Anthocorids possess two pairs of wings with sclerotized forewings and membranous hindwings. They have two pairs of membranous wings that may be hyaline, cloudy, or pigmented. They are simple, membranous, orbicular to elliptic and acuminate. The scales are obovate, lobed, and fringed, membranous, hairy or smooth, and usually caducous. It has six petals which are smaller than sepals, obovate, and membranous. The adult fold is approximately three-fifths membranous and two-fifths cartilaginous. The forewings of an earwig are sclerotized to serve as protection for the membranous hindwings. The vertical seed is ellipsoid, with yellowish brown, membranous, hairy seed coat. Thus frontal and parietal bones are purely membranous. A definitive diagnosis of membranous nephropathy requires a kidney biopsy. These are basal, emerging from the bulb initially-enclosed in a tubular membranous sheath of cataphylls. Ossification starts as membranous ossification before birth. The larger part of the scapula undergoes membranous ossification. It results in delayed ossification of midline structures of the body, particularly membranous bone. The membranous viscerocranium includes the mandible.