli

Hemiptera

• Closterotomus trivialis

Coleoptera

• Otiorhynchus veterator - Initially misidentified in 2020, Mathias Holm found the same popoulation again i 2024, and determined it to be the new species rather than what I had initially ID'ed.

Fungi

• Engyodontium aranearum - Joint effort with Mattis Aksel Sylvest

Psocodea

• Dorypteryx longipennis

Hymenoptera

• Monoctenus obscuratus
• Microterys seyon - But i would never have known without seeing that Jonas Lutz and Peter Bonde had identified it secondarily

Introductions:

• Olios argelasius (Araneae) - Joint effort
• Macaroeris nidicolens (Araneae)
• Steatoda paykulliana (Araneae) - Joint effort
• Icius hamatus (Araneae) - Joint effort