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Most of the remains of the small pleistocene equid of Binagady usually considered as an E. hydruntinusmay be referred to a new subspecies, E. hemionus binagadensis. A few teeth and bones really resemble E. hydruntinus. In the holocene of the plain of Qazvin, beside numerous remains of an average Hemione, there are several first phalanges similar to those of E. hemionus binagadensis, and several teeth...
Some 2379 conodont specimens have been recovered from 50 samples through the 560 m thick BowanPark Group and the basal part of the Malachi's Hill Beds of Late Ordovician age, from the western side of the Molong high, in central New South Wales. These have been assigned to 32 species including three new species, Panderodus nodus nov. sp., Paroistodus? nowlani nov. sp. and Yaoxianognathus ani nov. sp...
Les grands ensembles actuels de végétation méditerranéenne, compte tenu de leur valeur historique,peuvent au moins en partie, être mis en parallèle avec ceux qui se sont succédés depuis la fin de la phase würmienne. Les actuelles forêts pré-steppiques, les formations pré-forestières et les forêts proprement dites, permettent de comprendre quelle a dû être l'évolution progressive des structures arborées,...
A correlation between the charophyte index-species Raskyella peckii and the biozonation of larger foraminifera (Shallow Benthic Zones SBZ 13 and SBZ 18) is proposed, which results in a widening to about 6 MA of the present known chronostratigraphic range of the charophyte species. The new range is Early Lutetian to Late Bartonian. This leads to a significant modification in charophyte biozonation...
Une abondante faune de Scléractiniaires a été étudiée à partir d'un nouvel affleurement du Miocènemoyen (Serravallien) de Pessac (Gironde, SW France). Elle comprend plus d'une quinzaine de taxons, avec une diversification notable dans les genres Flabellum et Balanophyllia; 10 de ces taxons sont nouveaux pour le Miocène d'Aquitaine. C'est probablement l'association la plus riche récoltée dans le Serravallien...
The new family Lapeyriidae of Odonatoptera, based on a new genus and species from the Upper Permian of Lodévois (France) is the sister group of Nodialata. It represents an evolutionary link between the venation type of the Paleozoic Meganisoptera and that of Odonata. Even if the present discovery demonstrates that the fossil record of the Odonatoptera remains imperfectly known, the present state of...
Planktonic Foraminiferida originated in the Triassic[?] or Early Jurassic but only expanded markedly in the Early to mid-Cretaceous. It is during the mid-Late Cretaceous that they evolved into a wide range of morphotypes and were able to colonise a much greater range of environments and regions. During the mid-Cretaceous, in particular, they developed a range of strategies which allowed them to move...
The Ordovician was the most significant Period in bivalve diversification. From a small Cambrianstock of palaeotaxodonts, the most fundamental radiation occurred in the early Ordovician. An intrinsic factor was the most significant, involving the evolution of the feeding gill within the palaeotaxodonts. This fundamental morphological change allowed development of more effective feeding strategies,...
The overall pattern of ancient diversifications was apparent more than a century ago, and since thenhas shown no basic change. This suggests that the fossil record is both robust and reliable. Yet many questions remain to be answered. The recent surge of interest in mass extinctions, for example, has emphasized the causes of trauma and the victims involved. Relatively less attention has been paid...
L'analyse de deux séquences régionales de France, l'une du Dévonien en Montagne Noire et l'autre du Paléogène des phosphorites du Quercy, a permis de comparer l'évolution des diversités de deux groupes distincts, les conodontes marins et les mammifères terrestres. Les réponses identiques de ces deux groupes face à une crise indiquent qu'il existe un mécanisme commun, quelque soit le groupe systématique,...
Le comportement des phytocénoses continentales lors des couples crises-paléodiversifications est assezdifférent de celui des faunes marines, matériel habituel de l'étude de ces événements. Souvent les périodes de diversifications ne sont pas concomitantes. Une approche globale du Phanérozoïque et surtout, à une toute autre échelle, des études de flores terrestres du Jurassique et du Crétacé inférieur...
Changes in biodiversity of rocky-shore ecosystems from the early Precambrian (3,500 Ma) to the last interglacial epoch (125 Ka) are summarized on the basis of the fossil record associated with geological unconformities that reflect coastal paleotopography. This analysis is derived from data reported in 130 published papers culled and updated from previous bibliographic reviews. Minimum total diversity...
The Palaeozoic history of neoselachian sharks is barely known, and the first unequivocal member ofthis clade is recognized from the Lower Triassic. At the end of the Triassic, neoselachians show a dramatic radiation in Western Europe, where they are represented by seven genera. In the same area, we notice also the appearance of four genera of sharks of uncertain affinities, but showing some convergences...
In the fossil record, distinction between the two basic aspects of evolution, i.e. branching of evolutionarytrees (cladogenesis) and evolutionary transformations along lineages (phyletic evolution, “anagenesis”), is especially well visible. The process of allopatric speciation, presumably the most common, if not the only, way to split a lineage, cannot be recognised directly in any single geological...
From a database of 226 Cambrian - Ordovician genera of organophosphatic-shelled brachiopods comprisingthe Subphylum Linguliformea, 11 sets of morphological characters typify all orders and superfamilies. Seven sets of these large-scale evolutionary novelties were established already by the end of the mid Cambrian, 2 more by the end of the late Cambrian, and the remaining 2 before the end of the Arenig...
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