Siddall M E, Reece K S, Graves J E, Burreson E M
Virginia Institute of Marine Science, College of William and Mary, Gloucester Point 23062, USA.
Parasitology. 1997 Aug;115 ( Pt 2):165-76. doi: 10.1017/s0031182097001157.
The phylogenetic affinities of the oyster pathogen Perkinsus marinus were investigated with morphology, 18S-like rDNA data and actin sequence data. Morphological investigations revealed that Perkinsus species do not have a conoid and that other criteria which have been used to place them in the Apicomplexa are general to alveolates. When considered separately, 18S-like rDNA and actin data sets each support a closer affinity for Perkinsus marinus with the dinoflagellates. However, each of these separate analyses possess their own biases and weaknesses. Use of the phylogenetic principle of 'total evidence' in which data sets are combined in simultaneous analysis yielded a more robust hypothesis that is stable both to character and taxonomic sampling. The resulting cladogram strongly corroborates the placement of Perkinsus species with the Dinoflagellida and not with the Apicomplexa.
利用形态学、类18S核糖体DNA数据和肌动蛋白序列数据，对牡蛎病原体马氏派琴虫的系统发育亲缘关系进行了研究。形态学研究表明，派琴虫属物种没有类锥体，而其他用于将它们归入顶复门的标准在所有囊泡虫类中都是常见的。单独考虑时，类18S核糖体DNA和肌动蛋白数据集均支持马氏派琴虫与甲藻有更密切的亲缘关系。然而，这些单独的分析都有各自的偏差和弱点。运用“完全证据”的系统发育原则，即将数据集在同步分析中进行合并，得出了一个更可靠的假说，该假说在特征和分类抽样方面都很稳定。由此得到的分支图有力地证实了派琴虫属物种与甲藻纲归在一起，而不是与顶复门归在一起。
