Enables G protein-coupled serotonin receptor activity and serotonin binding activity. Acts upstream of or within response to toxic substance. Predicted to be located in plasma membrane. Predicted to be integral component of membrane. Predicted to be active in dendrite. Predicted to be integral component of plasma membrane. Is expressed in several structures, including alimentary system; central nervous system; eye; genitourinary system; and integumental system. Orthologous to human HTR1D (5-hydroxytryptamine receptor 1D). [provided by Alliance of Genome Resources, Apr 2022]