The ultimate Pulchelliidae (Ammonoidea, upper Barremian)

IF 1 4区 地球科学 Q4 PALEONTOLOGY Annales de Paleontologie Pub Date : 2024-04-01 DOI:10.1016/j.annpal.2024.102663
Didier Bert , Stéphane Bersac
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Abstract

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.

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终极普尔切尔科(Amonoidea,上巴利米亚统)
Pulchelliidae 是巴里米亚生物地层中最重要的鹦鹉螺类群之一,其最后一个物种 Gerhardtia provincialis 被认为是一个没有后代的末代。然而,在明显属于 Hemihoplites feraudianus 区间地层的层位中多次提到 Pulchelliidae 的存在,而该科在 G. provincialis 亚区被认为已经灭绝;这些标本从未被描绘或描述过。对在法国东南部多个地段发现的 Gerhardtia ultima sp.在进化过程中,该终极物种延续了 Gerhardtia sartousiana 和 G. provincialis 的进化过程,腹沟过度加深,在新种 Gerhardtia ultima 中,腹沟变宽,占据了外围结构之间的整个宽度。这种超多态性趋势(新生和原生)突然发生在该品系的末期,与此同时,G. ultima sp.
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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.
期刊最新文献
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