part of ventral surface outer chorion frill Fig 28,31,32 Abbr: Fr in ISBN:0-937548-00-6. In many anopheline eggs and eggs of the genera Hodgesia and Mimomyia, a narrow, usually ribbed, ridgelike formation of the outer chorion located on or near the ventral surface and commonly enclosing an area termed the "deck". In anopheline eggs, the frill may 1) completely or incompletely enclose an undivided deck, 2) in essence be two frills, one surrounding the anterior part and the other the posterior part of a divided deck, or 3) have the form of a collar around the anterior or posterior end of the egg. TGMA:0000684 TGMA:0000684 abas air-pocket anterior collar attached edge of membrane clasping membrane collar default_namespace dorsal frill dorsal process extra-chorial rim frilled cuticle fringe fringelike structure posterior collar rim