Predicted to enable G protein-coupled receptor activity and calcium ion binding activity. Acts upstream of or within gamma-aminobutyric acid signaling pathway; nervous system development; and pronephric glomerulus development. Predicted to be located in plasma membrane. Is expressed in muscle; nervous system; notochord; and spinal cord neural tube. Orthologous to human CELSR3 (cadherin EGF LAG seven-pass G-type receptor 3).