Early Palaeozoic crinoids are known only patchily from the British Isles except for accumulations at starfish beds. A single, exquisitely preserved crinoid is reported from the Telychian (Llandovery, Silurian) of the Pysgotwr Grits Formation of the Llangurig area, Powys, mid-Wales. This sedimentary succession is turbiditic in origin and poorly fossiliferous. The crinoid is a diplobathrid camerate, Euptychocrinus longipinnulus sp. nov., preserved as an external mould without counterpart. It has a high, shuttlecock-like crown; a conical, unsculptured cup; low infrabasals; a pair of long, slender, feather-like arms on each ray, each bearing numerous long pinnules; and a heteromorphic column. Most previous reports of this genus have been from the Upper Ordovician – lower Silurian series of Laurentia; uncertainly, it is described from the Upper Ordovician deposits of Morocco (Gondwana). Euptychocrinus longipinnulus is the first Avalonian occurrence. The beautiful preservation of the arms, including cover plates of pinnules, contrasts with the proxistele, which is a series of ‘broken sticks’. This crinoid responded to an adverse environmental fluctuation, probably a turbidity current, by autotomizing the stem, but it was carried downslope and buried alive.

中文翻译：

---

来自威尔士中部的下志留纪（Llandovery）双叶海百合（Camerata）

除了在海星床上的堆积外，早期古生代海百合只在不列颠群岛零星地被发现。据报道，在威尔士中部 Powys 的 Llangurig 地区的 Pysgotwr Grits 组的 Telychian (Llandovery, Silurian) 有一个保存完好的海百合。这种沉积层序起源于混浊，化石很少。海百合是一种双叶动物，长尾真鱼sp。nov.，作为没有对应物的外部模具保存。它有一个高高的羽毛球状冠；一个锥形的、未雕刻的杯子；低基底层；每条射线上有一对细长的羽毛状手臂，每条手臂上都有许多长针；和一个异形列。该属以前的大多数报道来自上奥陶统-下志留统的劳伦纪；不确定地，它是从摩洛哥（冈瓦纳）的上奥陶统沉积物中描述的。长尾真鱼是第一个阿瓦隆事件。手臂的美丽保存，包括针叶的盖板，与一系列“断棍”的 proxistele 形成鲜明对比。这种海百合通过自动切断茎来应对不利的环境波动，可能是浊流，但它被带到下坡并被活埋。