Abstract The large holasteroid echinoid Hemipneustes striatoradiatus (Leske) was exploited by diverse invertebrate encrusters and borers during the Maastrichtian, both pre- and post-mortem. In life, the specimen described herein was perforated by multiple Oichnus simplex Bromley borings close to the apical system. Each engendered a growth reaction from the echinoid, a mound-like swelling on the external surface of the test with the boring at the centre. These would have been moved away from the apical system as the echinoid grew and inserted new plates apically. Whether this infestation was the product of numerous individual organisms or, less likely, just one organism (gastropod?) that relocated when discouraged by each mound-like swelling is uncertain. Similar growth reactions are known from other echinoderms, but associated with non-penetrative Oichnus paraboloides Bromley.

中文翻译：

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Oichnus simplex Bromley 侵染来自马斯特里赫特类型区域（上白垩纪，荷兰）的 Hemipneustes striatoradiatus（Leske）（Echinoidea）

摘要 在马斯特里赫特时期，大型海鞘类海鞘 Hemipneustes striatoradiatus (Leske) 被各种无脊椎动物结壳和蛀虫利用，包括死前和死后。在生活中，本文描述的标本被靠近顶端系统的多个 Oichnus simplex Bromley 钻孔穿孔。每个都引起海胆的生长反应，在测试的外表面上有一个土丘状的肿胀，中心是钻孔。随着海棘突生长并在顶端插入新的板块，这些会从顶端系统移开。这种侵扰是由许多个体生物造成的，还是不太可能是由一种生物（腹足类动物？）在每个土丘状肿胀的阻碍下重新定位的结果尚不确定。其他棘皮动物也有类似的生长反应，