mouth hook (with stv1)
stv2/stv3 larvae derived from females containing stv- germline clones die during the first larval instar. stv2/stv3 larvae derived from females containing stv- germline clones show severely reduced or no detectable food uptake. stv1/stv3 larvae derived from females containing stv- germline clones show only a slight delay in development, however some of these larvae show a failure of the second instar and third instar mouth hooks to separate, preventing the completion of the second moult.