Do deviants live longer? Morphology and longevity in trachyleberidid ostracodes
Do deviants live longer? Morphology and longevity in trachyleberidid ostracodes
复制标题
变态者会长寿吗？
作者：
L. H. Liow
摘要 持久性化石类群违反了进化范式：普遍的形态变化和分类更替。滑行持续时间的比较研究通常从生物地理学、气候和生态的角度进行，重点关注过程。在这里，我使用形态学方法来研究海洋生物和足足介形类化石大家族（Trachyleberididae sensu lato）的长寿模式。我通过使用离散形态数据和轮廓数据来测试地质寿命较长的属在形态上是否比寿命较短的属更偏离群体平均值。我发现长寿的属通常与寿命较短的属相比，在形态上与平均形态的偏差并不显着。然而，我发现，同时期的长寿粗眼动物亚群在离散形态方面通常比寿命较短的粗眼动物亚群至少稍微显着地更加异常，尤其是在外部形态方面。形态偏差和数据其他细分中的持续时间之间没有出现显着的关联模式（即，整个数据集、出生队列、形态特征组以及使用傅立叶分析和特征形状分析的轮廓数据）。这与之前的发现形成鲜明对比，即海百合目中寿命较长的属在形态上的异常程度往往低于其寿命较短的亲属，而不是偶然预期的。
Abstract Persistent fossil taxa contravene paradigms of evolution: pervasive morphological change and taxic turnover. Comparative studies of taxic duration have often been approached from biogeographic, climatic, and ecological perspectives, with a focus on process. Here I use a morphological approach to study the pattern of longevity of a large family of marine living and fossil podocopid ostracodes, Trachyleberididae sensu lato. I test if geologically longer-lived genera are collectively morphologically more deviant from a group mean than their shorter-lived relatives by using both discrete morphological data and outline data. I discovered that long-lived genera are in general not significantly more or less morphologically deviant from the average morphology than their shorter-lived relatives. However, I found that contemporaneous subsets of long-lived trachyleberidids are often at least marginally significantly more deviant in discrete morphology than shorter-lived ones, especially in external morphology. No significant patterns of association between morphological deviation and durations in other subdivisions of the data emerged (i.e., whole data set, birth cohorts, groups of morphological characters, and outline data using both Fourier analysis and eigenshape analysis). This is in contrast to a previous finding that long-lived genera of crinoids within orders are often morphologically less deviant than their shorter-lived relatives than expected by chance.