Oviparity
Oviparous animals are animals that lay eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, reptiles, all birds, and the monotremes.
In traditional usage, most insects, molluscs, and arachnids are also described as oviparous; Thierry Lodé (2012), however, describes the mode of reproduction in these organisms as "ovuliparous".
Modes of reproduction
The traditional modes of reproduction include oviparity, taken to be the ancestral condition, traditionally where either unfertilised oocytes or fertilised eggs are spawned, and viviparity traditionally including any mechanism where young are born live, or where the development of the young is supported by either parent in or on any part of their body.
The biologist Thierry Lodé divided the traditional oviparous mode of reproduction based on the relationship between the zygote (fertilised egg) and the parents into two modes, one of them named (true) oviparity:
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