Experimente zur Nasenentwicklung der Regenbogenforelle (Salmo irideus W. Gibb.)

Teichmann, Harald

doi:10.1007/bf00573901

Cited by 10 publications

(3 citation statements)

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“…Although we still lack a complete survey, the common position of the olfactory placode and the developing nasal sac in early ontogeny of Dipnoi, Actinopterygii and Tetrapoda appears to be a ventrolateral one (Gawrilenko 1910;Matthes 1934;Teichmann 1962Teichmann , 1964Bertmar 1969). This is identical to the position of the olfactory system in adults of all living plagiostomes.…”

Section: Models For 'Phylogenetic Inpouching' Of the Snoutmentioning

confidence: 86%

“…The epithelial region of the presumptive internal nostril of tetrapods is fixed in its ventral position, and the socalled choanal tube is formed either by the naso-buccal groove (Amniota) or by the 'choanal' and 'gut processes' (Amphibia), which connect the primary nasal pit to the embryonic gut (see Wilder 1925; Teichmann 1962; Bertmar 1 9 6 6~; Bjerring 1989a for surveys). The anterior and posterior nasal openings of Actinopterygii have no identity as separate anlagen before they are definitely formed by subdivision of the primary nostril, which occurs after the ontogenetic shift of the olfactory placode into a dorsolateral position (Teichmann 1964). Similarly, the external nostril and 'choana' cannot be traced back to separate definite openings of the actinopterygian and dipnoan olfactory organ, either in embryology or in phylogeny.…”

Section: Models For 'Phylogenetic Inpouching' Of the Snoutmentioning

confidence: 99%

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Development of the Snout of the Australian Lungfish Neoceratodus forsteri (Krefft, 1870), with Special Reference to Cranial Nerves

Bärtsch

1993

Acta Zoologica

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The anatomy and embryology of the dipnoan snout and olfactory organ play a major role in the discussion about the phylogenetic position of Dipnoi and the question of ancestry of Tetrapoda. This is primarily due to the fact that an internal nostril is regarded as an important preadaptive organ of the ancestors of tetrapods. Two conflicting scenarios of phylogenetic change were proposed in favour of different hypotheses of relationship. One emphasizes the similarities between Dipnoi and Chondrichthyes concerning this complex of characters. The other supports the idea of a close relationship of Dipnoi and Tetrapoda and a common origin of a ‘choana’ from the posterior external nostril of fishes. Accordingly, there is need for a detailed embryological and anatomical study which could help to clarify homologies and the basis of character evaluation. This, in the first place, concentrates on Neoceratodus forsteri. A plate reconstruction of the larval head provides many new insights which are important for comparison with the lepidosirenid lungfishes Protopterus and Lepidosiren and with other vertebrate taxa. The value of the peripheral nervous system as a topographical reference is critically reviewed. The results support the hypothesis that lungfish form a ‘primitive’ teleostomate group, closely adjoining Chondrichthyes in many characteristics of the snout formation. The relations between cranial nerves in the snout and the developing nasal sac, however, do not support the conclusion that the recent selachian condition is the exceptional ancestral character state of the lungfish snout. Dipnoi lack a ‘choana’, but nevertheless a closer relationship to tetrapods is not excluded. A vestigial and transitory naso‐buccal connection in larvae of Neoceratodus might indicate such common ancestry, but has a completely different functional significance among fishes. It is shared with several plagiostomes and is, therefore, probably not useful as a synapomorphy of Dipnoi and Tetrapoda.

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Section: Models For 'Phylogenetic Inpouching' Of the Snoutmentioning

confidence: 86%

Section: Models For 'Phylogenetic Inpouching' Of the Snoutmentioning

confidence: 99%

Development of the Snout of the Australian Lungfish Neoceratodus forsteri (Krefft, 1870), with Special Reference to Cranial Nerves

Bärtsch

1993

Acta Zoologica

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“…However, neither in this nor in his other paper did he give any evidence of his opinion of nonhomology between the internal nostril of Astroscopus and the choana. Teichmann (1964) did not try to compare the morphogenesis and position of the tetrapodean choana and accessory nasal sacs in fish, and it is probably for this reason that he used quotation marks around the words homologous and choana. As a matter of fact, neither Atz nor Teichmann have published any decisive opinion on the structural evolution of the choana.…”

mentioning

confidence: 99%