Etude Des Modifications Encéphaliques Observées Chez Les Insectivores Adaptés À La Recherche De Nourriture en Milieu Aquatique

Bauchot, Roland; Stephan, Heinz

doi:10.1515/mamm.1968.32.2.228

Cited by 51 publications

(40 citation statements)

References 16 publications

(30 reference statements)

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“…According to Sorenson (1962), mutual tolerance characterizes this species: no deposition of feces at specific sites and no defense of a territory or of a nest have been observed. In addition to the fact that wateradapted species generally have a reduced olfactory system (e.g., Bauchot and Stephan, 1968;Stephan and Kuhn, 1982;Baron et al, 1983), the reduced olfactory organ in S. palustris parallels a less extensive use of olfactory signals. As in Neomys, which has a smaller home range than terrestrial soricids (Illing, 1981), food abundance would favor higher-density populations in S. palustris.…”

Section: Discussionmentioning

confidence: 99%

Comparative morphology and morphometry of the nasal fossae of four species of North American shrews (Soricinae)

Larochelle

Baron

1989

Am. J. Anat.

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The present study compares the morphology of the nasal conchae and the relative development (i.e., surface area and neurosensory cell number) of the olfactory epithelium between four species of shrews occupying different ecotopes (Blarina brevicauda, Sorex cinereus, S. fumeus, S. palustris). The number of olfactory cells was corrected for split cell error. Data were analyzed by using size indices based on the allometric method. The convoluted shape of the maxilloturbinal in Blarina, with large respiratory epithelial surface area, could not be related with certainty to the subterranean ecotope. From the comparison between Soricinae and Crocidurinae, one major difference concerned the shape and attachment of ectoturbinal 3. Differences in the relative development of the olfactory organ are discussed with regard to differences in the use of chemical signals. The semi-fossorial B. brevicauda, with the more developed olfactory organ, is reported to possess more scent-glands and to manifest active scent-marking behaviors and fecal deposits associated with territoriality. The two terrestrial species, S. cinereus and S. fumeus, have olfactory epithelia showing an intermediate development. Published accounts of fewer scent-glands and a lack of active scent-marking behavior indicate a lesser use of olfactory communication in these two species where mutual avoidance seems the rule. Indication of an even more reduced use of olfactory signals in social interactions by the semiaquatic S. palustris is suggested by its least-developed olfactory epithelium. The comparison between Soricinae and Crocidurinae supports a relationship between the development of the olfactory organ and the relative use of olfactory communication known to occur in social interactions.

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Section: Discussionmentioning

confidence: 99%

Comparative morphology and morphometry of the nasal fossae of four species of North American shrews (Soricinae)

Larochelle

Baron

1989

Am. J. Anat.

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“…In Prorastomus , a stem sea cow, the olfactory bulbs are still large ( table 1 ) but the trigeminal nerves are also large ( fig. 4 d), as in extant Dugong and most aquatic mammals, suggesting intensive snout sensory perception [Bauchot and Heinz, 1968;Pirlot and Kamiya, 1985]. The EQ tends to decrease in Sirenia ( fig.…”

Section: Macroscelidea and Tenrecoidea (Afroinsectivora)mentioning

confidence: 90%

“…The olfactory bulbs are relatively large except in Potamogale , probably because of adaptation to aquatic lifestyle [Bauchot and Heinz, 1968]. Among Macroscelididae, Rhynchocyoninae have the more voluminous olfactory bulbs ( table 1 ).…”

Section: Macroscelidea and Tenrecoidea (Afroinsectivora)mentioning

confidence: 99%

A Memory Already like an Elephant's? The Advanced Brain Morphology of the Last Common Ancestor of Afrotheria (Mammalia)

et al. 2013

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Virtually reconstructed and natural endocranial casts are used in the study of brain evolution through geological time. We here present work investigating the paleoneurological evolution of afrotherian mammals. Using microCT-generated endocasts we show that, with the exception of the subfamilies Macroscelidinae and Tenrecoidea, most Afroinsectiphilia display a more or less gyrencephalic and ventrally expanded neopallium, two derived features that are unexpected for these insectivore-grade afrotherians. This implies that the endocranial cast morphology at the root of the afrotherian clade may have been more advanced than previously thought. The reconstructed endocranial morphology of the Afrotheria's last common ancestor reaches the level of complexity of some early Cenozoic archaic ungulates. Our result gives support to the hypothesis of an ungulate-like ancestral body plan for Afrotheria. It also implies that the a priori ‘primitive' suite of traits evident in the brain of Afroinsectivora, especially in the tenrecs, may have been secondarily acquired. Implications on the overestimation of the divergence age of Afrotheria are discussed.

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“…Data on the five fundamental brain parts were given for the first time by for Tenrec and Setifer and then several times for the four tenrecine species in comparisons with other Insectivora and with Primates (Stephan 1966(Stephan , 1967aBauchot and Stephan 1968;Stephan et al , 1981). The largest differences in the four species of Tenrecinae are found in CER, which is about 1.7 times larger in Hemicentetes than in Echinops (133 versus 78, see Table 11).…”

Section: Volume Measurementsmentioning

confidence: 99%

“…For example, in Insectivora, the form and size of the brain may change in relation to a particular substrate adaptation (Spatz and Stephan 1961;Stephan and Spatz 1962). Other studies have shown that the most reduced olfactory bulbs are found in semiaquatic forms regardless of their taxonomic affiliation Bauchot and Stephan 1968;Stephan and Kuhn 1982;Baron et al 1983). Since, in mammals, olfaction is linked with breathing, it is of no use in detecting prey under water.…”

Section: Introductionmentioning

confidence: 96%

Insectivora

Stephan

Baron

Frahm

1991

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Etude Des Modifications Encéphaliques Observées Chez Les Insectivores Adaptés À La Recherche De Nourriture en Milieu Aquatique

Cited by 51 publications

References 16 publications

Comparative morphology and morphometry of the nasal fossae of four species of North American shrews (Soricinae)

Comparative morphology and morphometry of the nasal fossae of four species of North American shrews (Soricinae)

A Memory Already like an Elephant's? The Advanced Brain Morphology of the Last Common Ancestor of Afrotheria (Mammalia)

Insectivora

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