This dataset contains the digitized treatments in Plazi based on the original journal article Weis, Robert, Mariotti, Nino, Pignatti, Johannes, Delsate, Dominique (2025): Lotharingibelus n. gen., a new belemnite genus from the upper Toarcian Minette ironstones of the NE Paris Basin. Geodiversitas 47 (23): 767-781, DOI: 10.5252/geodiversitas2025v47a23
ABSTRACT
Jurassic belemnites have been widely studied by pioneering paleontologists in the early to late 19th century; it is therefore not surprising that most taxa still valid today were originally erected during that century. However, the standards for description and figuration having considerably evolved since then, many “historical” taxa have been repeatedly the subject of diverging taxonomic interpretation. It is therefore of great importance to revise these taxa and provide more detailed descriptions and illustrations of the type material. Herein, we restudy abundant material of Belemnites meta Blainville, 1827 and Belemnites subgiganteus Branco, 1879, two characteristic belemnite taxa of the Minette-type ironstones of Lorraine (France, Region Grand-Est, departments Moselle and Meurthe-et-Moselle), southern Luxembourg and Gaume (Southeast Belgium). Over the years, the taxonomic interpretation and species boundaries of these two taxa have remained unclear, with diverging opinions. We therefore maintain that for the purposes of a precise application of these nominal species and to clarify their stratigraphic position, systematic characters, and phylogenetic relationship, a typification is necessary. Herein, we designate a neotype for B. subgiganteus, illustrate the types of both species, and provide details about their type localities and stratigraphic occurrence. Their peculiar morphological characters also lead us to introduce a new genus, Lotharingibelus n. gen., with Belemnites meta Blainville as a type species. Lotharingibelus n. gen. is a megateuthidid with a relatively short stratigraphical range (upper Toarcian) that had its dispersal center in the north-eastern Paris Basin. The occurrence of specimens with or without an epirostrum allows us to discuss aspects of their ontogeny and the long-debated issue of a possible sexual dimorphism in belemnites.
MOTS CLÉS Systématique, Belemnitida, Céphalopodes, Jurassique, néotypification, genre nouveau, combinaisons nouvelles RÉSUMÉ
Lotharingibelus n. gen., un nouveau genre de bélemnites du minerai de fer de la Minette du Toarcien supérieur du NE du bassin parisien.
Les bélemnites du Jurassique ont été abondamment étudiées par les paléontologues pionniers du début à la fin du 19 e siècle; il n’est donc pas surprenant que la plupart des taxons encore valides aujourd’hui aient été érigés à l’origine au cours de ce siècle. Cependant, les standards de description et de figuration ayant considérablement évolué depuis lors, de nombreux taxons « historiques » ont fait l’objet d’interprétations taxonomiques divergentes au fil du temps. Il est donc d’une grande importance de réviser ces taxons et de fournir des descriptions et des illustrations plus détaillées du matériel type. Nous avons ici réétudié de nombreux spécimens de Belemnites meta Blainville, 1827 et Belemnites subgiganteus Branco, 1879, deux taxons caractéristiques parmi les bélemnites présentes dans les roches du type Minette en Lorraine (France, région Grand-Est, départements de la Moselle et de la Meurthe-et-Moselle), dans le sud du Luxembourg et en Gaume (sud-est de la Belgique). Au fil des ans, l’interprétation taxonomique et les délimitations de ces deux taxons sont restées floues, suscitant des opinions divergentes. Nous soutenons donc qu’une caractérisation est nécessaire pour une identification précise de ces espèces nominales et pour clarifier leur position stratigraphique, leurs caractères systématiques et leur relation phylogénétique. Nous désignons ici un néotype pour B. subgiganteus, illustrons les types des deux espèces et fournissons des détails sur leurs localités types et leur occurrence stratigraphique. Leurs caractères morphologiques particuliers nous ont également amenés à introduire un nouveau genre, Lotharingibelus n. gen., avec Belemnites meta Blainville, 1827 comme espèce type. Lotharingibelus n. gen. est un mégatéuthididé dont l’intervalle stratigraphique est relativement restreint (Toarcien supérieur) et dont le centre de dispersion se situait dans le nord-est du bassin parisien. La présence de spécimens avec ou sans épirostre nous permet d’aborder certains aspects de leur ontogénie et la question, longtemps débattue, d’un éventuel dimorphisme sexuel chez les bélemnites
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