The palaeobiology of nerineacean gastropods
The palaeobiology of nerineacean gastropods
复制标题
螺科腹足动物的古生物学
DOI：
10.1080/08912969009386525
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
M. J. Barker
中科院分区：
文献类型：
--
作者：
M. J. Barker
在已保存在细粒碳酸盐沉积物中的Nerineacea腹足类中，经常可以发现螺旋盘绕的体腔内含有的方解石棒系统的残余物。这些棒的位置、它们的岩相学和侧支的存在表明它们代表腹足类消化腺/性腺复合体内的原始管道系统。Nerineids分泌的特征性内部螺旋褶皱位于消化腺/性腺复合体的主要叶之间，这可能是以牺牲营养储存能力为代价的。在孔和顶点的褶皱的情况下，连同在Lias的超家族的起源，表明折叠不是作为一种保护性适应对硬食性软体动物的发展。相反，碳酸钙的沉积内部使这些腹足类动物利用碳酸盐底物的食物资源，最初在底栖动物和随后的表栖动物。大多数生态潜水员...
Amongst nerineacean gastropods which have been preserved in fine grained carbonate sediments, remnants of a calcite rod system contained within the helically coiled body chamber can frequently be found. The position of these rods, their petrography and the presence of side branches suggest that they represent the original duct system within the digestive gland/gonad complex of the gastropod. The characteristic internal spiral folds secreted by the nerineids were emplaced between the major lobes of the digestive gland/gonad complex, possibly at the expense of the nutrient storage capacity. The absence of folds at the aperture and apex, together with the origin of the superfamily in the Lias, indicates that folding was not developed as a protective adaptation against durophagous molluscivores. Instead, the deposition of calcium carbonate internally enabled these gastropods to exploit the food resources of carbonate substrates, initially infaunally and subsequently epifaunally. Most of this ecological divers...