A revision of the lower cretaceous heteromorphic ammonite species Anisoceras carcitanense Matheron, 1880 and the introduction of Hourqueigella gen. nov.

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research Pub Date : 2026-05-01 Epub Date: 2025-11-20 DOI:10.1016/j.cretres.2025.106266

Camille Frau

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Abstract

The revision of the heteromorph ammonite Anisoceras carcitanense Matheron, 1880, supports the establishment of the new genus Hourqueigella gen. nov. Its suture line, characterized by a very deep, symmetrically trifid adventive lobe and a broad, bipartite lateral saddle, together with medium-sized hamulicone coiling featuring an extended retroversum and simple ribbing, indicates close affinities with certain members of the family Acrioceratidae Vermeulen, particularly the atuberculate pole of Toxoceratoides, previously assigned to the Tonohamites–Raymondcaseyites plexus. The combination of exceptionally large size, hamulicone coiling, and hypermorphic retroversum in Hourqueigella, however, demonstrates a clear generic distinction from these atuberculate Toxoceratoides. Examination of new topotype specimens from Cassis–Roquefort-La-Bédoule, southern France, confirms the presence of this species in the lower upper Aptian (lower Epicheloniceras martini Zone).

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下白垩统异形菊石Anisoceras carcitanense Matheron， 1880的修订及Hourqueigella gen. nov的介绍。

异形菊石Anisoceras carcitanense Matheron（1880）的修正支持了Hourqueigella gen. 11新属的建立，其缝合线的特征是非常深的对称的三裂外生裂片和宽的两裂侧鞍，以及中等大小的环形盘曲，具有延伸的后背和简单的肋，表明与Vermeulen family的某些成员有密切的关系。特别是弓形虫的管状极，以前属于托诺哈米特-雷蒙德卡塞基神经丛。然而，在Hourqueigella中，异常大的体型、假体盘绕和超形态的后足的组合表明了与这些疣状弓形虫的明显的一般区别。对来自法国南部cassis - roquefort - la - b doule的新形态标本的检查证实，该物种存在于阿普tian的下上部（下Epicheloniceras martini区）。

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来源期刊

Cretaceous Research 地学-地质学

CiteScore

4.10

自引率

19.00%

发文量

235

审稿时长

12 weeks

期刊介绍： Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.