Institute of Geology and Palaeontology, Faculty of Science Charles University, Albertov 6, 128 43, Prague 2, CZ, Czech Republic.
Palaeontological Department, National Museum, Cirkusová 1740, 193 00, Praha 9, CZ, Czech Republic.
Naturwissenschaften. 2023 Sep 25;110(5):50. doi: 10.1007/s00114-023-01879-0.
The Palaeozoic sediments of the Barrandian area are globally well-known as a classic example of rocks characterised by an abundant skeletal marine fauna, including well-preserved remains of hyoliths. Several tens specimens of malformed invertebrates such as trilobites, cephalopods and gastropods have been collected and documented from Cambrian to Devonian clastic sediments and carbonates in this area. However, no malformed hyolith specimen has yet been recorded. Hyoliths are Palaeozoic animals with small calcium carbonate shells composed of the conch (= oblong, conical and bilaterally symmetrical shell of diverse cross section and aperture at its wide end) and the operculum (= cap closing the conch aperture). Here we describe an operculum showing regeneration after non-lethal predatory attack in the Ordovician hyolith Elegantilites custos. This is the first record of regeneration in a hyolith operculum that has been repaired after a failed durophagous attack. Epibenthic/infaunal predatory echinoderms, such as ophiuroids, are considered as potential culprits.
巴兰德地区的古生代沉积物是全球著名的以丰富的骨骼海洋动物群为特征的岩石典范，包括保存完好的苔藓动物化石。在该地区的寒武纪至泥盆纪碎屑沉积物和碳酸盐中，已经收集和记录了数十个三叶虫、头足类和腹足类等畸形无脊椎动物的标本。然而，尚未记录到畸形苔藓动物化石。苔藓动物是古生代动物，其小的碳酸钙壳由壳 (= 长形、圆锥形和双侧对称的壳，具有不同的横截面和在宽端的开口) 和瓣 (= 关闭壳开口的盖子) 组成。本文描述了一种瓣，它显示出在奥陶纪苔藓动物 Elegantilites custos 经历非致命捕食攻击后的再生。这是在遭受失败的机械食者攻击后修复的苔藓动物瓣中再生的首次记录。被认为是潜在罪魁祸首的底栖/底栖捕食棘皮动物，如蛇尾类动物。
