Une nouvelle algue Dasycladacee du Portlandien du Jura meridional francais: Montenegrella florifera nov. sp.

New Dasyclad Alga belonging to the genus MontenegrellaSOKAC & NIKLER, 1973, named M. florifera nov.sp. It is the first species of this genus described before the Cretaceous, in the Portlandian limestones of the southern french Jura mountains.     

Premiere decouverte d'une faune de petits mammiferes dans le Paleogene du bassin d'Aurillac (Cantal): Implications stratigraphiques

The so-called “série carbonatée” of Aurillac-Arpajon basin is generally ascribed to the upper Oligocene; a newlydiscovered micrommalian fauna shows that the basis of this sequence is really older and at least of a middle oligocene age.     

Note preliminaire concernant la decouverte d'une faune et d'une flore du niveau de Ronzon dans l'Oligocene inferieur du Bassin d'Aquitaine

The new locality of Ruch (Gironde), from a lateral facies of the “Calcaire de Castillon” formation has yielded an important flora and fauna. From the biostratigraphic point of view the mammalian fauna allows to show that Ruch is contemporaneous of the reference locality of Ronzon (Auvergne).     

Une nouvelle espece d'algue dasycladale: Terquemella concava nov. sp., dans les calcaires a “tubulures” d'age portlandien de la Cluse-des-Hopitaux (Jura meridional)

In the portlandian limestones of the southern Jura mountains (Cluse-des-Hôpitaux), a dasyclad algae level provides a new species: Terquemella concava nov. sp., characterized by its sub-hemipheroidal shape. The type-level is made up of a burrowed biomicrite. The in-filling of the burrows consists of grains with meniscus cements, attesting of a vadose diagenesis of the bed.     

Presence de pollens d'Hamamelis (Hamamelidaceae,Angiospermae) dans le pliocene du Sud de la France

Pollen-analysis shows the presence of the genus Hamamelis in the pliocene flora of southern France. It contributesto the knowledge of the past distribution of taxa which are now extinct in western Europe.     

L'age des “Calcaires a petites huitres” de l'Ile Cremieu (Jura meridional tabulaire); Correlation des formations du Bajocien superieur de la region lyonnaise

Parkinsonids (Ammonitina) of the Subfurcatum Zone (Upper Bajocian) were found in the “Calcaires à petites huitres” formation from the northern part of Ile Crémieu. Correlations are established between different Upper Bajocian lithostratigraphic units of Mont d'Or lyonnais, Ile Crémieu and folded Jura.     

Du probleme de l'origine des Dinosauriens d'apres les donneesde l'ichnologie du Trias

With the data of the osteological paleontology and these of the ichnology, the authors attempt to restore the biotopes where lived the trackmakers, biotopes which have favoured in the Triassic the evolution and the expansion of the Archosaurs, the specialized Reptiles in the easy and rapid locomotion. They pointed out that the chirotheroid footprints cannot be attributed at all events to the Pseudosuchians and they come to the conclusion that Dinosaurs and Pseudosuchians, as separated groups, are appeared as early as the lower Triassic.     

Description de quelques nouvelles espèces de Follicucullidae et d'Entactinidae (Radiolaires polycystines) du permien du Japon

Six new species of radiolarians from the Upper Permianof Kamigori (SW Japan) are introduced. They represent a part of a rich fauna, the whole of which will be detailed in an other paper.     

Présence d'Eryma bedelta (Crustacea Decapoda) dans le Bajocien du Maroc oriental

The value attached to the presence in Morocco of aspecies which is essentially North-European, is increased by its recent discovery in an Iranian deposit. The stakes, in that established, have to be pointed out and reserved in order to try, in the future, to reconstruct the dispersion areas of the representatives of this genus, especially adapted to the Jurassic seas.     

Winwaloeusia,genre nouveau d'Acritarche du Devonien

Any Acritarchs that previously were included in the genus Veryhachium (DEUNFF 1954) are transferred in the new genus Winwaloeusia.     

Éléments de biogéographie et d'écologie desMollusques Quaternaires et actuels du banc d'Arguin (Mauritanie)

Situated in arid area, the «banc d'Arguin landscomposes a littoraly and sandy biotope. Some stony headland could be found on the sea side.The malacofauna belongs to the senegalian type but look impoverished. Therefore, one can found some lusitanian species mainly on stones and six endemic species of the senegalo-mauretanian littoral. With the same lusitanian influences and the same endemic species, the quaternary fauna looks like the actual one belonging to the senegalian type.     

Regulation d'activité de l'α-Amylase à différentes températures d'adaptation et en fonction de l'ablation des pédoncules oculaires et du stade de mue chez Palaemon serratus

The influence of thermal acclimatisation of the shrimp Palaemon serratus on the specific activity of α-amylase and the soluble proteins of the hepato pancreas show the presence of a metabolic compensation kinetic within this organ. The kinetic properties of partially purified α-amylase show that 2 sites are able to fix starch in the absence of NaCl but only 1 site when NaCl is present. The importance of conformational changes of the enzyme is shown by examining its regulatory properties according to the different temperatures of adaptation, and to the removal of eyestalks and the molt cycle. During these changes there are no qualitative variations in α-amylase isoenzymes.     

Sur les conditions de gisement de l'ichthyofaune oligocene d'Aix-en-Provence (Bouches-du-Rhone): Essai de definition d'un modele paleoecologique et paleogeographique

The study of the fossil fishes preserved in 19 successive fossiliferous beds sampled while excavating in the city ofAix-en-Provence permits the elaboration of a sedimentary model for the Oligocene gypsiferous marls. These seem to have been deposited on a coastal plain, in continental waters characterized by a fluctuating, very low, salt-content.