Thuy Ben, Numberger-Thuy Lea, Jagt John W M
Department of Palaeontology, Natural History Museum Luxembourg, Luxembourg City, Luxembourg.
Natuurhistorisch Museum Maastricht, Maastricht, The Netherlands.
PeerJ. 2020 Aug 24;8:e9671. doi: 10.7717/peerj.9671. eCollection 2020.
A new species of brittle star, , is recorded from the lower two meters of the Gronsveld Member (Maastricht Formation), of late Maastrichtian age (c. 66.7 Ma). These relatively fine-grained biocalcarenites reflect shallow-water deposition in a sheltered setting with a relatively firm sea floor and clear waters, under middle sublittoral and subtropical conditions. Associated echinoderm taxa comprise more robust, sturdy-plated ophiomusaid and ophiodermatid brittle stars and numerous bourgueticrinine sea lilies. The new brittle star described herein belongs to a family whose present-day members are predominantly restricted to bathyal depths. Its small size and the exceptional preservation of a single articulated specimen partially wrapped around the stalk of a bourgueticrinine suggest that n. sp. was probably epizoic and specifically associated with stalked crinoids.
一种新的蛇尾类物种，被记录于马斯特里赫特晚期（约6670万年前）格伦斯维尔德段（马斯特里赫特地层）下部两米处。这些相对细粒的生物钙质岩反映了在有遮蔽环境下的浅水沉积，海底相对坚硬，海水清澈，处于亚潮间带中部和亚热带条件下。相关的棘皮动物类群包括更粗壮、板片坚固的蛇尾目和蛇皮蛇尾类蛇尾，以及众多的布尔盖特海百合。本文描述的新蛇尾类属于一个现今成员主要局限于深海的科。它的小尺寸以及一个部分缠绕在布尔盖特海百合茎上的单节铰接标本的特殊保存状态表明，该新物种可能是附着生物，且特别与有茎海百合相关联。
