The many faces of synapsid cranial allometry
The many faces of synapsid cranial allometry
复制标题
合弓动物颅骨异速生长的多面性
DOI:
10.1017/pab.2019.26
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发表时间:
2019
期刊:
影响因子:
2.7
通讯作者:
Angielczyk
中科院分区:
文献类型:
--
作者:
Kammerer;Angielczyk
Previous studies of cranial shape have established a consistent interspecific allometric pattern relating the relative lengths of the face and braincase regions of the skull within multiple families of mammals. In this interspecific allometry, the facial region of the skull is proportionally longer than the braincase in larger species. The regularity and broad taxonomic occurrence of this allometric pattern suggests that it may have an origin near the base of crown Mammalia, or even deeper in the synapsid or amniote forerunners of mammals. To investigate the possible origins of this allometric pattern, we used geometric morphometric techniques to analyze cranial shape in 194 species of nonmammalian synapsids, which constitute a set of successive outgroups to Mammalia. We recovered a much greater diversity of allometric patterns within nonmammalian synapsids than has been observed in mammals, including several instances similar to the mammalian pattern. However, we found no evidence of the mammalian pattern within Therocephalia and nonmammalian Cynodontia, the synapsids most closely related to mammals. This suggests that the mammalian allometric pattern arose somewhere within Mammaliaformes, rather than within nonmammalian synapsids. Further investigation using an ontogenetic series of the anomodont Diictodon feliceps shows that the pattern of interspecific allometry within anomodonts parallels the ontogenetic trajectory of Diictodon. This indicates that in at least some synapsids, allometric patterns associated with ontogeny may provide a “path of least resistance” for interspecific variation, a mechanism that we suggest produces the interspecific allometric pattern observed in mammals.
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影响因子:
2.5
作者:
M. Zelditch;Zachary T. Calamari;D. L. Swiderski
通讯作者:
D. L. Swiderski
影响因子:
3.7
作者:
Brocklehurst N;Reisz RR;Fernandez V;Fröbisch J
通讯作者:
Fröbisch J
影响因子:
2.9
作者:
Goswami, Anjali
通讯作者:
Goswami, Anjali
DOI:
--
发表时间:
2001
期刊:
Evolution; international journal of organic evolution
影响因子:
--
作者:
C. Sidor
通讯作者:
C. Sidor
影响因子:
1.8
作者:
Benoit, Julien;Abdala, Fernando;Rubidge, Bruce S.
通讯作者:
Rubidge, Bruce S.