1-20 OF 29 RESULTS FOR

peramorphosis

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Image
The pattern of paedomorphosis and <b>peramorphosis</b> across the  Triplicitella  ...
Published: 01 May 2016
Figure 6 The pattern of paedomorphosis and peramorphosis across the Triplicitella + Spissatella + Eucrassatella clade. Lineages are shown as gray arrows, with ontogenetic trajectory plots for each pair of species along the lineage segment superimposed. The x-axis
Image
Table  1 —Heterochronic processes of paedomorphosis and <b>peramorphosis</b> (afte...
Published: 01 May 2003
Table 1 —Heterochronic processes of paedomorphosis and peramorphosis (after McNamara, 1986a)
Journal Article
Journal: Paleobiology
Published: 01 May 2016
Paleobiology (2016) 42 (2): 305-316.
...Figure 6 The pattern of paedomorphosis and peramorphosis across the Triplicitella + Spissatella + Eucrassatella clade. Lineages are shown as gray arrows, with ontogenetic trajectory plots for each pair of species along the lineage segment superimposed. The x-axis...
FIGURES | View All (7)
Journal Article
Published: 05 September 2002
Canadian Journal of Earth Sciences (2003) 40 (8): 1071-1083.
... is presented. This study shows that the palatoquadrate of higher aistopods is derived in-group, which is consistent with the trends in aistopods of peramorphosis in the endochondral skeleton and paedomorphosis in the dermal skeleton. © 2003 NRC Canada 2003 Corresponding author (e-mail: janderson...
FIGURES | View All (9)
Journal Article
Published: 01 July 2000
Journal of Paleontology (2000) 74 (4): 636-653.
... and the Geryonidae Colosi, 1923 , are closely related families ( Manning and Holthuis, 1989 ). The new fossils suggest that the Geryonidae may in fact be derived from a portunid progenitor, Proterocarcinus Feldmann, Casadío, Chirino-Gálvez, and Aguirre Urreta, 1995 , through a process of peramorphosis in which...
FIGURES | View All (10)
Series: Geological Society, London, Special Publications
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.177.01.27
EISBN: 9781862394254
.... Heterochrony was the dominant evolutionary mechanism and, following an initial peramorphic expansion into morphospace, both paedomorphosis and peramorphosis probably occurred in approximately equal proportions. In general, it is not possible to decouple patterns of shape and size evolution. The data reveal...
FIGURES | View All (14)
Journal Article
Journal: Paleobiology
Published: 01 January 2002
Paleobiology (2002) 28 (4): 551-558.
... peramorphosis. Merely by looking at the ontogenetic sequences that they illustrate (unfortunately only as drawings, not a photographs) it is apparent that global peramorphosis is a most unlikely explanation (as it often is). Their detailed geometric morphometric analysis shows very well the complex and subtle...
Journal Article
Journal: Paleobiology
Published: 01 January 2005
Paleobiology (2005) 31 (3): 354-372.
... of the ancestor at a more juvenile age (paedomorphosis) or at a more mature age (peramorphosis; this could be a hypothetical extrapolation beyond the terminal morphology of the ancestor), or retains ancestral shape but differs in size (dwarfism or gigantism). A nomenclature is in place describing the various ways...
FIGURES | View All (6)
Journal Article
Published: 01 May 2003
Journal of Paleontology (2003) 77 (3): 471-475.
...Table 1 —Heterochronic processes of paedomorphosis and peramorphosis (after McNamara, 1986a) ...
FIGURES
Journal Article
Journal: Paleobiology
Published: 01 January 2005
Paleobiology (2005) 31 (2_Suppl): 17-26.
.... Examples include acceleration of spinal cord development in frogs ( Schlosser 2003 ), early maturation of the stomata in plants ( Snir and Sachs 2002 ), and paedo- and peramorphosis in late Triassic rhyncosaur dentition ( Langer et al. 2000 ). The fact that heterochrony is rarely “global” (affecting...
Journal Article
Published: 21 September 2000
Canadian Journal of Earth Sciences (2000) 37 (10): 1377-1387.
... to late Santonian. The earliest genus, Reesidites Wright and Matsumoto, was presumably derived from Subprionocyclus Shimazu of late Collignoniceratinae through peramorphosis. Subprionocyclus is characterized by having two rows of ventrolateral tubercles; some species, however, lack lower...
FIGURES | View All (7)
Journal Article
Published: 01 July 2014
Journal of Paleontology (2014) 88 (4): 652-663.
... of volume increase and profound gyrencephaly in odontocetes transcends anything known in more plesiomorphic relatives and hence can be seen as peramorphosis. In the postcranial skeleton, both the neck and tail are elaborated in ways that transcend more plesiomorphic states, and the addition of the tail...
FIGURES | View All (8)
Journal Article
Journal: Paleobiology
Published: 01 January 2001
Paleobiology (2001) 27 (2): 262-289.
... Soritida constitutes a peramorphocline ( McKinney and McNamara 1991 ). The progressive earlier onset of the annular stage in the ontogeny indicates that peramorphosis may have been achieved through predisplacement ( McKinney and McNamara 1991 ; Reilly et al. 1997 ). In this case the peramorphocline...
FIGURES | View All (4)
Journal Article
Published: 01 September 2002
Journal of Paleontology (2002) 76 (5): 810-821.
... with morph α as the reference, then it is also true that heterochrony resulted in peramorphosis of morph α when morph β is the reference. Although many examples of heterochrony have been identified among extant organisms (see Gould, 1977 ; McKinney, 1988b ; McNamara, 1995b ), there have been very few...
FIGURES | View All (11)
Journal Article
Published: 01 March 2003
Journal of Paleontology (2003) 77 (2): 401-405.
... in only three factors: the offset signal, the onset signal, and the rate of development, all of which are ways of altering the relative timing of somatic reproductive development. These three types of variation, coupled with the two alternative modes of heterochronic change—peramorphosis: somatic...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP423.5
EISBN: 9781862399556
... ). Consequently, meraspid cephala of Eskoharpes palanasus (Zone 13b) resemble the holaspids of the older species, E. wandjina and E. boltoni (Zone 12). This greater ontogenetic morphological change in the derived species indicates evolution by peramorphosis. Phylogenetically younger species in this clade...
FIGURES | View All (7)
Journal Article
Journal: Paleobiology
Published: 01 January 2001
Paleobiology (2001) 27 (2): 205-225.
... ; Jones and Gould 1999 ). Alberch et al. (1979) identified two general patterns of heterochrony: paedomorphosis, in which adult descendants resemble juvenile ancestors, and peramorphosis, where juvenile descendants at some point in their ontogeny resemble adult ancestors. Paedomorphic patterns can arise...
FIGURES | View All (7)
Journal Article
Journal: Paleobiology
Published: 01 January 2003
Paleobiology (2003) 29 (3): 369-380.
... and/or ϕ will give rise to peramorphosis and an increase in either variable will tend to produce paedomorphosis, all other things being equal. Multivincular and related patterns are found characteristically in the region of the morphospace in which ϕ is low and ϕ < λ ( Figs. 4 , 5 ), where...
FIGURES | View All (7)
Journal Article
Published: 01 March 2007
Journal of Paleontology (2007) 81 (2): 261-285.
... and consequently in generating evolutionary trends (e.g., McNamara, 1990 ). Studies in the heterochrony of early Paleozoic rhynchonelliform brachiopods are still very scarce, though promising. A striking case, well supported by ontogenetic data and the stratigraphic record, is the origination by peramorphosis...
FIGURES | View All (10)
Series: Geological Society, London, Special Publications
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.177.01.01
EISBN: 9781862394254
.... An overall strong correspondence between individual species ontogenies and evolutionary changes in adult form strongly suggest that heterochrony has been the dominant evolutionary mechanism throughout the lifespan of Spissatella. There is good evidence to suggest that paedomorphosis and peramorphosis...