Neoteny
Videos
Neoteny, also called juvenilization, is the delaying or slowing of the physiological or somatic development of an organism, typically an animal. Neoteny in modern humans is more significant than in ot
Neoteny and reduction in skull size – grey wolf and chihuahua skulls
The axolotl (Ambystoma mexicanum) is a neotenous salamander, often retaining gills throughout its life.
Trilobite beetles (Platerodrilus ngi pictured) are a genus of beetles with larviform females; other Elateroid beetles may also have these
Heterochrony
Videos
In evolutionary developmental biology, heterochrony is any genetically controlled difference in the timing, rate, or duration of a developmental process in an organism compared to its ancestors or oth
Neoteny
…progenesis result in paedomorphism (as having the form typical of children) or paedomorphosis (changing towards forms typical of children), a type of heterochrony. It is the retention in adults of traits previously seen only in the young. Such retention is important in evolutionary biology, domestication, and…
Giraffes acquired their long necks through heterochrony, extending the development period of the seven neck vertebrae's growth in the embryo to add length to the bones, not by adding more bones.
Axolotls retain gills and fins as adults; these are juvenile features in most amphibians.
Irish elk skeleton with antlers spanning 2.7 metres (8.9 ft) and a mass of 40 kg (88 lb)