| Singular | Plural | |||
|---|---|---|---|---|
| Caz | Articulat | Nearticulat | Articulat | Nearticulat |
| Nominativ | malacostraceea | malacostracee | malacostraceele | malacostracee |
| Acuzativ | malacostraceea | malacostracee | malacostraceele | malacostracee |
| Genitiv | malacostraceei | malacostracee | malacostraceelor | malacostracee |
| Dativ | malacostraceei | malacostracee | malacostraceelor | malacostracee |
| Vocativ | malacostracee | malacostraceelor | ||