The spiders of the Iberian Peninsular take on many forms, the most fun looking ones are perhaps the Jumping Spiders (Salticidae) which are very small and are quite agile as their name suggests. One of the brightest of this form is scarlet and black but only about 4mm in size. Another family of spiders that are easy to observe and have bright colours are the Crab Spiders (Thomisidae species), which usually take on the colour of flower petals and sit quietly, well camouflaged and wait for a bee etc to land.
One of the larger spiders indigenous to Spain is the Wolf Spider (Lycosa tarantula) which lives in burrows in the ground, hunting its prey by night. Another is the Andalusian Funnel Web Spider (Macrothele calpeiana) which receives European level protection. This one can give a painful but not serious nip as does the Mediterranean Black Widow (Latrodectus tredecimguttatus) found in Valencia and Andalucia.

There are five types of Scorpion indigenous to the Iberia peninsular, the most common in the south being the Spanish Yellow Scorpion (Buthus occitanus). In 2004 two new Buthus species were described in Iberia: Buthus ibericus and Buthus montanus. (These scorpions were previously classified as Buthus occitanus).
The European Black Scorpion (Euscorpius flavicaudis) inhabits the more northerly parts of Spain preferring wetter areas, whereas the small rare, cave dwelling Belisarius xambeui can only be found in the Catalonian Pyrenees.
The Euscorpius balearicus is a species endemic to the Balearic Islands.

Introduced species:
Florida bark scorpion (Centruroides gracilis), from South American, has been listed in the Canary Islands.
Lesser brown scorpion (Isometrus maculatus), which has been noted on the coast of Huelva (Atlantic south west coast of Andalusia), was accidentally brought across from America.

There are various forms of centipede and millipede, from the peculiar Long Legged Centipede (Scutigera Coleoptrata) to the much larger, poisonous, Megarian Banded Centipede (Scolopendra cingulata). Sizeable groups of millipedes will collect together under rocks.