Enables calcitonin family receptor activity. Involved in several processes, including locomotory behavior; signal transduction; and sleep. Located in plasma membrane. Expressed in several structures, including I1 neuron; RMEV; ganglia; mechanosensory neurons; and vulD. Human ortholog(s) of this gene implicated in bone disease (multiple); hereditary lymphedema; and primary failure of tooth eruption. Is an ortholog of human CALCR (calcitonin receptor); CALCRL (calcitonin receptor like receptor); and PTH1R (parathyroid hormone 1 receptor).