Morphogenesis of the Shoulder Architecture. Part III. Amphibia

Howell, Amanda

doi:10.1086/394492

Cited by 23 publications

(29 citation statements)

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“…). Both Chen's and our ontogenetic studies of salamanders thus contradict the idea, defended by authors such as Howell () and mainly based on comparisons of adult morphology, that the procoracohumeralis is a dorsal pectoral muscle. Interestingly, in the present study the coracobrachialis seems to develop from the anlage of, or from an anlage that lies very near the anlage of, the pectoralis (Fig.…”

Section: Discussioncontrasting

confidence: 63%

Development of fore‐ and hindlimb muscles in GFP‐transgenic axolotls: Morphogenesis, the tetrapod bauplan, and new insights on the Forelimb‐Hindlimb Enigma

Diogo

Tanaka

2013

J Exp Zool Pt B

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The axolotl is becoming one of the most used model organisms in developmental and regenerative studies but no publication has described in detail the development of its forelimb and hindlimb muscles. We describe and illustrate the ontogeny of these muscles in transgenic axolotls that express GFP in muscle fibers and discuss our results and data previously obtained by us and by other authors about limb regeneration in axolotls and ontogeny in frogs and other tetrapods. Our observations and comparisons: (1) demonstrate radio-ulnar and ventro-dorsal morphogenetic gradients in the order of axolotl forelimb muscle formation and differentiation, while in axolotl hindlimb ontogeny there are only proximo-distal and tibio-fibular gradients; some of the axolotl gradients are therefore different from the ulno-radial/fibulo-tibial fore- and hindlimb and the dorso-ventral hindimb ontogenetic morphogenetic gradients seen in frogs and amniotes such as chickens; (2) provide a potential explanation for the usual presence, in both limbs of taxa from all major tetrapod groups, of more radial/tibial muscles than ulnar/fibular muscles; (3) support the "in-out" developmental mechanism of appendicular muscle formation; (4) offer new insights about the ancestral Bauplan of tetrapod limbs, including the striking similarity of the zeugopodial (forearm/leg) and autopodial (hand/foot) muscles of the two limbs and the ventro-dorsal symmetry of the zeugopodial muscles of a same limb; and (5) provide further evidence to corroborate the hypothesis that these similarities are due to derived homoplastic events that occurred during the fins-limbs transition and not due to forelimb-hindlimb serial homology.

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Section: Discussioncontrasting

confidence: 63%

Development of fore‐ and hindlimb muscles in GFP‐transgenic axolotls: Morphogenesis, the tetrapod bauplan, and new insights on the Forelimb‐Hindlimb Enigma

Diogo

Tanaka

2013

J Exp Zool Pt B

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“…Examples of researchers that have used salamanders to study the ancestral Bauplan of tetrapods include Humphry (1872a,b), Gregory (1929), Howell (1935Howell ( , 1936aHowell ( ,b, 1937a, Straus (1941a,b) and Goodrich (1930), and, more recently, Clack (2002), Shubin (2008) and Kawano et al (2013). Examples of researchers that have used salamanders to study the ancestral Bauplan of tetrapods include Humphry (1872a,b), Gregory (1929), Howell (1935Howell ( , 1936aHowell ( ,b, 1937a, Straus (1941a,b) and Goodrich (1930), and, more recently, Clack (2002), Shubin (2008) and Kawano et al (2013).…”

Section: Comparative Anatomy Phylogeny Muscles and Anatomicallymentioning

confidence: 99%

Is evolutionary biology becoming too politically correct? A reflection onthe scala naturae, phylogenetically basal clades, anatomically plesiomorphic taxa, and ‘lower’ animals

2014

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The notion of scala naturae dates back to thinkers such as Aristotle, who placed plants below animals and ranked the latter along a graded scale of complexity from 'lower' to 'higher' animals, such as humans. In the last decades, evolutionary biologists have tended to move from one extreme (i.e. the idea of scala naturae or the existence of a general evolutionary trend in complexity from 'lower' to "higher" taxa, with Homo sapiens as the end stage) to the other, opposite, extreme (i.e. to avoid using terms such as 'phylogenetically basal' and 'anatomically plesiomorphic' taxa, which are seen as the undesired vestige of old teleological theories). The latter view tries to avoid any possible connotations with the original anthropocentric idea of a scala naturae crowned by man and, in that sense, it can be regarded as a more politically correct view. In the past years and months there has been renewed interest in these topics, which have been discussed in various papers and monographs that tend to subscribe, in general, to the points defended in the more politically correct view. Importantly, most evolutionary and phylogenetic studies of tetrapods and other vertebrates, and therefore most discussions on the scala naturae and related issues have been based on hard tissue and, more recently, on molecular data. Here we provide the first discussion of these topics based on a comparative myological study of all the major vertebrate clades and of myological cladistic and Bayesian phylogenetic analyses of bony fish and tetrapods, including Primates. We specifically (i) contradict the notions of a scala naturae or evolutionary progressive trends leading to more complexity in 'higher' animals and culminating in Homo sapiens, and (ii) stress that the refutation of these old notions does not necessarily mean that one should not keep using the terms 'phylogenetically basal' and particularly 'anatomically plesiomorphic' to refer to groups such as the urodeles within the Tetrapoda, or the strepsirrhines and lemurs within the Primates, for instance. This review will contribute to improving our understanding of these broad evolutionary issues and of the evolution of the vertebrate Bauplans, and hopefully will stimulate future phylogenetic, evolutionary and developmental studies of these clades.

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“…Comparisons with Early Tetrapods.-Several authors (Romer 1922(Romer , 1924Howell 1933Howell , 1935Gregory and Raven 1941;Marinelli 1946;Westoll 1943a;Jarvik 1955a) have commented on the differences between the shoulder girdles of fish and tetrapods. In tetrapods, only the cleithrum, clavicle and interclavicle have been retained from the dermal girdle, and their homologies with these bones in Eusthenopteron are clear.…”

Section: Dermal Shoulder Girdlementioning

confidence: 99%

IX.—The Postcranial Skeleton ofEnsthenopteron foordiWhiteaves

Andrews¹,

Westoll

1970

Trans. R. Soc. Edinb.

165

251

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SYNOPSIS WELL preserved material of the crossopterygian fish Eusthenopteron enables fresh reconstructions and interpretations of its postcranial skeleton to be given. Comparisons throughout with other bony fishes show that it may •« primitive in many features. Similarities with early amphibians such as the screw-shaped glenoid, the form of the humerus (on which an attempt to restore the pectoral musculature is based), the dorsal bicipital ribs and the possibility of a sacral attachment, throw much light on the origin of the tetrapod postcranial skeleton, particularly of the cheiropterygium. A functional analysis of the skeleton of Ensthenopteron is attempted, suggesting that it resembled the pike (Esox) in its mode of life and that it may have been capable of short journeys "walking" overland. The possible selective factors stimulating the evolution of such a fish, and further evolution to the tetrapod stage are discussed.

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Morphogenesis of the Shoulder Architecture. Part III. Amphibia

Cited by 23 publications

References 0 publications

Development of fore‐ and hindlimb muscles in GFP‐transgenic axolotls: Morphogenesis, the tetrapod bauplan, and new insights on the Forelimb‐Hindlimb Enigma

Development of fore‐ and hindlimb muscles in GFP‐transgenic axolotls: Morphogenesis, the tetrapod bauplan, and new insights on the Forelimb‐Hindlimb Enigma

Is evolutionary biology becoming too politically correct? A reflection onthe scala naturae, phylogenetically basal clades, anatomically plesiomorphic taxa, and ‘lower’ animals

IX.—The Postcranial Skeleton ofEnsthenopteron foordiWhiteaves

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