Protracted juvenilism (heterochrony, paedomorphosis
, or neoteny of various authors) is a feature of angiosperm woods almost exclusively.
in Ambystoma talpoideum: effects of density, food, and pond drying.
Tall non-storied rays composed chiefly or entirely of upright cells are indicative of paedomorphosis
in wood of the genus.
Many populations of the western tiger salamander, Ambystoma mavortium, express facultative paedomorphosis
. Because all ponds freeze, this means that these larval salamanders (and possibly transformed salamander as well) must overwinter under the ice.
Moreover, some changes are consistent with an evolutionary quirk known as paedomorphosis
, in which species retain in adulthood the youthful dimensions that their ancestors had as juveniles.
, with special reference to Leopardus.
Phylogeny and paedomorphosis
in an African family of freshwater fishes (Gonorynchiformes: Kneriidae).
(2005) viewed the occurrence of paedomorphosis
as evidence against recapitulation.
(juvenile features retained in adults) is a mechanism of evolutionary change sometimes seen as simplification of the body, a feature common in mesopelagic animals (Herring, 2002) and may be the case with C.
1987), wing morphology polymorphisms in insects (Harrison 1980; Roff 1986), seasonal wing color polymorphisms in lepidopterans (Watt 1969; Kingsolver 1995) and facultative paedomorphosis
in salamanders (Sprules 1974a; Semlitsch 1987; Whiteman 1994b).
This feature is present in species with protracted juvenilism (also termed paedomorphosis
, which implies sexual reproduction while in a juvenile state of development).
Approximately 10% of all species of salamander exhibit paedomorphosis
, i.e., a life cycle where the larval salamander does not metamorphose (Lanoo, 2005).