A novel respiratory architecture in the S ilurian mollusc A caenoplax
A novel respiratory architecture in the S ilurian mollusc A caenoplax
复制标题
志留系软体动物 A caenoplax 的一种新型呼吸结构
DOI：
10.1111/pala.12181
复制
发表时间：
2015
期刊：
影响因子：
2.6
通讯作者：
Dean C
中科院分区：
文献类型：
--
作者：
Dean C
现存的无板动物是一组无壳蠕虫状软体动物，通过后腔内或从后腔突出的附属物呼吸。呼吸结构在尾凹亚纲（腔内的栉孔虫）和管腹亚纲（外套膜本身的褶皱）之间存在差异。虽然最近的工作将其置于冠群Aplacophora中，靠近尾凹，但最初的观察表明其呼吸结构更接近solenogastres。在这里，我们提出了新的重建后ofenoplax准备与解决功能模糊时，以前的研究进行的目的。这些重建详细介绍了一种新的后部结构，不密切可比的任何现存的aplacophoran组，其中呼吸的预测产生的膜，部分封闭的中央后腔。后膜两侧有小的球形突起;膜和球形突起在无板门中显然是独特的。这个以前没有记载的呼吸系统的存在强调了古生代无板动物分支的多样性。
Extant aplacophorans, a group of shell‐less vermiform molluscs, respire through appendages within or projecting from a posterior cavity. Respiratory structures differ between the subclasses Caudofoveata (ctenidia within the cavity) and Solenogastres (folds of the mantle itself).Acaenoplax hayae, a Silurian vermiform mollusc from the Herefordshire Lagerstätte, England, exhibits characteristics of both these groups. While recent work places it within the crown group Aplacophora, near the caudofoveates, initial observations suggested that its respiratory structures were closer to those of the solenogastres. Here, we present new reconstructions of the posterior ofAcaenoplaxprepared with the aim of resolving features obscured when prior studies were undertaken. These reconstructions detail a novel posterior architecture, not closely comparable to that of either extant aplacophoran group, in which respiratory projections arise from a membrane that partly encloses a central posterior cavity. The posterior membrane is flanked by small spherical projections; both membrane and spherical projections are apparently unique within the Aplacophora. The existence of this previously undocumented respiratory system underlines the diversity of the aplacophoran clade during the Palaeozoic.