Alex Hyde / European cave spider (Meta menardi) on ceiling of cellar. Worcestershire, UK. April.

Alex Hyde / European Cave Spider (Meta menardi) in limestone cave. Plitvice Lakes National Park, Croatia. January.

Alex Hyde / Spider (Tegenaria sp.) in dew-covered web in limestone cave, Plitvice Lakes National Park, Croatia. January.

Alex Hyde / Egg sac of European Cave Spider (Meta menardi) suspended from roof of limestone cave. Plitvice Lakes National Park, Croatia. January.

Suzi Eszterhas / Psechrus spider (Psechrus sp) female carrying eggs, Gomantong Caves, Sabah, Malaysia

Piotr Naskrecki / Amblypygid (Paraphrynus sp) feeding on Spider Cricket (Mayagryllus apterus) prey in cave, Belize

Remi Masson / Giant cave spider (Heteropoda sp.) Sulawesi, Indonesia. One of the worlds largest spider with a leg span of 25 cm

Emanuele Biggi / Whip scorpion (Stygophrynus sp.), Deer Cave, Gunung Mulu National Park, Borneo, Sarawak, Malaysia.

Emanuele Biggi / Cave web spider (Psechrus borneo) female with egg sac, Gomantong caves, Borneo, Sabah, Malaysia.

Emanuele Biggi / Cave web spider (Psechrus borneo), Gomantong caves, Borneo, Sabah, Malaysia.

Alex Hyde / Cave spider probably (Mesostalita nocturna). This species is a true troglobite (living only in caves) and is highly adapted to the cave environment. Whilst it has no eyes, it is very sensitive to vibr...

Andy Sands / Cave spider (Meta bourneti) on inside lid of drain cover, London, England, UK, September