A palaeobiological revision of the species Ammonites flexisulcatus d’Orbigny, 1840 (Ammonoidea) from the upper Aptian of southern France

IF 1 4区 地球科学 Q4 PALEONTOLOGY
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Abstract

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.

法国南部上奥普泰期Ammonites flexisulcatus d'Orbigny, 1840(Ammonoidea)物种的古生物学修正
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。
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来源期刊
Annales de Paleontologie
Annales de Paleontologie 地学-古生物学
CiteScore
1.70
自引率
10.00%
发文量
8
审稿时长
>12 weeks
期刊介绍: Créées par Marcellin Boule en 1905, les Annales de Paléontologie publient 4 numéros par an traitant des fossiles animaux et végétaux, dans tous les domaines de la paléontologie incluant : -La Paléoanatomie- La Paléohistologie- La Morphologie fonctionnelle- La Systématique- L''Évolution- La Paléoécologie ... et toute les contributions susceptibles d''améliorer la compréhension des organismes et des environnements éteints.
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