We can even refer the rays of Gnetum gnemon to the Heterogeneous Type I of Kribs (1935), whereas the rays of Welwitschia secondary xylem (Carlquist and Gowans 1995) correspond to Paedomorphic
Type I of Carlquist (1988).
The presence of the byssus in the adult represents the persistence of a postlarval organ, i.e., that the animals possessing it are in this respect neotenous or paedomorphic
facial expressions give dogs a selective advantage.
A new species of subterranean blind salamander from Austin, Texas, and a systematic revision of central Texas paedomorphic
Additionally, in Lake 21, six individuals were identified as cannibalistic morph paedomorphic
adult by their large size (> 120 mm), presence of enlarged cloaca's, and sexual maturity stage identified from dissections following criteria described in Collins (1981), i.e., level III and level IV were considered reproductively mature.
(2011) described a paedomorphic
condition in Porpoises based on some skeletal characters such as short rostrum and scarce closure of cranial sutures.
features and allometric growth in the skull of Elephas falconeri from Spinagallo (Middle Pleistocene, Sicily).
Analyses of ontogeny restricted to a single species are not enough to explain the direction of evolutionary change in certain structures within taxonomic groups; these analyses also cannot define the growth of a structure as paedomorphic
or peramorphic, leaving the realm of heterochrony.
pectoral fin 13/13 13/13 pelvic fin i5/5i i5/5i caudal fin 6/5 8,8/6,10 branchiostegal 1.3.1/1.3.1 rays gill rakers 0+8/8+0 epurals 2 vertebrae 10+16=26 11+15=26 While alizarin generally stains bones red, and methylene blue stains cartilage blue, this distinction is not always clear-cut in fishes, especially in larvae and paedomorphic
or very small species.
While evolutionary theory typically considers the paedomorphic
status as fixed once attained (e.g., Gould, 1977), more recent observations indicate that paedomorphic
salamanders are still capable of metamorphosis (Winne and Ryan, 2001).
is apparently a paedomorphic
species: its peculiar morphology is a result of heterochronic changes in its ontogeny.