Department of Biological Sciences, University of Arkansas, Fayetteville, AR 72701, USA.
Eur J Protistol. 2012 May;48(2):103-23. doi: 10.1016/j.ejop.2011.10.001. Epub 2011 Dec 7.
Sorocarpic protists are organisms that individually aggregate and work together to form a fungus-like fruiting body (sorocarp). The amoeboid forms are often colloquially referred to as "cellular slime molds" or "acrasids". We argue the latter term should be used only to refer to members of Acrasidae in Heterolobosea. Here we study the diversity of two Acrasidae genera, Acrasis and the closely similar Pocheina, using a combination of morphological characteristics and small subunit rRNA gene sequences. A total of eight isolates of Acrasis and an example of Pocheina were examined. Acrasis/Pocheina form a well-supported monophyletic group that is the highly supported sister to a clade containing Allovahlkampfia and several other amoebae. Four molecular lineages of Acrasis were resolved, each of which is characterized by a distinctive fruiting body morphology. Each lineage represents a species, two of which are novel, Acrasis kona n. sp. and Acrasis takarsan n. sp. An isolate identified as Pocheina rosea is nested within the clade containing isolates of the taxon Acrasis rosea, into which P. rosea is tentatively subsumed. One member of the tightly knit allovahlkampfid clade was induced to form a simple sorocarp, leading us to include this clade in Acrasidae.
包囊粘菌是一种单独聚集并协同形成真菌状子实体（包囊）的生物体。变形体通常被俗称为“细胞黏菌”或“粘菌类变形体”。我们认为后一个术语应该仅用于指异网黏菌类中的 Acrasidae 成员。在这里，我们使用形态特征和小亚基 rRNA 基因序列的组合来研究 Acrasidae 属的两个属，Acrasis 和密切相关的 Pocheina 的多样性。共检查了 8 个 Acrasis 分离株和一个 Pocheina 示例。Acrasis/Pocheina 形成一个支持度很高的单系群，与包含 Allovahlkampfia 和其他几种变形虫的分支密切相关。确定了 4 个 Acrasis 的分子谱系，每个谱系都具有独特的子实体形态。每个谱系都代表一个物种，其中两个是新的，Acrasis kona n. sp. 和 Acrasis takarsan n. sp. 被鉴定为 Pocheina rosea 的分离株嵌套在包含 Acrasis rosea 分类单元的分离株的分支中，暂时将 P. rosea 归入其中。紧密结合的 Allovahlkampfia 分支中的一个成员被诱导形成简单的包囊，这使我们将这个分支归入 Acrasidae。
