- Kingdom: Animalia
- Phylum: Arthropoda
- Subphylum: Crustacea
- Class: Malacostraca
- Subclass: Eumalacostraca
- Superorder: Eucarida
- Order: Decapoda
- Suborder: Pleocyemata
- Infraorder: Anomura
- Superfamily: Galatheoidea
- Norwegian: trollhummer
Characteristics:
Squat lobsters are usually found on relatively shallow water, hiding in crevices and under stones. They use their abdomen to swim backwards. The carapace (body) is longer than wide. Juveniles are often very difficult to identify from pictures alone.
Taxonomy:
A single family, Galatheidae, is dominating among the Norwegian squat lobsters. Eight species of this family are regularly encountered by divers along the coast of Norway. A few species of porcelain crabs, Porcellanidae, are also registered in Norway.