Progenesis is a mechanism in developmental biology that is associated with paedomorphosis. Progenesis refers to the attainment of sexual maturity by an organism still in its larval or juvenile stage and a secondary result of never experiencing later developmental stages. Organisms that are progenetic never achieve the adult form experienced by their evolutionary ancestors. Developmental biology is the study of the process by which organisms grow and develop. ... Paedomorphosis is a biological term describing the retention of ancestral infantile or juvenile traits in an adult organism. ... Human sexuality is the expression of sexual feelings. ... In biology and ecology, an organism (in Greek organon = instrument) is a complex adaptive system of organs that influence each other in such a way that they function as a more or less stable whole and have properties of life. ... A larva (Latin; plural larvae) is a juvenile form of animal with indirect development, undergoing metamorphosis (for example, insects or amphibians). ...

Mechanisms of Progenesis

Progenesis is sometimes induced by environmental conditions that inhibit the completion of metamorphosis, such as low temperature or lack of available iodine leading to low thyroid gland activity. The larval form may mature sexually, mate, and produce fully viable offspring. If environmental conditions improve, this particular kind of progenesis can sometimes be reversed, with the larvae completing metamorphosis and attaining normal maturity. Metamorphosis in a process in biology by which individual physically develops after birth or hatching involving significant change in form as well as growth and differentiation. ... Media:Example. ... The thyroid gland and its relations In anatomy, the thyroid (IPA θaɪɹoɪd) is an endocrine gland. ...

Animal Kingdom

This biological state is found predominantly among certain amphibians and insects. For other uses, see Amphibian (disambiguation). ... Orders Subclass Apterygota Symphypleona - globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura - extinct Thysanura (common bristletails) Subclass Pterygota Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Ephemeroptera (mayflies) Odonata (dragonflies and damselflies) Infraclass Neoptera Blattodea (cockroaches) Mantodea (mantids) Isoptera (termites) Zoraptera Grylloblattodea Dermaptera (earwigs) Plecoptera (stoneflies) Orthoptera (grasshoppers, crickets...

Paedogenesis

Progenetic organisms are capable of paedogenesis. This is the act of reproducing while in the larval form and occurs in the females of certain beetles, Strepsiptera, bagworms, and gall midges. Paedogenesis is the act of reproduction by an organism that has not achieved physical maturity. ... Suborders Adephaga Archostemata Myxophaga Polyphaga See subgroups of the order Coleoptera Beetles are one of the main groups of insects. ... Families Mengenillidae Mengeidae Stylopidae Bohartillidae Corioxenidae Halictophagidae Callipharixenidae Elenchidae Myrmecolacidae Species in the nine families of this small (~600 species) order of insects are parasites in other insects; their hosts include bees, wasps, leafhoppers, silverfish, and cockroaches. ... Binomial name Thyridopteryx ephemeraeformis (Haworth, 1803) The Bagworm (Thyridopteryx ephemeraeformis) is a moth that spins its cocoon all its larval life, decorating it with bits of juniper, thuja, cypress, pine, spruce, cedar, and other such conifers, on which it also feeds. ...

See also

• paedomorphosis
• neoteny
• paedogenesis
• heterochrony