Geometric morphometric analysis in female freshwater crabs of Sarawak (Borneo) permits addressing taxonomy-related problems
Geometric morphometric analysis in female freshwater crabs of Sarawak (Borneo) permits addressing taxonomy-related problems
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DOI：
10.7717/peerj.6205
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发表时间：
2019-02-14
期刊：
影响因子：
2.7
通讯作者：
Ng, Peter K. L.
中科院分区：
文献类型：
--
作者：
Grinang, Jongkar;Das, Indraneil;Ng, Peter K. L.
淡水蟹的分类学需要在方法方法上进行范式改变，特别是在使用形态学技术的调查中。传统的形态测量方法（二维测量）往往不适合识别淡水蟹，因为它们的外部形态多变，雌性缺乏性腺（通常用于识别雄性蟹）。在本研究中，我们探索了几何形态测量技术在雌性淡水蟹鉴定中的潜在应用，并确定了物种的分类关键特征。甲壳的形状可以作为鉴别雌蟹的一个很好的特征，特别是当使用几何形态测量技术时。我们观察到，甲壳的形状比pleon和chela的形状有优势，因为它相对平坦的方向允许更一致和更容易的几何形态分析数据准备。几何形态测量技术是廉价的，相对较少的时间消耗使用，和准确。当解剖检查性腺器官是不可能的，这种技术是方便的，这可能会损害标本在濒危或稀有物种的情况下。由于该技术仅用于两个物种，因此在证明该方法的可靠性之前，需要更令人信服和广泛的证据。
The taxonomy of freshwater crabs requires a paradigm change in methodological approaches, particularly in investigations that use morphological techniques. The traditional morphometric approach (two-dimensional measurements) tends to be inappropriate for the identification of freshwater crabs due to their variable external morphology and lack of gonopods (conventionally used for the identification of male crabs) in females. In this study, we explore the potential use of the geometric morphometric technique for identification of female freshwater crabs, and identify taxonomic key characteristics of species. The shape of the carapace could be a good characteristic for the identification of female crabs, especially when the geometric morphometric technique is used. It was observed that the shape of the carapace has an advantage over the shape of the pleon and chela because its relatively flat orientation allows more consistent and easier data preparation for geometric morphometric analysis. The geometric morphometric technique is inexpensive, relatively less time consuming to employ, and accurate. This technique is convenient when dissection to examine the gonopods is not possible, which can damage the specimen in the case of endangered or rare species. Since the technique was used herein for only two species, more compelling and extensive evidence is needed before the reliability of the method can be proven.