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Uroctea durandi
Uroctea durandi is a Mediterranean spider of about 16mm, dark with five yellow spots on its back. From each of the six openings two signaling threads protrude; When an insect or millipede touches one of these threads, the spider lunges out of the respective opening and catches its prey (Wikipedia).
It lives under rocks, where it constructs an upside-down tent-like hanging web about 4 cm in diameter (Wikipedia).
Found this little spider on a tree trunk, on the Peneda-Gerês National Park.