A receptor for the FMRFamide peptides (PubMed:12218185, PubMed:12438685). Reacts with high affinity to FMRFamide and intrinsic FMRFamide-related peptides (PubMed:12218185, PubMed:12438685). By stimulating intracellular calcium signaling through the inositol 1,4,5-trisphosphate receptor, Itpr, in dopaminergic neurons, may be involved in the maintenance of neuronal excitability and in the regulation of flight bout duration (PubMed:30110323). Expressed in ovaries, heads and bodies (PubMed:12438685). Expressed in dopaminergic neurons. Expressed throughout development; strongest in larvae and adults (PubMed:12218185). In larvae, expressed in trachea, brain, gut, fat body and Malpighian tubules (PubMed:30110323). Deficits in simulated flight behavior with fewer or shorter duration of wing beats in tethered flies (PubMed:30110323). Dopaminergic neuron-specific knockout leads to shorter flight duration (PubMed:30110323). RNAi-mediated knockdown, either in adults or during pupal development, results in similar deficits in simulated flight behavior, whereas knockdown during larval development has no effect on flight behavior in the adult (PubMed:30110323). Pan-neuronal or dopaminergic neuron-specific RNAi-mediated knockdown leads to significantly shorter flight bouts (PubMed:30110323). Belongs to the G-protein coupled receptor 1 family.