Developed an ontology extension for the obophenotype/cell-ontology repository, focusing on the representation of stomatogastric ganglion neuron types in crabs and lobsters. This work involved adding new cell type definitions and detailed ontology annotations, leveraging expertise in bioinformatics, data modeling, and ontology development using OWL. The implementation included updates to import statements and taxonomic classifications, ensuring consistent cross-species annotation and improved data integration. By enabling downstream annotation for crustacean gastric mill and pyloric neuron datasets, the contribution enhanced the repository’s capacity to support comparative neurobiology research and facilitated more robust integration of diverse biological data sources.