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In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus, and the female gametophyte in its center. The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell for the purpose of fertilization.
The chalaza is a structure inside bird and reptile eggs and plant ovules. It attaches or suspends the yolk or nucellus within the larger structure.
Ovomucin is a glycoprotein found mainly in egg whites, as well as in the chalaza and vitelline membrane. The protein makes up around 2-4% of the protein content of egg whites; like other members of the mucin protein family, ovomucin confers gel-like properties. It is composed of two subunits, alpha-ovomucin (MUC5B) and beta-ovomucin (MUC6), of which the beta subunit is much more heavily glycosylated.
The Laelapidae are a family of mites in the order Mesostigmata. The family is also referred to in the literature as Laelaptidae, which may be the correct spelling.
Dermanyssoidea is a superfamily of mites, including most of the mites which parasitise vertebrates. It contains 21 families:
Alphalaelaps is a genus of mites in the family Laelapidae.
Blaberolaelaps is a genus of mites in the family Laelapidae.
Cerambylaelaps is a genus of mites in the family Laelapidae.
Chelanyssus is a genus of mites in the family Laelapidae.
Chrysochlorolaelaps is a genus of mites in the family Laelapidae.
Conolaelaps is a genus of mites in the family Laelapidae.
Eubrachylaelaps is a genus of mites in the family Laelapidae.
Gopriphis is a genus of mites in the family Laelapidae.
Jacobsonia is a genus of mites in the family Laelapidae.
Laelaspoides is a genus of mites in the family Laelapidae.
Myrmozercon is a genus of mites in the family Laelapidae.
Phytojacobsonia is a genus of mites in the family Laelapidae.
Pneumolaelaps is a genus of mites in the family Laelapidae.
Rhinolaelaps is a genus of mites in the family Laelapidae.
Ugandolaelaps is a genus of mites in the family Laelapidae.
References
- ↑ David Evans Walter (ed.). "Laelapidae Species Listing". Biology Catalog. Texas A&M University . Retrieved August 31, 2010.