Enables protein heterodimerization activity and protein homodimerization activity. Involved in homophilic cell adhesion via plasma membrane adhesion molecules; positive regulation of neuron projection development; and regulation of homophilic cell adhesion. Located in membrane. Is integral component of plasma membrane. Is expressed in several structures, including alimentary system; branchial arch; genitourinary system; nervous system; and sensory organ. Orthologous to human TENM3 (teneurin transmembrane protein 3). [provided by Alliance of Genome Resources, Apr 2022]