Bryozoaires des Peuplements Sciaphiles de Méditerranée: Révision de Cribrilina setosa Waters et Description de Deux Nouvelles Espéces de Cribrilaria (Bryozoa, Cheilostomata)

The cribrimorph bryozoan Puellina setosa (Waters) is reviewed, together with a closely related species, Puellina gattyae (Busk), and two new Cribrilaria species from the Mediterranean, C. cassidainsis sp. n. and C. minima sp. n., which present some characters in common with P. setosa and were previously confused with it.     

Structure larvaire et histogenèse post-larvaire chez Crista denticulata (Lamarck) (Bryozoa, Cyclostomata, Articulata)

The larval structure and the first stages of the post-larval morphogenesis in the Cyclostomatous Bryozoa Crisia denticulata (Lamarck) have been studied with aid of electron microscopy. The various types of cells are described and defined according to a previously proposed terminology; their destiny during the metamorphosis is indicated.     

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.     

Étude chimiotaxonomique de deux espéces nouvelles de Hazunta (Apocynaceae)

Twenty-two indole alkaloids have been isolated from two new Hazunta species (Apocynaceae). Apparently, five of them are bis-indoles of a previously unknown structure.     

Anomalies morphologiques chez le genre Acartia (Crustacea, Copepoda): description et essai de quantification

We have found morphological anomalies in the fifth pair of thoraciclegs of female Acartic clausi and A. discaudata, sampled inthe harbour at Dunkirk (France), in the eastern English Channeland in the North Sea. The percentage of anomalies in A. clausi(<1%) is not significantly different between polluted andnon-polluted sites. The frequency of anomalies is on the otherhand clearly higher in A. bilfilosa (>20%) than in A. clausi.     

Polychromatisme et polymorphisme biochimique chez cinq espèces de phasianidés

A correspondence between egg shell polychromatism and polymorphism of egg white proteins is presented and discussed in five related species of Phasianidae: Coturnix coturnix japonica, Lophortyx californica, Perdix perdix, Alectoris rufa and Phasianus colchicus.     

Les Megacricetodon du gisement karstique miocène moyen de Blanquatère 1 (Pyrénées-Orientales, Sud de la France) : nouvelles espèces, implications biochronologique et phylogénique

Three Megacricetodon species are recognized in the Middle Miocene locality of Blanquatère 1 (Languedoc-Roussillon province, France). Two are new, the small-sized M. tautavelensis nov. sp. the medium to large-sized M. aunayi nov. sp., the third one being the already known M. “collongensis-gersii”, a medium-sized species found in other Miocene localities of the area. Size and morphology differentiate these species. Such a high number of contemporaneous species of the genus Megacricetodon is found for the first time in a Miocene locality in the region and indicate that the evolution of this genus in western Europe is likely more complicated. It may testify both of a biogeographical differentiation and of migration events. According to our calibration charts, the deposit is dated ca. 16 Ma ago. The position of Vieux-Collonges (MN 5) and Sansan (MN 6) on the biochronological scale is also discussed, as well as the estimated age of the biozonal boundaries MN 3/MN 4, MN 4/MN 5 and MN 5/MN 6.     

Colony–Substratum Relations in Scrupocellariidae (Bryozoa, Cheilostomata)

In the Bryozoa in general the colony is attached by means of the primary zooid, the ancestrula, which is permanently cemented to the substratum. The attachment is brought about, in the marine bryozoans, by the larva everting its interior sac into a basal adhesive disc secreting a thin layer of hardening mucus. In Scrupocellaria reptans no adhesive disc was found. The metamorphosing larva is fixed to the substratum by a column of loose, sticky secretion. This primary fixation is ephemeral and replaced by a secondary, permanent fixation by one pair of rootlets. Thus, the ancestrula body proper and the colony arising from it become permanently free from the substratum but anchored to it by rootlets, the primary pair and series of secondary rootlets. This unique and certainly secondarily evolved type of attachment is apparently realized in the Scrupocellariidae in general, to a more or less perfect degree. It appears as one of several possible models to meet efficiently with environmental disturbances.     

Sur deux espèces d'Arrenurus s. str. (Acari,Prostigmata) nouvelles pour la Faune française: Arrenurus (Arrenurus) rodrigensis Lundblad 1954 et Arrenurus (Arrenurus) furcillatus Viets 1930

Sans résumé     

Variabilité et différenciation génétiques chez cing espèces d'ecrevisses Astacidae

Analysis of fifteen loci encoding enzymes has shown an important differentiation between five European and North American species of the Astacidae. Evaluation of the genetic distances revealed that closely related species are on the one hand, Orconectes limosus and Procambarus clarkii and, on the other, Astacus astacus and Astacus leptodactylus. This analysis brings no genetic justification for the separation of these five species into two sub-families. However, the distinction between the genera Astacus and Austropotamobius seems confirmed. The possibility of a correlation between heterozygosity and oxygen consumption is evocated.     

Pigments et salinité chez Porphyridium

Pigments and salinity in Porphyridium.—An opal glass light transmission method is used for estimating the proportions of pigments in Porphyridium sp. Lewin, grown in artificial media. The cells show an Increase in chlorophyll/B–phycoerythrin ratio in media twice or thrice as saline as sea water, Chlrophyll/carotenoïds ratio is low in media the salinity of which is either low or high. In the case of phycoerythrins, light–absorption ratio at 500 nm and 545 nm vary also with the salinity. Une méthode de mesure par transmission de lumière á travers des lames opalines est utilisée pour évaluer les proportions de pigments chez Porphyridium sp. Lewin cultivé milieux artificiels. Les cellules montrent une augmentation du rapport chlorophylle/B.-phycoérythrine dans les milieux deux outrois fois plus salés que l'eau de mer. Le rapport chlorophylle/carotenoïdesest faible dans les milieux dont la salinityé est soit faible soit élevée. Dans le cas des phycoérythrines, le rapport des absorptions de lumière à 500 nm et 545 nm varie aussi avec la salinityé.