Korotnevella (Amoebozoa, Dactylopodida) is a genus of naked lobose amoebae with a dactylopodial morphotype. The cell membrane of these amoebae is covered with a monolayer of scales. The structure and size of scales are considered as species-specific features. Here, we describe a new marine species, Korotnevella mutabilis n. sp., isolated from the bottom sediment sample of Nivå Bay (Baltic Sea, The Sound) and studied with light and electron microscopy as well as with molecular phylogenetic analysis. This species has a number of morphological similarities with Korotnevella monacantholepis, such as size of the cell, L/B ratio, the nucleus structure and the type of a biotope from which both species were isolated. At the same time, Korotnevella mutabilis n. sp. differs from K. monacantholepis in the structure of basket-shaped scales: Korotnevella mutabilis n. sp. has an enclosed hammock-shaped latticework basket and up to two spines while K. monacantholepis has an opened two-row latticework basket and never has two spines. According to molecular phylogenetic analyses based on the sequences of the mitochondrial COI gene, Korotnevella mutabilis n. sp. is a distinct species, highly divergent from other Korotnevella species.

Korotnevella（Amoebozoa，Dactylopodida）是裸露的变形虫的属，具有拟足动物的形态型。这些变形虫的细胞膜覆盖有一层鳞片。鳞片的结构和大小被认为是特定物种的特征。在这里，我们描述了一种新的海洋物种，Korotnevella mutabilis n。，从Nivå湾（波罗的海，海峡）的底部沉积物样品中分离出来，并通过光镜和电子显微镜以及分子系统发育分析进行了研究。该物种与莫氏小球藻具有许多形态上的相似性，例如细胞大小，L / B比，细胞核结构以及从中分离出两个物种的生物群落类型。同时，科氏杆菌。sp。在篮子形鳞片的结构上与K. monacantholepis不同：Korotnevella mutabilis n。sp。有一个封闭的吊床形格子篮，最多有两个刺，而K. monacantholepis有一个打开的两排格子篮，从来没有两个刺。根据基于线粒体COI基因突变的Korotnevella mutabilis n的分子系统发育分析。sp。是一种独特的物种，与其他柯氏杆菌物种高度不同。