Enables protein tyrosine phosphatase activity. Predicted to be involved in protein dephosphorylation. Predicted to act upstream of or within negative regulation of neuron projection development; peptidyl-tyrosine dephosphorylation; and positive regulation of protein localization to plasma membrane. Predicted to be located in cytoplasm and neuron projection terminus. Orthologous to human PTPN9 (protein tyrosine phosphatase non-receptor type 9). [provided by Alliance of Genome Resources, Apr 2022]