Annales de Paleontologie最新文献

The Late Miocene of the Siwaliks has yielded fossils of various species of Suidae, which are more or less common. One of the rarest is Lophochoerus nagrii, found exclusively from the Nagri Formation (of early Late Miocene age) of the Siwalik Group. Previously, the only undisputed record of this species was from the Indian Siwaliks, recovered from Haritalyangar, Himachel Pradesh, India. In this article, we describe P3-M3 from the Nagri type locality (Y311) in Talagang, Pakistan; it is the first report of the upper premolars of L. nagrii from the Siwaliks. The discovery of this species from Pakistan confirms extension in its geographic range from India to Pakistan, and the reported upper dentition is an addition in its anatomical record.

In the shallow-marine deposits of the Early Miocene (Aquitanian – Burdigalian) Fırat Formation exposed in the Eğil district of Diyarbakır, SE Turkey, three oyster species such as Ostrea edulis (Linnaeus, 1758), Magallana gryphoides (Schlotheim, 1820), and Hyotissa hyotis (Linnaeus, 1758) were recorded for the first time. The specimens collected include four individuals of O. edulis and three individuals of M. gryphoides from the Sağlam village area, and one individual of H. hyotis from the Sarıca village area in Eğil. These specimens were found in the yellow-limestone facies and beige-white marl facies, which represent the thickest and largest sections of the Fırat Formation. For the Sağlam village area, O. edulis suggests a littoral environment with excessive detrital inputs, ranging from medium to shallow depths, and a warm subtropical climate. The O. edulis display a slender, small, and comparatively regular morphology, suggesting a preference for stable habitats commonly found in coastal regions with minimal environmental variability. Similarly, the presence of the fossil species indicates littoral environments characterized by nearshore shallow depths, low-energy conditions, normal salinity, and warm subtropical climatic conditions for M. gryphoides. For the Sarıca village area, H. hyotis is linked to reef and peri-reef environments, along with shallow tropical-subtropical marine paleoenvironments at depths of up to 50 m. Overall, this study presents novel information about the paleoecological distribution of Early Miocene oysters and their first records in the Eğil district.

The Kopet Dagh sedimentary basin is situated in the northeast of Iran and the south of Turkmenistan. The present work focuses on the systematic representative's species of the Family Phylloceratidae Zittel, 1884, of the Family Gaudryceratidae Spath 1927, of the Family Oppeliidae H. Douvillé, 1890, and of the Family Desmoceratidae Zittel, 1895, all of which are for the first time in the basin. Based on previous studies and assemblage fauna in this study, a late Barremian-early Aptian age is suggested for the measured sequences. The palaeobiogeographical distribution of the ammonites indicates that during the late Barremian to the late Aptian the basin formed part of the Tethyan realm, Mediterranean-Himalayan Province. The studied fauna and other reported ammonites in previous publication might suggest nearshore to offshore an epipelagic to pelagic environment. There is also a relation between the lithology and the morphotype of ammonites.

Pulchelliidae are one of the most important ammonite groups for the Barremian biostratigraphy, and its last species Gerhardtia provincialis was deemed to be an end of lineage with no descendants. However, presence of Pulchelliidae was mentioned several times in levels clearly assigned to the Hemihoplites feraudianus Interval Horizon, while this family was deemed to be extinct in the G. provincialis Subzone; these specimens have never been depicted or described. The description of the both two antidimorphs of Gerhardtia ultima sp. nov., discovered in several sections of southeastern France, fills this gap. In terms of evolution, this ultimate species continues the channeling initiated by Gerhardtia sartousiana and G. provincialis with the setting up of the over deepening of the ventral furrow, which widens in order to occupy its entire width between the peripheral structures in G. ultima sp. nov. In parallel, the peripheral structures are attenuated, the ornamentation disappears on the flanks, and the adult size decreases together with the wide opening of the umbilicus. This hyper-paedomorphic tendency (neoteny and progenesis) occurs suddenly at the end of the lineage, at the same time G. ultima sp. nov. is under dramatic quantitative rarefaction, announcing the complete and definitive disappearance of the Pulchelliidae.

Three Upper Cretaceous sections (Boukaïs sections from the Guir Basin; Gour Louazouaza section from the Tademait Hamada and Gour Belhouillet section from the Tinrhert Hamada) were measured, and their respective echinoid content was studied. Fifteen echinoid species referred to ten genera, are identified and taxonomically described from the upper Cenomanian strata belonging to the Neolobites bioevent. Among the studied echinoids, Pedinopsis (P.) hemisphaerica Abdelhamid, 2014a is recorded for the first time from outside Egypt. The palaeobiogeographic distribution of this fauna is discussed and indicates strong Tethyan affinity.

In this research, benthic foraminifera from the Upper Cretaceous Maastrichtian in the Tutak section (Eastern Iran) was studied for the first time. In the Tutak section, there are outcrops of scattered and lenticular Maastrichtian carbonate sediments between the ophiolitic units. Some of the benthic foraminifera identified in this section are Orbitoides apiculatus, Orbitoides medius, Omphalocyclus cf. macroporus, Orbitoides cf. gruenbachensis, Orbitoides gensacicus, Orbitoides spp., Sirelina orduensis, Canalispina iapygia, Goupillaudina spp., Selimina spinalis, Postomphalocyclus merici. Since there is no comprehensive study of this benthic foraminifera in eastern Iran, the authors suggest the name of the Makhunik unit for these Maastrichtian sediments in the Flysch Basin in the eastern part of Iran.

The Western Saharan Atlas continues to reveal its paleontological secrets. Recent prospecting carried out in the upper part of the Rhoundjaia Formation allows to discover several fossiliferous levels rich in new, unpublished ammonites (lower Turonian). Seven Species are described and illustrated in the context of this study: Neoptychites cephalotus (Courtiller, 1860), Fagesia peroni (Pervinquière, 1907), Fagesia tevesthensis (Peron, 1896), Pseudotissotia nigeriensis (Woods, 1911), Thomasites rollandi (Thomas and Peron, 1889), Choffaticeras (C.) sinaiticum (Douvillé, 1912), Hoplitoides sp. These species cover Watinoceras coloradoense and Mammites nodosoides Zones (lower Turonian) and document a south tethysian paleobiogeographic affinity.

Two evanioid wasps are described from specimens entrapped in Kachin amber. The first species, Sinuevania pouilloni sp. nov., allows a revision of the diagnosis of the genus Sinuevania. The complex forewing venation (plesiomorphy) of this new species confirms that the genus Sinuevania belongs to the stem group of the family Evaniidae. Together with the new praeaulacine wasp Praegastrinus edithae gen. et sp. nov., Sinuevania pouilloni sp. nov. shows that the diversity of the superfamily Evanioidea in the mid-Cretaceous Kachin amber remains underestimated. New fossils of evaniid wasps from the Albo-Cenomanian amber of Charente-Maritime (France) are expected to extend the diversity and distribution of several genera. Based on the recent discovery, but not yet published, of new praeaulacid specimens from the mid-Cretaceous, we propose reclassifying Mesevania within the Praeaulacidae (Praeaulacinae).

Petrified trunks in Mueang Kamphaeng Phet District, upper Central Thailand, were unearthed in Quaternary deposits on the western rim of the Ping River. The sediments consist mainly of semi-consolidated gravel, sand, silt, and clay, indicating that the woods were transported by the ancient Ping River. Macroscopic features revealed that preservation of these fossils (e.g., intercellular spaces, iron oxides, quartz crystals, colors, and weathering conditions) shared many similarities to some petrified trunks in Tak Province. We investigated both large (approx. 0.50–0.7 m wide, at least 10–20 meters long) and small fragments of fossils for both wood anatomical features and mineralogy. Diffuse porosity with indistinct growth rings and wide vessels at low densities suggest a tropical lowland forest paleoenvironment. Parenchyma patterns are aliform to confluent, banded, and diffuse-in aggregate. At least four distinct types of wood were recognized from this site. Among them, three wood types originate from legume trees (Fabaceae), while the fourth is from a eudicotyledonous tree. Two of the three legumes show closest resemblance to a tall (canopy emergent) legume tree, Koompassia cf. malaccensis Maingay ex Benth. and one resembles the legume Koompassia cf. malaccensis or cf. Pahudioxylon bankurensis Chowdhury, Ghosh, et Kazmi. The other legume-like wood shows banded parenchyma. Petrified wood from Kamphaeng Phet is correlative with other Quaternary paleofloras found in Northern Thailand in both preservation and taxa. The past climate, as inferred according to the Köppen-Geiger classification, was possibly similar to modern-day tropical rainforests (Af) in southern Thailand, Malaysia, and Indonesia in contrast to the modern vegetation in Mueang District, Kamphaeng Phet that is a mixed deciduous and dry dipterocarp forest where the modern climate in the area is tropical wet and dry (Aw).

A new Mesozoic fossiliferous locality was discovered in the Mae Sot Basin, western Thailand. Ginglymodian fish scales and bones are reported, as well as wood (Brachyoxylon sp.) and leafy twigs (cf. Cupressinocladus sp.). These are associated with Skolithosand Scoyeniaichnofacies. The biotic remains were deposited in an anoxic fluvial environment and wood underwent humification. Fossil wood specimens show a wide range of composition, ranging from nearly pure carbon to mixtures of coal and siliceous sediment. The limited fossil record makes biogeographical comparisons and stratigraphic deductions difficult. It is however the first time that terrestrial Mesozoic biota is reported from the Shan-Thai terrane west of the Chiang Mai suture and north of the Three Pagoda fault. Further research in and around this locality may refine our still fragmentary knowledge of Mesozoic continental ecosystems west of the Nan-Uttaradit suture.