The anatomy of the solute Girvanicystis batheri (?Chordata) from the Upper Ordovician of Scotland and a new species of Girvanicystis from the Upper Ordovician of South Wales
The anatomy of the solute Girvanicystis batheri (?Chordata) from the Upper Ordovician of Scotland and a new species of Girvanicystis from the Upper Ordovician of South Wales
复制标题
苏格兰上奥陶统溶质Girvanicystis Batheri（？脊索动物）的解剖和南威尔士上奥陶统Girvanicystis新种
DOI：
--
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
P. Daley
中科院分区：
文献类型：
--
作者：
P. Daley
详细的解剖学研究的溶质Girvanicystis batheri从Girvan海星床（阿什吉尔），使口腔分区，水孔，生殖孔和可能的开放的鳃裂被确定。消化道远端和胃位于头后部。被保存为斯坦克南的结构被解释为大脑和左脑神经。本文对G. batheri支持了它是一种悬浮食饵动物的假设。贝氏格氏囊虫的特征是头部背侧有大的骨板，摄食臂有20个环，头部腹侧有结节状的中骨板。本文报道了格孢囊霉属（Girvanicystis）一新种，G. Casteri，描述于南威尔士的Sholeshook石灰岩（Ashgill）。Girvanicystis casteri与G. batheri的特征在于前者具有较窄的头部、较长的进食臂和位于头部腹面正中板上的刺。Girvanicystis batheri与角形Ceratocystis perneri的特征相似，即头部骨骼的大板、左右边缘凸缘、背侧前尾板相对、腹侧前尾板交替，表明G. Batheri也可以是茎脊索动物。
Detailed anatomical study of the solute Girvanicystis batheri from the Girvan starfish bed (Ashgill) has enabled the oral partition, hydropore, gonopore and the possible opening of a branchial slit to be identified. The distal part of the alimentary tract and the stomach were located in the posterior part of the head. Structures preserved as steinkernen are interpreted as a brain and left cranial nerve. The gross anatomy of G. batheri supports the hypothesis that it was a suspension feeder. Girvanicystis batheri is characterized by large plates on the dorsal surface of the head, 20 rings of the feeding arm and a nodular median plate on the ventral surface of the head. A new species of Girvanicystis, G. casteri, is described from the Sholeshook limestone (Ashgill) of South Wales. Girvanicystis casteri is distinguished from G. batheri in that the former has narrower head, a longer feeding arm and a spine on the median plate of the ventral surface of the head. Girvanicystis batheri has characters in common with the cornute Ceratocystis perneri, namely large plates of the skeleton of the head, right and left marginal flanges, opposite dorsal fore tail plates and alternate ventral fore tail plates, which suggest that G. batheri may also be a stem chordate.