The Royal Belgian Institute of Natural Sciences Crustacea collection contains 30806 digitised specimens over 1411 taxa (mostly species). This dataset only contains the marine species of the collection. The following classes are included: Arachnida, Branchiopoda Latreille, 1817, Clitellata, Gastropoda Cuvier, 1797, Hydrozoa Owen, 1843, Ichthyostraca Zrzavy et al., 1997, Insecta Linnaeus, 1758, Malacostraca Latreille, 1802, Maxillopoda Dahl, 1956, Merostomata, Ostracoda indet., Ostracoda Latreille, 1802, Pycnogonida Latreille, 1810, Secernentea, Sipunculidea.