Les genres et sous-genres de Chaetodontidés étudiés par une méthode d'analyse numérique

Mauge, A; Bauchot, Roland

doi:10.5962/p.285929

Cited by 3 publications

References 2 publications

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The brain organization of butterflyfishes

Bauchot

Ridet

Bauchot³

1989

The Butterflyfishes: Success on the Coral Reef

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SynopsisThe encephalization indices of angelfishes (Pomacanthidae) and butterflyfishes (Chaetodontidae) are typical of advanced perciform fishes: both families lie in the upper part of the polygon of teleost indices, The chaetodontids seem to be a little more encephalized than pomacanthids. The general morphology of the brains in both families is very similar: small olfactory bulbs, large optic tectum and a cerebellum which covers the brain structures in front of it like a cap. This morphology is shared by another family of the coral reef biotope, the Acanthuridae, The histological architecture is also typical of advanced teleosts, with a cortexlike pallium, a laminated nucleus geniculatus (= pretectalis superficialis), a complex valvula cerebelli and a corpus glomerulosum with a clear neuropile centre. The quantitative analysis of the main subdivisions of the brain, either from relative volumes or from indices, shows small olfactory bulbs (microsmy) but important telencephalic and diencephalic centres, large tectal centres (vision) and large cerebellum (precise locomotion). Many of these peculiarities are shared by other fishes inhabiting coral reefs. The differences between the two families seem to be primarily correlated with food habits: the angelfishes, which are sponge-feeders and may have an overweight due to the ballast of the sponge-skeleton in their digestive tract, and which do not need either such good vision or such precise locomotion to pick up their prey, could be a little less encephalized than the butterflyfishes.

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The brain organization of butterflyfishes

Bauchot

Ridet

Bauchot³

1989

The Butterflyfishes: Success on the Coral Reef

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Biogeography of the chaetodontidae: an analysis of allopatry among closely related species

Blum

1989

Environ Biol Fish

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SynopsisA recent survey of chaetodontid osteology has produced a hypothesis of relationships among 22 osteologically distinct genera and subgenera . Fourteen supra-specific taxa have distributions that are Indo-Pacific or larger . Most sister taxa inferred by osteology are broadly sympatric . The basal dichotomy within the large genus Chaetodon contrasts monophyletic groups centered in the Atlantic and Indo-Pacific with little overlap .Divergence of Atlantic and Indo-Pacific distributions is correlated with the closing of the Tethys seaway 18-13 million years ago . Distributional data of Burgess (1978) and Allen (1980) are reevaluated in the context of putative species pairs and complexes . Species in nearly two thirds of these complexes (18 of 31) are distributed allopatrically . Eight complexes are examined in more detail . Five of these eight contain at least one peripherically isolated species . Distributions of species in four complexes indicate that previously wide-spread species were cleaved more symmetrically . Sympatric distributions within two species pairs indicate that the more narrowly distributed species in each pair arose through central isolation within a broadly distributed ancestor . The area of central isolation corresponds to the classical center of origin . A new hypothesis of vicariance followed by dispersal may partially explain the diversity gradient so prominently featured in dispersal-oriented tropical marine biogeography .

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