By Brian K. Hall
Some time past, fish fins developed into the limbs of land vertebrates and tetrapods. in this transition, a few parts of the fin have been carried over whereas new gains built. Lizard limbs, poultry wings, and human legs and arms are hence all evolutionary ameliorations of the unique tetrapod limb.
A finished examine the present nation of study on fin and limb evolution and improvement, this quantity addresses quite a lot of subjects—including progress, constitution, upkeep, functionality, and regeneration. Divided into sections on evolution, improvement, and differences, the e-book starts off with a ancient creation to the examine of fins and limbs and is going directly to give some thought to the evolution of limbs into wings in addition to variations linked to really good modes of existence, resembling digging and burrowing. Fins into Limbs additionally discusses events whilst evolution looks to were reversed—in whales, for instance, whose entrance limbs turned flippers once they reverted to the water—as good as events during which limbs are misplaced, corresponding to in snakes.
With contributions from world-renowned researchers, Fins into Limbs may be a font for additional investigations within the altering box of evolutionary developmental biology.
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Extra info for Fins into Limbs: Evolution, Development, and Transformation
16d, 17b, h, 18a). (D) Pelvic girdle in left lateral view (reversed from Coates 1996, fig. 20c). (E) Reconstruction of left pectoral limb in extensor view (reversed from Coates 1996, fig. 24b). (F) Right pectoral limb and right half of pelvis in dorsal view (after Coates 1996, fig. 23c). (G) Right clavicle of Ventastega in ventral view (after Ahlberg et al. 1994, fig. 12a). (H) Interclavicle in ventral view (after Ahlberg et al. 1994, fig. 12c). (I) Left ilium in lateral view (after Ahlberg et al.
Rhizodontid pectorals show a quite separate radiation in ﬁn form to that which occurred at the advent of digits. It seems unlikely that any rhizodont ﬁn provides much evidence of conditions at the base of the tetrapod stem. Fishlike tetrapod conditions between rhizodontids and Panderichthys, if represented adequately by Sterropterygion and Eusthenopteron, are marked by further anatomical conservatism. From Panderichthys onward, something like a recognizable tetrapod humerus is present: dorsoventrally ﬂattened with an easily identiﬁed entepicondyle and ectepicondyle.
Rackoff 1980; Rosen et al. 1981, and references therein). Fin rays in osteolepiforms consist of conventional lepidotrichia (ﬁg. 7D), segmented at even intervals throughout their length. Andrews and Westoll (1970a) note some elongation of proximal segments at the level of ﬁn ray insertion, where they overlap postaxial processes and the spatulate ends of endoskeletal radials. berg et al. 2000). Panderichthys is the only member known from complete specimens (Vorobyeva 1992). The dermal pectoral girdle includes the full complement of bones described in osteolepiforms.
Fins into Limbs: Evolution, Development, and Transformation by Brian K. Hall