from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A form of anisogamy (heterogamy) in which the female gamete (e.g. egg cell) is significantly larger than the male gamete (sperm) and is non-motile.
Sorry, no etymologies found.
From isogamy where both “egg” and “sperm” are one and the same, to anisogamy where the egg hecomes the larger and the sperm the smaller one to oogamy where the sperm is now flagellated and fertilizes an egg with no flagella.
Many species exhibit oogamy, a type of anosogamy in which a flagellated sperm fertilizes a nonmotile egg.