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An example of a parietal fused with an intertemporal and an example of concrescence of a parietal with an extraintertemporal in the metamorphic stages of the Lower Permian seymouriamorph are described. It is concluded that it is necessary to take account of phylogenetic fusion of two or more original components in the formation of the skull roofing bones in different phylogenetic lines of vertebrates;...
Des méduses, uniquement connues jusqu'ici dans les bassins germaniques, ont été découvertes dans le Permien français (bassin de Saint-Affrique). Comme en Allemagne, l'espèce Medusina atava (Pohlig, 1892) Walcott, 1898, y caractérise un paléoenvironnement fluvio-lacustre. Par contre, dans les deux pays, la seconde espèce Medusina limnica Müller, 1978 est associée à des paléoenvironnements différents...
Les calcaires tectonisés de San Juan Ihualtepec (Oaxaca, Mexique) contiennent fusuline schwagérinoïdesParafusulina deliciasensis (= P. maleyi). Ils permettent de dater les couches du Wordien inférieur ou moyen (zones PG2 ou PG3 de Wilde, 1990). Grâce à ce microfossile une paléogéographie du Wordien peut être dessinée en Californie, au Texas et dans les Etats mexicains de Coahuila, Sonora, Guerrero...
Nous décrivons les triopsidés (Crustacea, Branchiopoda) qui abondent dans les faciès “saxoniens” de la Formation du Salagou du bassin de Lodève daté “Thuringien” ou “Saxonien” selon les auteurs. A partir de milliers de débris de carapaces, d'axes thoraco-abdominaux et plus rarement à partir d'animaux entiers, nous avons identifié et décrit deux espèces nouvelles: Triops cancriformis permiensis nov...
This paper completes the taxonomic description of the recently discovered Permian “Glossopteris”taphofloras from Carapacha Basin and compares its entire paleofloristic assemblage with other known Permian plant associations from Argentina. Carapacha Basin was a halfgraben located in the southern region of La Pampa province (central Argentina) that received fluvial/lacustrine sediments from Early Permian...
Les calcaires de la Formation Chóchal du Permien du Guatemala (Amérique Centrale) sont riches en algues et foraminifères. Les espèces suivantes de dasycladales: Clavaporella americana, Connexia slovenica, de petits foraminifères: Neoendothyra sp. et de fusulines Eoverbeekina americana, Pseudoreichelina discoidea, Schubertella muellerriedi, Pseudofusulinoides chixoyensis nov. sp., Skinnerella gruperaensis,...
Actinodon frossardi from the Lower Permian of Muse (Muse formation), Autun basin (France), represents a valid species and it is referred for the first time to the eryopid genus Onchiodon. Actinodon is a junior synonym of Onchiodon. The family name Actinodontidae is no longer used, as Onchiodon belongs to the Eryopidae. Actinodon brevis from the Muse formation of Dracy-St-Loup (France) is a synonuym...
Les calcaires de la Formation San Salvador Patlanoaya (Mexique) livrent six biozones à fusulines. Les principaux genres permettant de dater sont des Triticites et des Kansanella du Missourien et du Virgilien inférieur (Carbonifère supérieur), des Pseudofusulina et des Rugosochusenella du Wolfcampien (Permien inférieur) et des Paraskinnerella et des Skinnerella du Léonardien moyen. Les différentes...
Permian microfloras occur in limestone boulders of the Aseelah Unit at the lower part of the Batain Group (NE Oman). The boulders are composed of bioclastic limestones deposited during the Permian on a shallow marine warm shelf environment. They yield several rich associations of Dasycladales, tubiphytids and Archaeolithophyllaceae indicating a Yakhtashian to Dzhulfian age (dated by fusulinids). The...
La coupe permienne de Guardia Pisano (Region du Sulcis, Sud-Ouest de la Sardaigne) presente deux sequences separees par une discordance. De bas en haut nous observons : 1) une sequence inferieure grisatre, composee de niveaux argilo-greseux a restes de plantes, riches en particulier en sporomorphes, de milieu fluvio-lacustre a palustre ; suivent vers le haut des volcanites et volcanoclastites rhyolitiques...
This work describes stage by stage the biostratigraphy of the Middle to Late Permian in Mexico and Guatemala. Roadian deposits are very poorly represented, as a consequence of tectonic movements at the end of the Kungurian/Leonardian stage. In fact Middle and Late Permian deposits are almost completely lacking in South Mexico and the whole Latin America, due to a probable climatic barrier. The main...
Newly discovered fossil localities in coarse-grained deposits of the Pennsylvanian and Permian Antler overlap assemblage in the southern Shoshone Range, north-central Nevada have yielded a low-diversity assemblage consisting chiefly of a new species of chonetoidean brachiopod: Dyoros (Lissosia) nevadaensis nov. sp. The subgenus Dyoros (Lissosia), is known from Leonardian and lower Guadalupian strata...
The Jisu Honguer Formation (''Zhesi Formation'') is a North China marine carbonate unit of Permian age containing a mixed fauna of Tethyan, Boreal and endemic elements. The age of the Jisu Honguer Formation has been thought to range from Artinskian to Kazanian based on previous studies using mostly benthic macrofossils. A typical Mesogondolella aserrata conodont fauna is reported from the lower part...
The San Salvador Patlanoaya section (Puebla State, Mexico) is known for its richness of many fossil groups. Among them, the calcareous shells have been principally investigated. This paper deals with Missourian–Virgilian (Late Pennsylvanian) and Leonardian (late Early Permian) Mexican fish remains. A discussion about Helicoprion and related genera, is followed by the systematic description of the...
This paper presents the first Permian ostracod fauna discovered in Thailand. The ostracods are recovered from the Tak Fa Limestone (Middle Permian) in Phetchabun province, central Thailand. The ostracods belong to eight genera and 15 species. Four species are newly described: Sargentina phetchabunensis nov. sp., Geffenina bungsamphanensis nov. sp., Reviya subsompongensis nov. sp. and Bairdia takfaensis...
Sinoporella leei was first described and illustrated by Yabe in 1949 as a new species and was ascribed to a new subgenus of the genus Triploporella (Steinmann). This alga was not illustrated again until Mu published 25-years later a photomicrograph of a longitudinal-tangential section. The recent finding of new specimens in Permian strata of the Guangxi region (South China) allows us to better illustrate...
This paper deals with Neocalamites tubulatus nov. sp., an equisetophyte belonging to the Equisetaceae family. The material studied originates from the Upper Permian deposits of the northern part of European Russia. N. tubulatus nov. sp. is characterized by both sterile and fertile organs belonging to the same parent plant. It has long, flexible stems, rarely branched, with alternating nodes and prolonged...
A palaeontological record of the Northern Caucasus provides new data to evaluate the influence of the Permian/Triassic mass extinction on brachiopod communities. The study region is currently located in the southwest of Russia; it laid on the northern margin of the Palaeo-Tethys Ocean during the late Paleozoic-early Mesozoic. A total of 168 genera and 36 superfamilies are known from the Changhsingian-Bajocian...
A nearly complete specimen of a sarcopterygian fish from the Lower Permian (Autunian) of the Saar-Nahe Basin, southwest Germany, is described as a new genus and species of megalichthyids, Palatinichthys laticeps. It is characterized by the following unique list of characters: (1) lacrimal forms lateral margin of external naris, (2) postparietal short with respect to parietal, (3) tabular broad and...
A new genus and species, Vetlugospermum rombicum, belonging to the peltaspermalean gymnosperms is described. Vetlugospermum nov. gen. and Navipelta are placed into the new family Vetlugospermaceae. General problems of peltasperm systematics and relationships between the different genera from the Permian and Triassic are discussed.
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