Ammonoid radula.
Ammonoid radula.
复制标题
菊石齿舌。
DOI：
10.1007/978-94-017-9630-9_11
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Kruta;I.;Landman;N.H. and Tanabe;K.
齿舌是一种软体动物的进食装置，也存在于菊石中。它由一条带状物组成，带状物上有规则排列的几丁质牙齿，位于上下颌之间的横向行中。本章描述了十二个菊石属的齿舌。齿舌每排由七个齿组成：脊柱齿，脊柱齿两侧的两个侧齿，以及带状外部的边缘齿。边缘板只存在于少数类群中。与现代头足类相比，菊石齿舌在形态和元素数量上与鞘翅目相似。在Goniatitina的齿舌是单尖的，到目前为止表现出很小的变化，而在Ammonitina和Ancyloceratina的齿舌是更可变的，由多尖的脊柱和侧齿和细长的边缘齿。
The radula is a molluscan feeding device that was also present in ammonoids. It consists of a ribbon with regularly arranged chitinous teeth disposed in transversal rows located between the upper and lower jaws. This chapter describes the radula in twelve ammonoid genera. The radula is composed of seven teeth per row: the rachidian tooth, two lateral teeth on each side of the rachidian tooth, and the marginal teeth on the external part of the ribbon. Marginal plates are only present in a few taxa. Compared to Recent cephalopods, the radula of ammonoids is similar in morphology and number of elements to that of coleoids. The radula in the Goniatitina is unicuspidate and shows little variation so far, while the radula in the Ammonitina and Ancyloceratina is more variable and consists of multicuspidate rachidian and lateral teeth and elongate marginal teeth.