- Kingdom: Animalia
- Phylum: Mollusca
- Class: Polyplacophora
- Order: Chitonida
- Family: Callochitonidae
- Scientific name: Callochiton septemvalvis
- Norwegian: flekket leddsnegl
The C. septemvalvis can usually easily recognized by the white ribbons in each corner of the shell. Older individuals get more ribbons until they frame the entire shell. Juveniles often have a bright red color, but often change to orange or even green or brown, on adults.
This chiton can grow to a length of 32 mm. The wide mantle is densely packed with cigar shaped spicules. The shell is making up about 60% of the animals width. The valves are tall and have a distinct keel.
It thrives on rocky substrate, usually on shallow water, but has been registered as deep as 500 meters. It is often seen on rocks with sheets of red algae.
All Atlantic coasts of Europe from Nordland, Norway in the north to the Mediterranean and the Red Sea in the south.