Direct development
Direct development is a concept in biology. It refers to forms of growth to adulthood that do not involve metamorphosis. An animal undergoes direct development if the immature organism resembles a small adult rather than having a distinct larval form.[1] A frog that hatches out of its egg as a small frog undergoes direct development. A frog that hatches out of its egg as a tadpole does not.
Direct development is the opposite of
cocoon, between its larval and adult stages.[2]
Examples
- Most frogs in the genus Callulina hatch out of their eggs as froglets.
- ametabolous insects, undergo direct development.[3]
References
- S2CID 236202923. Retrieved March 7, 2023.
- PMID 31438816.
- ^ Scott F. Gilbert (2000). "Metamorphosis: The Hormonal Reactivation of Development". Developmental Biology (6 ed.). Sunderland, MA: Sinauer Associates. Retrieved March 19, 2023.