Crustaceological is a technical term which refers to the study of crustaceans, a family of arthropods that includes crabs, lobsters, shrimp, and barnacles. If you're looking for synonyms for this term, you may want to consider words that relate to the broader realm of marine biology. Some options might include "marine invertebrate study," "shellfish science," or "oceanic arthropod research." Alternatively, you could look for synonyms that focus more specifically on certain types of crustaceans. For example, "crab biology," "lobster anatomy," or "prawn physiology" might all be considered synonyms for crustaceological, depending on the exact context and focus of the study.