Although the word chondroblast is commonly used to describe an immature chondrocyte, the term is imprecise, since the progenitor of chondrocytes (which are mesenchymal stem cells) can differentiate into various cell types, including osteoblasts
choanocyte. n. 1. (Zoology) any of the flagellated cells in sponges that maintain a flow of water through the body. A collar of protoplasm surrounds the base of the flagellum. Also called: collar cell.
Choanoflagellates are a variety of nanoplankton, referring to the smallest (single-celled) form of organisms in the sea. As such, they are consumed by a variety of larger organisms, including krill and many others.