from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A group of glands that secrete yolk around the egg in those invertebrates, such as worms, whose eggs do not contain yolk.
from The Century Dictionary and Cyclopedia
- n. A special gland of the female generative apparatus of some worms, additional to the germarium, in which gland an accessory vitelline substance is formed. See germarium, and cuts under Trematoda and Rhabdocœla.
Bpvasa and Bpnos RNA expression have very similar distributions in the Brachionus ovary, showing ubiquitous expression in the vitellarium, with higher levels in the putative germ cell cluster.
An experienced worker would recognize the bag-like organ (arrow) along the lower body wall as a vitellarium (the other vitellarium would be on the opposite side).