Pub Date : 2025-01-01DOI: 10.1016/j.annpal.2024.102753
Didier Neraudeau , Roch-Alexandre Benoit
Outcrops of fossiliferous Palaeogene deposits are identified for the first time in the northern part of the Aquitaine Basin, at Saint-Jean-d’Angle, locality of Malaigre, in the Rochefort area (Charente-Maritime). They provide silicified deposits of a millstone facies, with a fossiliferous content rich in charophyte remains (gyrogonites, stems, “roots”) and in freshwater gastropods (hydrobioids, limnaeids). A preliminary study of the charophytes allowed to observe in the more or less translucent siliceous matrix gyrononites close to the genera Lychnothamnus, Sphaerochara and Harrisichara. On the palaeogeographical and palaeoenvironmental points of view, these silicified facies give evidence of the marine regression started during the late Eocene that lead to the continentalisation of the northern Aquitaine and the regional development of lacustrine areas.
{"title":"Mise en évidence d’une formation siliceuse oligocène de type meulière dans le nord du bassin d’Aquitaine (Saint-Jean-d’Angle, Charente-Maritime, SO France)","authors":"Didier Neraudeau , Roch-Alexandre Benoit","doi":"10.1016/j.annpal.2024.102753","DOIUrl":"10.1016/j.annpal.2024.102753","url":null,"abstract":"<div><div>Outcrops of fossiliferous Palaeogene deposits are identified for the first time in the northern part of the Aquitaine Basin, at Saint-Jean-d’Angle, locality of Malaigre, in the Rochefort area (Charente-Maritime). They provide silicified deposits of a millstone facies, with a fossiliferous content rich in charophyte remains (gyrogonites, stems, “roots”) and in freshwater gastropods (hydrobioids, limnaeids). A preliminary study of the charophytes allowed to observe in the more or less translucent siliceous matrix gyrononites close to the genera <em>Lychnothamnus</em>, <em>Sphaerochara</em> and <em>Harrisichara</em>. On the palaeogeographical and palaeoenvironmental points of view, these silicified facies give evidence of the marine regression started during the late Eocene that lead to the continentalisation of the northern Aquitaine and the regional development of lacustrine areas.</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"111 1","pages":"Article 102753"},"PeriodicalIF":1.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.annpal.2024.102752
Madani Benyoucef , Bernard Landau
Palaeontological investigation of the Pliocene Tahria and Slama formations in the Lower Chelif Basin (NW Algeria) led us to collect significant gastropod assemblages for taxonomic and taphonomic purposes. There is presently a very complete inventory list of Pliocene gastropods from Algeria, with 16 species from the Zanclean Tahria Formation and 54 species from the Piacenzian Slama Formation, some of which are recorded for the first time from the Pliocene of the Mediterranean. The northwestern Algeria gastropods represent a shallow-water, fully marine fauna, sandy substrate, and show a typical Upper Pliocene Mediterranean assemblage. The gastropod shells show significant taphonomic alteration; most specimens are abraded and decalcified to a variable degree. Fragmentation was mainly a result of mechanical and biological processes. Bioerosion traces are uncommon, but when they are present, they are predominantly those of predatory gastropods (Oichnus simplex and Oichnus paraboloides), polychaete activity (Maeandropolydora isp.), and acrothoracican barnacle borings (Rogerella isp.). Integration of taphonomical, palaeoecological, and sedimentological characteristics of the gastropod-bearing beds suggests sedimentological concentrations originated from discontinuous processes of winnowing and bypassing sediments, most likely due to storm action in the shoreface depositional environment.
{"title":"Systematics and taphonomy of Pliocene Gastropoda (Mollusca) from the Dahra Mountains, NW Algeria","authors":"Madani Benyoucef , Bernard Landau","doi":"10.1016/j.annpal.2024.102752","DOIUrl":"10.1016/j.annpal.2024.102752","url":null,"abstract":"<div><div>Palaeontological investigation of the Pliocene Tahria and Slama formations in the Lower Chelif Basin (NW Algeria) led us to collect significant gastropod assemblages for taxonomic and taphonomic purposes. There is presently a very complete inventory list of Pliocene gastropods from Algeria, with 16 species from the Zanclean Tahria Formation and 54 species from the Piacenzian Slama Formation, some of which are recorded for the first time from the Pliocene of the Mediterranean. The northwestern Algeria gastropods represent a shallow-water, fully marine fauna, sandy substrate, and show a typical Upper Pliocene Mediterranean assemblage. The gastropod shells show significant taphonomic alteration; most specimens are abraded and decalcified to a variable degree. Fragmentation was mainly a result of mechanical and biological processes. Bioerosion traces are uncommon, but when they are present, they are predominantly those of predatory gastropods (<em>Oichnus simplex</em> and <em>Oichnus paraboloides</em>), polychaete activity (<em>Maeandropolydora</em> isp.), and acrothoracican barnacle borings (<em>Rogerella</em> isp.). Integration of taphonomical, palaeoecological, and sedimentological characteristics of the gastropod-bearing beds suggests sedimentological concentrations originated from discontinuous processes of winnowing and bypassing sediments, most likely due to storm action in the shoreface depositional environment.</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"111 1","pages":"Article 102752"},"PeriodicalIF":1.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.annpal.2024.102749
Garry Singla , Birendra P. Singh , Om Narain Bhargava , Ramanpreet Kaur , Vishal Verma
We precisely demarcate the Oryctocephalus salteri biozone in the Cambrian Parahio Member (Kunzam La Formation) well exposed on the southwest-facing slope above the right bank of the Sumna River, Spiti. The FAD and LAD of O. salteri are located at 46.5 m and 60.8 m respectively, indicating a 14.3 m local stratigraphic range of the taxon along the section in Sumna Valley, Spiti. The O. salteri biozone is demarcated with a precise stratigraphic range of the eponymous species. This biozone contains trilobites O. salteri, Kunmingaspis stracheyi, Poriagraulos sp., Ziboaspis hostilis, Hundwarella memor, and Xingrenaspis hoboi. Based on the presence of the key taxon Hundwarella, the O. salteri biozone of the Kunzam La Formation (Spiti) is correlated with the Tonkinella-Hundwarella bearing level in the Nutunus Formation, Kashmir region.
{"title":"Oryctocephalus salteri biozone (Wuliuan, Miaolingian) in the Sumna Valley, Spiti, Himalaya","authors":"Garry Singla , Birendra P. Singh , Om Narain Bhargava , Ramanpreet Kaur , Vishal Verma","doi":"10.1016/j.annpal.2024.102749","DOIUrl":"10.1016/j.annpal.2024.102749","url":null,"abstract":"<div><div>We precisely demarcate the <em>Oryctocephalus salteri</em> biozone in the Cambrian Parahio Member (Kunzam La Formation) well exposed on the southwest-facing slope above the right bank of the Sumna River, Spiti. The FAD and LAD of <em>O. salteri</em> are located at 46.5<!--> <!-->m and 60.8<!--> <!-->m respectively, indicating a 14.3<!--> <!-->m local stratigraphic range of the taxon along the section in Sumna Valley, Spiti. The <em>O. salteri</em> biozone is demarcated with a precise stratigraphic range of the eponymous species. This biozone contains trilobites <em>O. salteri</em>, <em>Kunmingaspis stracheyi</em>, <em>Poriagraulos</em> sp., <em>Ziboaspis hostilis</em>, <em>Hundwarella memor</em>, and <em>Xingrenaspis hoboi.</em> Based on the presence of the key taxon <em>Hundwarella,</em> the <em>O. salteri</em> biozone of the Kunzam La Formation (Spiti) is correlated with the <em>Tonkinella-Hundwarella</em> bearing level in the Nutunus Formation, Kashmir region.</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"111 1","pages":"Article 102749"},"PeriodicalIF":1.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.annpal.2024.102750
Danièle Gaspard, Florent Goussard
With the purpose to reveal the Campanian heritage in the stratotype region, we took the opportunity to highlight, among the diverse fauna, the brachiopods: benthic marine invertebrates reported since the 19th century but never really detailed till now. The phylum Brachiopoda, present since the Cambrian, decreased in number of orders after the Permian-Triassic crisis with a replacement of taxa and another crisis after the Jurassic, but representatives are still present during the Cretaceous, even the Campanian till now. The limits of this stage were explicit since the mid 19th century for the basal part with the first occurrence of Rhynchonella globata, and the reports of several authors during the 20th century for the upper boundary. Noteworthy species (one Craniiformea and nearly twenty Rhynchonelliformea) are studied and positioned in a context with lithostratigraphic units, biozones, and six formations (Fm) named after different drillings. Using tomography to reveal the brachidium of some species was highly helpful. The environments in which lived the brachiopod species, from the lower to the upper Campanian, are evoked.
{"title":"Brachiopod biodiversity and characteristics from the Campanian Stratotype region (Les Charentes and Dordogne, France)","authors":"Danièle Gaspard, Florent Goussard","doi":"10.1016/j.annpal.2024.102750","DOIUrl":"10.1016/j.annpal.2024.102750","url":null,"abstract":"<div><div>With the purpose to reveal the Campanian heritage in the stratotype region, we took the opportunity to highlight, among the diverse fauna, the brachiopods: benthic marine invertebrates reported since the 19th century but never really detailed till now. The phylum Brachiopoda, present since the Cambrian, decreased in number of orders after the Permian-Triassic crisis with a replacement of taxa and another crisis after the Jurassic, but representatives are still present during the Cretaceous, even the Campanian till now. The limits of this stage were explicit since the mid 19th century for the basal part with the first occurrence of <em>Rhynchonella globata</em>, and the reports of several authors during the 20th century for the upper boundary. Noteworthy species (one Craniiformea and nearly twenty Rhynchonelliformea) are studied and positioned in a context with lithostratigraphic units, biozones, and six formations (Fm) named after different drillings. Using tomography to reveal the brachidium of some species was highly helpful. The environments in which lived the brachiopod species, from the lower to the upper Campanian, are evoked.</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"111 1","pages":"Article 102750"},"PeriodicalIF":1.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.annpal.2024.102738
Guillaume Guinot , Romain Vullo , Karin Peyer , Vincent Reneleau
We report and describe the only articulated shark specimen collected from the Tithonian Canjuers Lagerstätte (Var, southeastern France). This specimen displays several anatomical and morphological features that support its attribution to the monotypic genus Palaeocarcharias. The specimen is furthermore confidently assigned to the species P. stromeri, whose articulated skeletal remains have been reported from coeval deposits in the Eichstätt area (Bavaria, southern Germany). The systematic position of this genus has been debated since its first description and remains controversial with recent works placing it as a basal lamniform or sister to the Lamniformes-Carcharhiniformes clade. The nearly complete specimen from Canjuers provides new anatomical information that complements previous descriptions based on the German material. Taken together, the morpho-anatomical features observed in Palaeocarcharias indicate that this genus is related to woobegong sharks (Orectolobiformes: Orectolobidae).
{"title":"An articulated skeleton of the neoselachian shark Palaeocarcharias from the Late Jurassic Canjuers Lagerstätte (southeastern France)","authors":"Guillaume Guinot , Romain Vullo , Karin Peyer , Vincent Reneleau","doi":"10.1016/j.annpal.2024.102738","DOIUrl":"10.1016/j.annpal.2024.102738","url":null,"abstract":"<div><div>We report and describe the only articulated shark specimen collected from the Tithonian Canjuers Lagerstätte (Var, southeastern France). This specimen displays several anatomical and morphological features that support its attribution to the monotypic genus <em>Palaeocarcharias</em>. The specimen is furthermore confidently assigned to the species <em>P. stromeri</em>, whose articulated skeletal remains have been reported from coeval deposits in the Eichstätt area (Bavaria, southern Germany). The systematic position of this genus has been debated since its first description and remains controversial with recent works placing it as a basal lamniform or sister to the Lamniformes-Carcharhiniformes clade. The nearly complete specimen from Canjuers provides new anatomical information that complements previous descriptions based on the German material. Taken together, the morpho-anatomical features observed in <em>Palaeocarcharias</em> indicate that this genus is related to woobegong sharks (Orectolobiformes: Orectolobidae).</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"111 1","pages":"Article 102738"},"PeriodicalIF":1.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.annpal.2024.102736
Olev Vinn , İzzet Hosgör , Abdullah A. Alkahtane , Magdy El Hedeny , Saleh Al Farraj
The first serpulid has been found in the Cretaceous of Türkiye and identified as Parsimonia antiquata. This is the first record of Parsimonia from the Cretaceous of the Middle East. The discovered specimen is not located on the exterior of ammonite shell, but in the interior, suggesting a post mortem nature of this serpulid-ammonite association. The tropical Tethys was rich in various shelly invertebrates and presumably had favorable conditions for serpulid worms. The lack of previous records of serpulids from the Cretaceous of Türkiye can be explained by a collecting bias. The find of Parsimonia in the Maastrichtian Beyobası Formation in the Haymana-Polatlı basin, central Türkiye, represents the warmest water record of the genus in the Cretaceous, and demonstrates that the genus had a wider geographic and climatic distribution than previously known.
{"title":"First record of serpulids from the Cretaceous (Maastrichtian) of Türkiye","authors":"Olev Vinn , İzzet Hosgör , Abdullah A. Alkahtane , Magdy El Hedeny , Saleh Al Farraj","doi":"10.1016/j.annpal.2024.102736","DOIUrl":"10.1016/j.annpal.2024.102736","url":null,"abstract":"<div><div>The first serpulid has been found in the Cretaceous of Türkiye and identified as <em>Parsimonia antiquata</em>. This is the first record of <em>Parsimonia</em> from the Cretaceous of the Middle East. The discovered specimen is not located on the exterior of ammonite shell, but in the interior, suggesting a <em>post mortem</em> nature of this serpulid-ammonite association. The tropical Tethys was rich in various shelly invertebrates and presumably had favorable conditions for serpulid worms. The lack of previous records of serpulids from the Cretaceous of Türkiye can be explained by a collecting bias. The find of <em>Parsimonia</em> in the Maastrichtian Beyobası Formation in the Haymana-Polatlı basin, central Türkiye, represents the warmest water record of the genus in the Cretaceous, and demonstrates that the genus had a wider geographic and climatic distribution than previously known.</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"110 4","pages":"Article 102736"},"PeriodicalIF":1.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.annpal.2024.102735
Cyril Baudouin , Gérard Delanoy
The nautiloid genus PseudaturoideaShimansky, 1975 (type species Nautilus forbesianusBlanford, 1861) is recorded from south-eastern France, and the species Pseudaturoidea vermeuleni sp. nov., occurring in the upper Barremian and lower Aptian of south-eastern France, is erected. The systematic position of the genus PseudaturoideaShimansky is revised.
{"title":"A new species of the genus Pseudaturoidea Shimansky, 1975 (Pseudonautilidae, Nautiloidea) from the Lower Cretaceous of south-eastern France","authors":"Cyril Baudouin , Gérard Delanoy","doi":"10.1016/j.annpal.2024.102735","DOIUrl":"10.1016/j.annpal.2024.102735","url":null,"abstract":"<div><div>The nautiloid genus <em>Pseudaturoidea</em> <span>Shimansky</span>, 1975 (type species <em>Nautilus forbesianus</em> <span>Blanford</span>, 1861) is recorded from south-eastern France, and the species <em>Pseudaturoidea vermeuleni</em> sp. nov., occurring in the upper Barremian and lower Aptian of south-eastern France, is erected. The systematic position of the genus <em>Pseudaturoidea</em> <span>Shimansky</span> is revised.</div></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"110 4","pages":"Article 102735"},"PeriodicalIF":1.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.annpal.2024.102724
Free Espinosa , Carlos Navarro-Barranco , Maite Vázquez-Luis , Darren Fa
Human harvesting has been considered as the main cause of depletion and even extinction for many littoral species in the Mediterranean through the Pleistocene to Holocene. One of the most endangered marine species nowadays in this area is the Mediterranean Ribbed Limpet (Patella ferruginea), whose reduction in its distributional area and population number has been traditionally associated with human pressure. However, according to the fossil records and the information available, it seems that the environmental factors could be responsible for its extirpation of some areas in the Mediterranean during the Quaternary such as the Balearic archipelago.
{"title":"Extirpation of the currently endangered mollusc Patella ferruginea through the Mediterranean during the Pleistocene: A matter of human harvesting or environmental factors?","authors":"Free Espinosa , Carlos Navarro-Barranco , Maite Vázquez-Luis , Darren Fa","doi":"10.1016/j.annpal.2024.102724","DOIUrl":"10.1016/j.annpal.2024.102724","url":null,"abstract":"<div><p>Human harvesting has been considered as the main cause of depletion and even extinction for many littoral species in the Mediterranean through the Pleistocene to Holocene. One of the most endangered marine species nowadays in this area is the Mediterranean Ribbed Limpet (<em>Patella ferruginea</em>), whose reduction in its distributional area and population number has been traditionally associated with human pressure. However, according to the fossil records and the information available, it seems that the environmental factors could be responsible for its extirpation of some areas in the Mediterranean during the Quaternary such as the Balearic archipelago.</p></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"110 4","pages":"Article 102724"},"PeriodicalIF":1.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-13DOI: 10.1016/j.annpal.2024.102708
Camille Frau , Luc G. Bulot , Josep A. Moreno-Bedmar , Rafel Matamales-Andreu , Émile Hourqueig
The Lower Cretaceous ammonite species Ammonites flexisulcatus d’Orbigny is revised on the basis of seventy-five topotype specimens, including the newly designated neotype, from the Cassis–Roquefort-la-Bédoule area, southern France. Because of its suture line and juvenile shell morphology, Ammonites flexisulcatus belongs to the family Desmoceratidae, and is herein assigned to the upper Aptian genus Caseyella Cantú-Chapa. Our palaeobiological study documents a morpho-dimensional dimorphism based on small-sized, robust, ribbed microconchs with a short ventral rostrum, and large, high-whorled macroconchs with a simple aperture. This species occurs in the upper part of the Epicheloniceras martini standard ammonite zone in both the South Provence and Vocontian Basin of southeastern France. Another morphotype of Caseyella, which occurs in the lower part of the Epicheloniceras martini Zone of southern France and Spain, differs by a flattened ventral region in the juveniles; pending examination, they could belong to a new species or consist of an ecological variant of Caseyella flexisulcata. These stratigraphic occurrences subscribe to previous observations suggesting that the Mediterranean Caseyella are younger than the species group of Caseyella reesidei dating the basal upper Aptian in Mexico.
根据来自法国南部卡西斯-罗克福尔-拉贝杜尔地区的 75 个原型标本（包括新指定的新原型），对下白垩世的氨石种 Ammonites flexisulcatus d'Orbigny 进行了修订。由于其缝合线和幼壳形态，Amonites flexisulcatus属于Desmoceratidae科，在此被归入上新世的Caseyella Cantú-Chapa属。我们的古生物学研究记录了一种形态维度的二态性，其基础是具有短腹部喙的小尺寸、粗壮、带肋的小海螺和具有简单孔径的大尺寸、高角的大海螺。该物种出现在法国东南部南普罗旺斯和沃孔盆地的 Epicheloniceras martini 标准氨石区上部。Caseyella 的另一个形态型出现在法国南部和西班牙的 Epicheloniceras martini 区的下部，其不同之处在于幼体的腹部区域扁平；有待检查，它们可能属于一个新物种，也可能是 Caseyella flexisulcata 的生态变体。这些地层现象证实了之前的观察结果，即地中海Caseyella比可追溯到墨西哥基底上新世的Caseyella reesidei物种群更年轻。
{"title":"A palaeobiological revision of the species Ammonites flexisulcatus d’Orbigny, 1840 (Ammonoidea) from the upper Aptian of southern France","authors":"Camille Frau , Luc G. Bulot , Josep A. Moreno-Bedmar , Rafel Matamales-Andreu , Émile Hourqueig","doi":"10.1016/j.annpal.2024.102708","DOIUrl":"10.1016/j.annpal.2024.102708","url":null,"abstract":"<div><p>The Lower Cretaceous ammonite species <em>Ammonites flexisulcatus</em> d’Orbigny is revised on the basis of seventy-five topotype specimens, including the newly designated neotype, from the Cassis–Roquefort-la-Bédoule area, southern France. Because of its suture line and juvenile shell morphology, <em>Ammonites flexisulcatus</em> belongs to the family Desmoceratidae, and is herein assigned to the upper Aptian genus <em>Caseyella</em> Cantú-Chapa. Our palaeobiological study documents a morpho-dimensional dimorphism based on small-sized, robust, ribbed microconchs with a short ventral rostrum, and large, high-whorled macroconchs with a simple aperture. This species occurs in the upper part of the <em>Epicheloniceras martini</em> standard ammonite zone in both the South Provence and Vocontian Basin of southeastern France. Another morphotype of <em>Caseyella</em>, which occurs in the lower part of the <em>Epicheloniceras martini</em> Zone of southern France and Spain, differs by a flattened ventral region in the juveniles; pending examination, they could belong to a new species or consist of an ecological variant of <em>Caseyella flexisulcata</em>. These stratigraphic occurrences subscribe to previous observations suggesting that the Mediterranean <em>Caseyella</em> are younger than the species group of <em>Caseyella reesidei</em> dating the basal upper Aptian in Mexico.</p></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"110 4","pages":"Article 102708"},"PeriodicalIF":1.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The bivalve fauna of the Upper Jurassic (Kimmeridgian) successions belonging to the Daïa and Nador mountains (NW Algeria) is taxonomically described and figured. For the first time, sixteen bivalve taxa were identified, partly in open nomenclature because of their poor state of preservation. Most taxa are represented by internal casts. The fauna was collected from two different formations of the same age: the Dolomies de Tlemcen Formation in the Daïa Mountains and the Faïdja Formation in the Nador Mountains. The lithologic characteristics of these formations, together with their fossil content and taphonomic features, confirm that these localities are characterized by marine conditions. The north-western Algerian bivalve assemblage holds the largest portion of cosmopolitan species.
{"title":"Late Jurassic (Kimmeridgian) bivalves from northwestern Algeria (Daïa and Nador mountains): Systematics and palaeobiogeography","authors":"Kamila Frioui , Asma Fethia Ghenim , Madani Benyoucef , Imad Bouchemla , Mustapha Bensalah","doi":"10.1016/j.annpal.2024.102723","DOIUrl":"10.1016/j.annpal.2024.102723","url":null,"abstract":"<div><p>The bivalve fauna of the Upper Jurassic (Kimmeridgian) successions belonging to the Daïa and Nador mountains (NW Algeria) is taxonomically described and figured. For the first time, sixteen bivalve taxa were identified, partly in open nomenclature because of their poor state of preservation. Most taxa are represented by internal casts. The fauna was collected from two different formations of the same age: the Dolomies de Tlemcen Formation in the Daïa Mountains and the Faïdja Formation in the Nador Mountains. The lithologic characteristics of these formations, together with their fossil content and taphonomic features, confirm that these localities are characterized by marine conditions. The north-western Algerian bivalve assemblage holds the largest portion of cosmopolitan species.</p></div>","PeriodicalId":50780,"journal":{"name":"Annales de Paleontologie","volume":"110 4","pages":"Article 102723"},"PeriodicalIF":1.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142172995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号