Probable receptor for neuropeptide ligand nlp-9 that plays a role in octopamine signaling and specifically, the octapamine inhibition of aversion responses in olfactory sensory neurons (PubMed:22124329, PubMed:25009271). In AWB olfactory sensory neurons, required for the detection of preferred food sources (PubMed:25009271). Expressed in sensory neurons including ASER. Defective octopamine signaling characterized by reduced octopamine inhibition of the aversive response initiated by ASH sensory neurons when exposed to 100% 1-octanol (PubMed:22124329). RNAi-mediated knockdown results in an inability to distinguish between different food odors (PubMed:25009271). Belongs to the G-protein coupled receptor 1 family.