The first report of Bathynellacea in the subterranean water of Mongolia: A new species of Camacho, 2020 (Crustacea, Bathynellidae).

Background: We report the first finding of Bathynellacea, discovered in Mongolia. We also report a new species of the genus Camacho, 2020, which was previously recorded only in the western edge of Russia.

New Information: sp.

Eobathynella gwangjuensis sp. nov., a new species of Parabathynellidae (Crustacea, Bathynellacea) from South Korea.

A new species of Parabathynellidae (Crustacea, Bathynellacea) was found in the interstitial groundwater of the Yeongsangang River in South Korea. The new species belongs to the genus Eobathynella Birstein and Ljovuschkin, 1964, which previously comprised six species, including two from South Korea. Eobathynella gwangjuensis sp.

A new species of (Crustacea, Bathynellacea, Parabathynellidae) from South Korea.

A new parabathynellid bathynellacean species, , was found in the groundwater of the Geumgang River in South Korea. This is the first report of from a tributary of the Geumgang River. All previously-reported species were found in the Hangang River and the origins of the two rivers are distinct from each other.

Antarctic population of Anteholosticha sigmoidea (Foissner, 1982) Berger, 2003 (Ciliophora: Urostylidae) with notes on its phylogenetic position.

Anteholosticha sigmoidea (Foissner, 1982) Berger, 2003 was isolated from a wet soil sample collected on King George Island, Antarctica. Morphological observations and molecular phylogenetic analyses based on the gene sequences of small subunit ribosomal RNA (18S rRNA) were used to identify the species. Anteholosticha sigmoidea can be divided into two groups: group I (three populations described by Foissner 1982) and group II (described by Foissner 1984) based on the morphological differences.

The complete mitochondrial genome of the South American freshwater crayfish, (Crustacea, Decapoda, Parastacidae).

We determined the complete mitochondrial genome (mitogenome) sequence of a Chilean freshwater crayfish, (Philippi, 1882). This is the first complete mitogenome sequence of a non-Australian crayfish belonging to the family Parastacidae. The complete mitogenome of is 20,894 bp in length and contains 13 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), two ribosomal RNAs (rRNAs) and a putative control region (CR).

The complete mitochondrial genome of the Antarctic marine triclad, (Platyhelminthes, Tricladida, Maricola).

For the first time, we report the complete mitochondrial genome (mitogenome) sequence of the marine triclad species, . The complete mitogenome of was 15,185 bp in length, contains 12 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), and 2 ribosomal RNAs (rRNAs). Compared to previously reported gene orders from the order Tricladida, had unique gene order.