A mounting assembly for an ostomy appliance, comprising: (a) a body flange comprising: (i) a flexible plastic member located on a first side of the body flange, the flexible plastic member comprising a flange ring projecting axially from the body flange, a rim surrounding the flange ring, and first and second loops (22, 24) extending radially from the rim, each of the first and second loops (22, 24) comprising a raised fence around an opening that forms a pocket, and (ii) an adhesive skin barrier member located on an opposite second side of the body flange, and (b) an ostomy pouch comprising: (i) a proximal sheet having an aperture, (ii) a distal sheet sealed to the proximal sheet at their respective peripheries to form the ostomy pouch, and (iii) a pouch ring attached to the proximal sheet, surrounding the aperture of the proximal sheet, the pouch ring comprising an adhesive coating on the pouch ring and third and fourth loops (44, 46) extending radially from the pouch ring, wherein: the body flange and ostomy pouch are configured for the third and fourth loops (44, 46) to engage within the pocket of the first and second loops (22, 24), respectively, the pouch ring to fit around the flange ring, and the rim of the flexible plastic member to contact the adhesive coating on the pouch ring, for assembly of the ostomy appliance, characterized in that: the adhesive skin barrier member has a multi-petaled outer perimeter that has a shape corresponding to 2 to 8 petals extending radially from the adhesive skin barrier member, distributed uniformly around the adhesive skin barrier member, and separated by notches that expand radially from the adhesive skin barrier member, wherein each of the 2 to 8 petals intersects angularly with each petal adjacent thereto, thereby defining the notches, and the 2 to 8 petals each have a width that first increases, then decreases, radially outwardly from the adhesive skin barrier member. (a) a body flange comprising: (i) a flexible plastic member located on a first side of the body flange, the flexible plastic member comprising a flange ring projecting axially from the body flange, a rim surrounding the flange ring, and first and second loops (22, 24) extending radially from the rim, each of the first and second loops (22, 24) comprising a raised fence around an opening that forms a pocket, and (ii) an adhesive skin barrier member located on an opposite second side of the body flange, and (i) a flexible plastic member located on a first side of the body flange, the flexible plastic member comprising a flange ring projecting axially from the body flange, a rim surrounding the flange ring, and first and second loops (22, 24) extending radially from the rim, each of the first and second loops (22, 24) comprising a raised fence around an opening that forms a pocket, and (ii) an adhesive skin barrier member located on an opposite second side of the body flange, and (b) an ostomy pouch comprising: (i) a proximal sheet having an aperture, (ii) a distal sheet sealed to the proximal sheet at their respective peripheries to form the ostomy pouch, and (iii) a pouch ring attached to the proximal sheet, surrounding the aperture of the proximal sheet, the pouch ring comprising an adhesive coating on the pouch ring and third and fourth loops (44, 46) extending radially from the pouch ring, (i) a proximal sheet having an aperture, (ii) a distal sheet sealed to the proximal sheet at their respective peripheries to form the ostomy pouch, and (iii) a pouch ring attached to the proximal sheet, surrounding the aperture of the proximal sheet, the pouch ring comprising an adhesive coating on the pouch ring and third and fourth loops (44, 46) extending radially from the pouch ring, the body flange and ostomy pouch are configured for the third and fourth loops (44, 46) to engage within the pocket of the first and second loops (22, 24), respectively, the pouch ring to fit around the flange ring, and the rim of the flexible plastic member to contact the adhesive coating on the pouch ring, for assembly of the ostomy appliance, characterized in that: the adhesive skin barrier member has a multi-petaled outer perimeter that has a shape corresponding to 2 to 8 petals extending radially from the adhesive skin barrier member, distributed uniformly around the adhesive skin barrier member, and separated by notches that expand radially from the adhesive skin barrier member, wherein each of the 2 to 8 petals intersects angularly with each petal adjacent thereto, thereby defining the notches, and the 2 to 8 petals each have a width that first increases, then decreases, radially outwardly from the adhesive skin barrier member.