Contributions to the anatomy of fishes. II. The air-bladder and Weberian ossicles in the siluroid fishes

Bridge, T. W.; Haddon, A. C.

doi:10.5962/bhl.title.122981

Cited by 37 publications

(58 citation statements)

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“…The rheotactic hypothesis identifies a plausible potential disadvantage of lungs associated with montane aquatic habitats. It is strongly supported by the association of lunglessness or reduced lungs with such habitats in a variety of amphibian lineages and by parallel patterns in the reduction or loss of swim bladders in fishes (Bridge & Haddon, 1893). Limited experimental evidence also demonstrates that lung size affects the ability of amphibians to resist a current (Wilder & Dunn, 1920;Bruce et al 1994).…”

Section: Evolution Of Lurglessnessmentioning

confidence: 94%

Comparative morphology and evolution of the lungless caecilian Atretochoana eiselti (Taylor) (Amphibia: Gymnophiona: Typhlonectidae)

Wilkinson

Nussbaum

1997

Biological Journal of the Linnean Society

103

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Atretochoana iselti is a radically divergent aquatic caecilian until recently known from only a single specimen from South America. In addition to its status as the largest lungless tetrapod known, and the only known lungless caecilian, this species has a suite of highly unusual morphological features that sets it apart from all other tetrapods, including sealed choanae (internal nostrils), complete loss of pulmonary arteries and veins, novel cranial architecture, and a novel stapedial muscle. The external, buccal, skeletal, muscular and cardiovascular anatomies of Atretochoana eiselti are described and compared to these features in other caecilians, particularly representatives of all typhlonectid genera which are its closest relatives. The comparative morphological data are used as a basis for interpretations of the ecology and evolution of Atretochoana &elti. It is argued that lunglessness and the transition to cutaneous gas cxchange is correlated with life in cold, montane, fast-flowing streams. Here, high oxygn concentrations and reduced metabolic rate serve to relax the physiological limitations on body size imposed by a reliance upon cutaneous gas-exchange, and lungs can produce disadvantageous buoyancy. Cranial evolution has increased the gape of Atretochoana eiselti relative to other caecilians, and seems likely to be associated with a shift in prey size and possibly type. Several modifications of the cranium appear to be associated with enhanced cranial kinesis in which a distinct cheek unit is highly mobile. The novel stapedial musculature is interpreted as contributing to this cranial kinesis. Respiratory and cranial evolution are argued to be correlated, with the ventilatory function of the buccopharyngeal pump constraining the evolution of the skull. The evolution of lunglessness removed this constraint facilitating repatterning of the skull. 0 I997 'The Linnean Soriety or Iandon

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Section: Evolution Of Lurglessnessmentioning

confidence: 94%

Comparative morphology and evolution of the lungless caecilian Atretochoana eiselti (Taylor) (Amphibia: Gymnophiona: Typhlonectidae)

Wilkinson

Nussbaum

1997

Biological Journal of the Linnean Society

103

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“…Images were processed using Adobe Photoshop 6.0.2 and Adobe Illustrator CS. Weberian apparatus terminology follows Bridge and Haddon (1893) and Chranilov (1927) except that the term os suspensorium is used in its original sense as defined by Sørensen (1890). Skeletal descriptions include both sexes, unless otherwise stated.…”

Section: Methodsmentioning

confidence: 99%

Osteology of Paedocypris, a miniature and highly developmentally truncated fish (Teleostei: Ostariophysi: Cyprinidae)

Britz

Conway

2008

Journal of Morphology

161

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Species of the cyprinid genus Paedocypris are among the smallest and most developmentally truncated fishes and vertebrates. Our analysis of their skeletal structure reveals a puzzling combination of extreme developmental truncation and an increased morphological complexity in sexually dimorphic characters. The skeleton of Paedocypris is characterized by reduction and loss and resembles in many aspects that of a larval/early juvenile stage of its close relatives. We found 61 characters that have been affected by developmental truncation. A comparison with the skeletal development of a close relative, the zebrafish Danio rerio, demonstrates that the majority of the absent bones or skeletal structures in Paedocypris are those that appear late in the ossification trajectory of the zebrafish. Thus, their absence in Paedocypris seems to be due to the simple developmental truncation of terminal stages in the ossification sequence. Our study of the sexually dimorphic structures in Paedocypris demonstrates that predominantly the male exhibits the more complex state. In relation to the female, male Paedocypris uniquely possess a cleithrum with a pointed posterior process that covers the scapula laterally, and a more medially situated posterior flange that contacts the dorsal area of the coracoid; a massive and heavily ossified uppermost pectoral radial tightly bound to the scapula; thickened and enlarged three uppermost pectoral-fin rays; a large triangular, dorsolaterally directed process on the outer arm of the massive os suspensorium; and a enlarged and shovel-like anterodorsally directed basipterygium; and a hypertrophied first pelvic-fin ray with additional anterior flanges that support keratinized pads of skin. Female Paedocypris show only one structure that is better developed than in males: the first proximal-middle radial and the anteriormost fin ray of the dorsal fin are more massive and more heavily ossified. Although the function and biological role of these dimorphisms is still unknown, we hypothesize that they are related to a special reproductive behavior. Paedocypris is a prime example for the recent claim that miniaturization among cyprinids is associated with evolutionary novelty only in developmentally truncated miniatures and not in proportioned dwarfs. Paedocypris offers a strong challenge to Schindleria as the most extreme example of developmental truncation known among fishes. We highlight the difficulties that developmentally truncated taxa frequently pose to the resolution of their phylogenetic position and propose an approach to overcome this problem. Our phylogenetic comparison to determine the systematic position of Paedocypris among cyprinids reveals that it shares not only a number of unique absences, but also highly unusual progressive characters with Sundadanio and Danionella, two other Asian miniature cyprinids. We hypothesize that the three genera form a monophyletic group. We further found that Paedocypris and Danionella share a number of uniquely derived characters pointing to a sister g...

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“…The anatomy and function of the Weberian apparatus of the Siluriformes has received a large amount of attention from ichthyologists (Reissner, 1859;Sarensen, 1890;Bridge & Haddon, 1894;Chranilov, 1929;Tilak, 1963Tilak, , 1965Alexander, 1964Alexander, , 1965Chardon, 1968;Fink & Fink, 1981). Some features of the Weberian apparatus of the Siluriformes, such as the loss of the intercalarium articular process as vertebral centra 2, 3 and 4 fused into a complex centrum, are specializations of these groups (Fink & Fink,198 1).…”

Section: Weberian Apparatus and Axial Skeletonmentioning

confidence: 99%

Anatomy and phylogenetic analysis of the neotropical callichthyid catfishes (Ostariophysi, Siluriformes)

Reis

1998

Zoological Journal of the Linnean Society

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Based mainly on morphological characters, the phylogenetic relationships among genera and some species groups of the neotropical family Callichthyidae were examined. A study of the osteology of a generalized callichthyid, Callichthys callichthys (Linnaeus), with detailed comparisons among representatives of the remaining genera in the family, is presented and used as a basis for the phylogenetic analysis. A single most parsimonious tree supported the monophyly of the family Callichthyidae based on 28 derived features and the division of the family in the subfamilies Corydoradinae and Callichthyinae. In the subfamily Corydoradinae, the genus Aspidoras is the sister-group of the clade formed by Colydoras plus Brochis. Five derived features support the monophyly of this clade and four support the monophyly of Brochis. No characters, however, were found to support the genus Colydoras. In the subfamily Callichthyinae, &anma and Hoplosternum are sister-taxa. Megalechis represents the sister-group of Dianema plus Hoplostmum and Lepthoplosternum represents the sister-group to Megalechis plus Dianema plus Hoplostmum. Finally, Callichthys is considered the least derived member of the subfamily, and is hypothesized as the sister-group of the remaining species. A key to all callichthyid genera is provided.

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Contributions to the anatomy of fishes. II. The air-bladder and Weberian ossicles in the siluroid fishes

Cited by 37 publications

References 0 publications

Comparative morphology and evolution of the lungless caecilian Atretochoana eiselti (Taylor) (Amphibia: Gymnophiona: Typhlonectidae)

Comparative morphology and evolution of the lungless caecilian Atretochoana eiselti (Taylor) (Amphibia: Gymnophiona: Typhlonectidae)

Osteology of Paedocypris, a miniature and highly developmentally truncated fish (Teleostei: Ostariophysi: Cyprinidae)

Anatomy and phylogenetic analysis of the neotropical callichthyid catfishes (Ostariophysi, Siluriformes)

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