Wrozyna Claudia, Piller Werner E, Gross Martin
University of Graz, Institute of Earth Sciences, NAWI Graz, Heinrichstrasse 26, A-8010 Graz, Austria.
Universalmuseum Joanneum, Department for Geology & Palaeontology, Weinzöttlstrasse 16, A-8045 Graz, Austria.
Crustaceana. 2014;87(8-9):1043-1071. doi: 10.1163/15685403-00003342.
Quantitative approaches dealing with soft- and hard-part morphological variability of ostracods are very rare for most species. Here we present intraspecific limb and shell variability of the Neotropical freshwater ostracod species assumed as . For the first time such an analysis considered adult females and males, as well as juveniles. Variability of the appendages included the antennule, second antenna as well as the first and second thoracopod and was analysed in terms of ratios of podomeres, setae and limbs. Limb variability of adult and juvenile individuals (down to A-3) is generally low. The highest variation is shown in podomere proportions of the antennas, while thoracopods and setae provide minor and/or non-significant influence on the variability. Based on discrimination analyses shell parameters (i.e., shell length, position of the transversal sulcus) emerge to be more important for differentiation of groups than limb ratios. Adult females exhibit a large size range in which two clearly separated morphotypes exist. Although differences in limbs are small their existence can be proven also on the basis of proportions between podomeres of the antennas. Males and juveniles, however, do not display a separation into corresponding subgroups or morphotypes. The presence of two morphologically similar females and only one type of males indicates the coexistence of female morphotypes which may represent either two (cryptic) species or a mixed reproduction population in which parthenogenetic and sexual reproduction coexists.
对于大多数介形虫物种而言，处理其软、硬体形态变异性的定量方法非常罕见。在此，我们展示了新热带淡水介形虫物种假定的种内附肢和壳体变异性。首次进行的此类分析涵盖了成年雌性、成年雄性以及幼体。附肢的变异性包括小触角、第二触角以及第一和第二胸足，并依据肢节、刚毛和附肢的比例进行了分析。成年个体和幼体（直至A - 3）的附肢变异性总体较低。触角的肢节比例显示出最高的变异性，而胸足和刚毛对变异性的影响较小和/或不显著。基于判别分析，壳体参数（即壳长、横向沟的位置）对于区分不同群体似乎比附肢比例更为重要。成年雌性呈现出较大的尺寸范围，其中存在两种明显分开的形态型。尽管附肢差异较小，但基于触角肢节之间的比例也能证明其存在。然而，雄性和幼体并未表现出分为相应亚组或形态型的情况。两种形态相似的雌性和仅一种类型的雄性的存在表明雌性形态型共存，这可能代表两个（隐性）物种，或者是孤雌生殖和有性生殖共存的混合繁殖种群。
