G-protein coupled receptor (GPCR) that forms a heterodimer with daf-38 to control dauer formation and behavior (PubMed:22665789, PubMed:23509272). Receptor for the ascaroside pheromone ascr#2 (PubMed:22665789). Required for the response to dauer inducing pheromones, specifically the ascaroside ascr#2 (PubMed:22665789, PubMed:23509272). May serve neuronal specific roles in response to ascr#2 with expression in ASI neurons controlling dauer formation in larvae, and expression in ASK neurons playing a role in longevity and hermaphrodite repulsion (PubMed:22665789, PubMed:23509272). May function upstream of the daf-11, daf-7 and daf-2 signaling pathways (PubMed:22665789). Homodimer. Heterodimer; with daf-38. Localizes to the cell membrane in the presence of daf-38, but localizes to the Golgi apparatus in the absence of daf-38. Expressed in the ASI and ASK chemosensory neurons, in the IL-2 interneurons, and in the male specific CEM (cephalic sensilla, male) neurons. Expressed strongly during the L1 and L2 stages of larval development, but expression is weaker during the subsequent L3 and L4 stages of larval development and during the adult stages of development. Belongs to the G-protein coupled receptor 1 family.