Predicted to enable excitatory extracellular ligand-gated monoatomic ion channel activity and transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential. Predicted to be involved in excitatory postsynaptic potential and monoatomic ion transmembrane transport. Predicted to be located in neuron projection and synapse. Human ortholog(s) of this gene implicated in irritable bowel syndrome. Is an ortholog of human HTR3A (5-hydroxytryptamine receptor 3A) and HTR3E (5-hydroxytryptamine receptor 3E).