Morphological diversification of ampullariid gastropods (Nsungwe Formation, Late Oligocene, Rukwa Rift Basin, Tanzania) is coincident with onset of East African rifting

Morphological diversification of ampullariid gastropods (Nsungwe Formation, Late Oligocene, Rukwa Rift Basin, Tanzania) is coincident with onset of East African rifting
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ampullariid 腹足类动物(坦桑尼亚鲁夸裂谷盆地晚渐新世 Nsungwe 组)的形态多样化与东非裂谷的爆发同时发生

DOI:
10.1002/spp2.1108
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发表时间:
2018
影响因子:
2.3
通讯作者:
Hautmann, ed., Michael
Hautmann, ed., Michael
中科院分区:
地球科学2区
文献类型:
--
作者:
Epa, Y. Ranjeev;Stigall, Alycia L.;Roberts, Eric M.;O'Brien, Haley D.;Stevens, Nancy J.;Hautmann, ed., Michael

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坦桑尼亚鲁夸裂谷盆地渐新世晚期 Nsungwe 地层描述了一种新的淡水腹足动物群。建立了 6 个壶腹类新种,其中包括 5 个 Lanistes 种(L. microovum、L. nsungwensis、L. rukwaensis、L. Songwellipticus 和 L. Songweovum)和 1 个 Carnevalea 种(C. santiapillaii)。这些类群占据的形态空间区域相当于现存兰尼斯特属的近一半,兰尼斯特属是非洲和马达加斯加常见且分布广泛的属。古生态学证据表明,Nsungwe ampullariids 栖息于河流、池塘和沼泽环境中。在这些物种中,有最古老的高螺旋和河流适应的兰尼斯特塔克斯亚(Lanistestaxa)。我们认为,NsungweLanistes 的迅速多样化与栖息地异质性相一致,而栖息地异质性与东非裂谷系统 (EARS) 西部分支裂谷的开始有关。 Nsungwe 组淡水腹足动物的分类学、进化和生物地理亲缘关系对于扩大非洲大陆采样不足的古近纪无脊椎动物化石记录做出了重大贡献。
A new freshwater gastropod fauna is described from the late Oligocene Nsungwe Formation of the Rukwa Rift Basin, Tanzania. Six new species of ampullariids are established including five species ofLanistes(L. microovum,L. nsungwensis,L. rukwaensis,L. songwellipticusandL. songweovum) and one species ofCarnevalea(C. santiapillaii). These taxa occupy a morphospace region comparable to nearly half of extantLanistes, a common and widespread genus in Africa and Madagascar. Palaeoecological evidence indicates that Nsungwe ampullariids inhabited fluvial, pond and paludal environments. Among these species are the oldest high‐spired and fluvially adapatedLanistestaxa. We suggest that NsungweLanistesrapidly diversified in concert with habitat heterogeneity associated with the initiation of rifting along the western branch of the East African Rift System (EARS). Taxonomy, evolution and the biogeographical affinities of Nsungwe Formation freshwater gastropods contributes significantly to expanding the undersampled Palaeogene invertebrate fossil record of continental Africa.
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