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首页> 外文期刊>Rivista Italiana di Paleontologia e Stratigrafia >BIOEROSION SCARS OF ACORN BARNACLES FROM THE SOUTHWESTERN IBERIAN PENINSULA, UPPER NEOGENE
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BIOEROSION SCARS OF ACORN BARNACLES FROM THE SOUTHWESTERN IBERIAN PENINSULA, UPPER NEOGENE

机译:上新生代西南伊比利亚半岛的甲壳虫生物侵蚀标本

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摘要

New etching trace fossils produced by the attachment of balanid barnacles on fossil molluscs, mainly bivalves, from the Upper Miocene of Cacela (southern Portugal) and Lower Pliocene of Huelva (southwestern Spain) are described. These traces are named as Anellusichnus igen. n. due to the ring-like shape of the scars. Two ichnospecies are recognized: A. circularis n. isp., consisting in a circular scar defined by a discoloured area or by a circular to subcircular trench and A. undulatus n. isp. that has a sinuous perimeter reflecting the undulate pathway of the furrow and a flat shelf etched into the substrate. Within the outer furrow both can display a cluster of circular, oval or subpolygonal concentric lines. A. undulatus n. isp. shows several morphologies that correspond to different ontogenetic stages.
机译:描述了新的蚀刻痕迹化石,这些化石是通过将藤蔓藤壶附着在化石软体动物(主要是双壳类)上而产生的,这些化石来自卡塞拉的上中新世(葡萄牙南部)和韦尔瓦的下新世(西南西班牙)。这些痕迹被命名为Anellusichnus igen。 。由于疤痕呈环状。认识到两种鱼科物种:A. circleis n.。 isp。,由圆形的疤痕组成,该圆形的疤痕由变色的区域或圆形至亚圆形的沟槽和A. undulatus限定。 isp。它有一个弯曲的周界,反映了犁沟的起伏路径,并且有一个刻在基板上的平坦架子。在外部犁沟中,两者都可以显示出一组圆形,椭圆形或亚多边形同心线。沙棘isp。显示了对应于不同个体发育阶段的几种形态。

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