They belong to the phylum Arthropoda, the subphylum Myriapoda, the suborder Chilopoda, and the order Scolopendromorpha.
The most common species in Greece is the 

Scolopendra cingulata.

Description:
The body of the centipede is long and agile, consisting of 21 identical segments from which an equal number of pairs of jointed legs emerge. The first pair has been transformed into jaw-shaped hooks from which venom is secreted. On the sides of the head there are four eyes and on the top a pair of antennae.
Biology:
Centipedes are widespread in temperate and tropical regions, living in moist soils, usually hidden under stones. They move quickly on the ground and feed on insects, larvae and other arthropods, mainly at night. Females lay 15-60 eggs which they place in the soil or on rotten wood, caring for and protecting them from fungi. In some species, the female remains with the offspring until they are ready to leave.
Relationship with man:
Some species of centipedes can inflict painful bites with their powerful jaws, while generally causing fear in humans.
Treatment:
Although they do not develop large populations like millipedes, they can cause problems when they enter homes. If necessary, a residual spraying of a crawling insect insecticide around the building is recommended. A good application of insecticide in the spring to control insects in general will also keep the building free of centipedes.