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peramorphocline

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Figure  4 —Representative ontogenetic stages of the taxa described herein, ...
Published: 01 March 2007
Figure 4 —Representative ontogenetic stages of the taxa described herein, dorsal valve only. Vertically aligned illustrations correspond to approximately equivalent morphologies in ancestral and descendant species. Increasingly peramorphic species through time define a peramorphocline (from bottom
Journal Article
Journal: Paleobiology
Published: 01 August 2011
Paleobiology (2011) 37 (3): 369–382.
... levels. Another measure of allometric disparity suggests the occurrence of two heterochronic trends, a peramorphocline followed by a paedomorphocline, during the Toarcian. These trends are concomitant with changes in average adult size that compensate for the heterochronic effects and explain...
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F igure  7. Curve of allometric disparity during the Pliensbachian–Toarcian...
Published: 01 August 2011
the Pliensbachian, the average distance to isometry increases during the first part of the Toarcian (Tenuicostatum–Variabilis) and then declines (Variabilis–Aalensis). This suggests the succession of two heterochronoclines: a peramorphocline followed by a paedomorphocline. The size pattern tends to display
Image
F igure  3. Polarity of evolutionary developmental changes between ancestor...
Published: 01 August 2011
(paedo- or peramorphocline).
Journal Article
Journal: Paleobiology
Published: 01 January 2001
Paleobiology (2001) 27 (2): 262–289.
... and the corresponding earlier onset of the terminal annular stage in megalospheric tests observed in the crown 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...
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Journal Article
Published: 01 March 2007
Journal of Paleontology (2007) 81 (2): 261–285.
...Figure 4 —Representative ontogenetic stages of the taxa described herein, dorsal valve only. Vertically aligned illustrations correspond to approximately equivalent morphologies in ancestral and descendant species. Increasingly peramorphic species through time define a peramorphocline (from bottom...
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Journal Article
Journal: Paleobiology
Published: 01 May 2021
Paleobiology (2021) 47 (2): 363–384.
... with environmental gradients—termed peramorphoclines and paedomorphoclines (McNamara 1982 ), or more generally heteroclines (McKinney 1999 ), although these terms conflate process (heterochrony) and evolutionary outcome (directional bias or macroevolutionary ratcheting)—have been recognized in the fossil record...
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Journal Article
Published: 01 November 2006
Journal of Paleontology (2006) 80 (6): 1072–1086.
... Peltocystidae ( Peltocystis ) and Kirkocystidae. This result is consistent with the conclusions of Lee et al. (2004) , who identified a peramorphocline characterized by the progressive acquisition of more elongate adorals extending to the lower thecal surface in their morphometric analysis of Ordovician...
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Series: SEPM Special Publication
Published: 01 January 2007
DOI: 10.2110/pec.07.88.0027
EISBN: 9781565762909
... between enlargement of the anterior cranium (peramorphocline) and reduction of the posterior jaw (paedomorphocline). The overall result is an anteriorization trend. FIG. 2. A holistic view of three major groups of placental mammals (after Schad, 1997; Lockley, 1999a , fig. 1.6). The rodents...
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