Mosquito Taxonomic Inventory

Images:

Abbreviation:

Fr

Definition:

In many anopheline eggs and eggs of genera Hodgesia and Mimomyia, a narrow, usually ribbed, ridge-like 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. In Hodgesia eggs, a short frill encloses a narrow deck on the ventral surface at the posterior end. In Mimomyia eggs, the frill completely encloses an undivided deck.

Synonyms:

For anopheline eggs: anterior collar, attached edge of membrane, air-pocket (in part), clasping membrane (in part), collar, dorsal frill, dorsal process (in part), extra-chorial rim, frilled cuticle, fringe, fringelike structure, posterior collar, rim; for Mimomyia eggs: peripheral frill.