, a new species of Melitidae (Crustacea, Amphipoda) from Japan.

A new intertidal species of the melitid amphipod, , from the Wakayama Prefecture, Japan, is identified and described. differs from the similar and by its black-and-white body color, well-developed anterodistal projection of the male gnathopod 1 propodus, and telson armature. Molecular phylogenetic analyses based on the nuclear 28S rRNA and mitochondrial COI genes support that is closely related to and .

Recent advances in liquid biopsy of central nervous system lymphomas: case presentations and review of the literature.

Surgical biopsy is the gold standard for diagnosing central nervous system (CNS) lymphomas. However, reliable liquid biopsy methods for diagnosing CNS lymphomas have quickly developed and have been implicated in clinical decision-making. In the current report, we introduce two patients for whom liquid biopsy was essential for diagnosing CNS lymphomas and discuss the rapidly growing applications of this technology.

A new species of the genus Pseudocrangonyx (Crustacea: Amphipoda: Pseudocrangonyctidae) from subterranean waters of Japan.

A new species of pseudocrangonyctid amphipod, Pseudocrangonyx asuwaensis, is described from subterranean water in a quarry on Mt. Asuwa "Nanatsuo-guchi", Fukui Prefecture, Japan. Pseudocrangonyx asuwaensis sp.

A new species of the genus from the Seto Inland Sea, Japan (Crustacea, Amphipoda, Podoceridae).

A new podocerid amphipod, , is described from the Etajima Island, the Seto Inland Sea, Japan. This new species differs from its congeners by the dorsal carination of pereonites and pleonites, and form of the antenna 1, gnathopods 1 and 2, uropods 1 and 2, and telson. Nucleotide sequence data of the mitochondrial cytochrome subunit I (COI) from a paratype of is provided for future molecular systematic studies.

A New Species of the Genus (Crustacea: Amphipoda: Pseudocrangonyctidae) from Yonaguni Island, Southwestern Japan, and Historical Biogeographic Insights of Pseudocrangonyctids.

The subterranean amphipod genus is diverse in Far East Asia, including the Japanese Archipelago. However, species have not been recorded from the Ryukyu Islands, which extend southwest of the Japanese Archipelago. This study describes a new species of , sp.

On the brink of extinction: a new freshwater amphipod (Anisogammaridae) from Japan.

Freshwater habitats, especially cold springs, are environments in which the risk of extinction faced by organisms remains high due to human activities. To conserve endangered species, it is important to describe and name them. Here, a new, endangered freshwater anisogammarid amphipod species, Jesogammarus (Jesogammarus) acalceolus, found in a spring in Aomori Prefecture, Japan, is described which is potentially the sole remaining habitat of this species.

A new species of from Shinkai Seep Field, Mariana Trench (Crustacea, Amphipoda, Pardaliscidae).

A new pardaliscid amphipod, , is described from a single female captured at the Shinkai Seep Field, Mariana Trench, from a depth of 5,689-5,683 m. A key to species of is provided. This is the first species of to be described from the Mariana Trench, and the second report of this genus from this region.

Complete mitochondrial genome of (Crustacea: Amphipoda: Pseudocrangonyctidae).

The complete mitochondrial genome of a subterranean pseudocrangonyctid amphipod, , was determined in this paper. The complete mitogenome of . was 14,814 bp in length with the typical 13 protein-coding genes, 22 transfer RNAs, two ribosomal RNAs, and a control region (CR).

The complete mitochondrial genome of () (Crustacea: Amphipoda: Anisogammaridae).

We determined the mitogenome sequence of () Morino, 1993, which is the first complete mitogenome sequence in the family Anisogammaridae Bousfield, 1977. The complete mitogenome of . (.

Species of the Maera-clade collected from Japan. Part 4: addenda to genera Maera Leach, 1814 and Quadrimaera Krapp-Schickel Ruffo, 2000, with revised keys to Japanese species of the clade (Crustacea: Amphipoda: Maeridae).

Two new species of Maera Leach, 1814 and Quadrimaera Krapp-Schickel Ruffo, 2000 included in the Maera-clade are described from Japan. Maera denticoxa sp. nov.

Molecular phylogenetic position of Minamitalitrus zoltani elucidates a further troglobisation pattern in cave-dwelling terrestrial amphipods (Crustacea: Talitridae).

Talitrids are a highly diverse group of amphipod crustaceans that have colonized various terrestrial habitats. Three genera have successfully adapted to cave habitats on islands in the Pacific and Atlantic Oceans. However, the evolutionary origin of the Pacific troglobitic talitrids has remained unknown.

A new species of from the Bering Sea (Crustacea, Amphipoda, Pardaliscidae), with a redescription of .

A new pardaliscid amphipod, , is described from the Bering Sea at depths between 520 and 536 m, and Bruzelius, 1859 is redescribed based on specimens from Fredrikshald, Norway, near the species' type locality. Nucleotide sequences of mitochondrial cytochrome oxidase subunit I (COI) from the holotype and a paratype of are reported. While is similar to , it differs from the latter in having an asetose palp article 1 of maxilla 1, a gnathopod 1 coxa with a straight distal edge, and in the posterior margin of the basis of gnathopods 1 and 2, and pereopod 3, being heavily setose in females.

A new cave amphipod, sp. nov. (Crustacea, Amphipoda, Pseudocrangonyctidae), from the Korean Peninsula.

A new species of pseudocrangonyctid amphipod, , was found in the groundwater of a cave in the southwestern Korean Peninsula. is morphologically most closely related to Lee et al., 2020.

A new species of the genus Rhachotropis from off Amamioshima Island, northwestern Pacific (Crustacea: Amphipoda: Eusiridae).

A new species of the eusirid amphipod, Rhachotropis reiwa is described from off Amamioshima Island, northwestern Pacific. The new species differs from its congeners in having large eyes, the middorsal tooth on pereonite 7, pleonite 3 and urosomite 1 without middorsal and dorsolateral teeth, the basis of pereopod 5 strongly produced posteriorly, and pereopod 6 with the triangular basis. A key to the species of Rhachotropis from Japanese and adjacent waters is provided.

A new species of the genus Pseudocrangonyx (Crustacea: Amphipoda: Pseudocrangonyctidae) from Simbok Cave, Korea.

A new subterranean species of pseudocrangonyctid amphipod, Pseudocrangonyx joolaei, is described from the groundwater of a cave in South Korea. Pseudocrangonyx joolaei sp. nov.

Rediscovered syntypes of Procrangonyx japonicus, with nomenclatural consideration of some crangonyctoidean subterranean amphipods (Crustacea: Amphipoda: Allocrangonyctidae, Niphargidae, Pseudocrangonyctidae).

Two missing syntypes of the Japanese subterranean amphipod Procrangonyx japonicus (Uéno, 1930), the type species of Procrangonyx Schellenberg, 1934, were rediscovered in the collections of the Kyoto University Museum. The morphology of uropod 3, which has been considered the principal diagnostic character of the genus, is redescribed on the basis of one of the syntypes, and the nomenclatural history of the generic names Procrangonyx and Eocrangonyx Schellenberg, 1937 (corrected from 1936) for some Far-Eastern subterranean amphipod species is reviewed. Owing to confusion between the terms "type fixation" and "type designation"-the latter being just one means of accomplishing the former-the view that Procrangonyx is unavailable and invalid has prevailed in recent literature.

A new species of the genus Elasmopus from Miyako Island, Japan (Crustacea: Amphipoda: Maeridae).

A new species of the maerid amphipod, Elasmopus nkjaf, from Miyako Island, Ryukyu Islands, Japan, is named and described. Additionally, nucleotide sequences of nuclear 28S ribosomal RNA and histone H3 as well as mitochondrial cytochrome c oxidase subunit I and 16S ribosomal RNA from its holotype and paratype were determined. Elasmopus nkjaf sp.

Reassessment of the Groundwater Amphipod Paramoera relicta Synonymizes the Genus Relictomoera with Paramoera (Crustacea: Amphipoda: Pontogeneiidae).

The systematic status of the stygobitic amphipod, Paramoera relicta Uéno, 1971, was revisited based on morphological examination of the paratypes, and molecular phylogenetic analyses using a newly collected specimen from its type locality. The paratypes clearly showed that this species does not possess the "sinusoid" antennal sinus in the head, which was erroneously described in the original description of this species; P. relicta is unquestionably classified within the genus Paramoera Miers, 1875 .

The complete mitochondrial genome of (Crustacea: Amphipoda: Pseudocrangonyctidae).

The complete mitogenome sequence of a subterranean pseudocrangonyctid amphipod, , was determined. The complete mitogenome of was 15,069 bp in length with the typical 13 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (rRNAs), and a control region (CR). This is the first complete mitogenome sequence in the family Pseudocrangonyctidae.

A new species of from Japan (Crustacea, Amphipoda, Melitidae).

A new brackish-water species of melitid amphipod, , from the Choshigawa River, Mie Prefecture, Japan, is named and described. is distinguished from the most similar (Uéno, 1940) by having an elongate and weakly arched male uropod 3, and a deep and strongly hooked anterior lobe of the coxa on the female's pereopod 6. Nucleotide sequences of the mitochondrial cytochrome oxidase subunit I (COI) of and support divergence at the species level.

A new species of the genus (Crustacea, Amphipoda, Pseudocrangonyctidae) from Korea.

A new subterranean species of pseudocrangonyctid amphipod, is described from the interstitial waters in Daejeon, Korea. is distinguished from three morphologically similar congeners, Uéno, 1966, Sidorov, 2009, and Tomikawa & Sato, 2016, by the characteristics of antenna 1, antenna 2, mandible, gnathopod 2, pleopods, uropods 1-2, and telson. Molecular phylogenetic analyses based on nuclear 28S rRNA and histone H3, and mitochondrial cytochrome oxidase subunit I and 16S rRNA genes revealed that is a sister species of the unnamed sp.

Molecular Phylogeny and Surface Morphology of Thiriotia hyperdolphinae n. sp. and Cephaloidophora oradareae n. sp. (Gregarinasina, Apicomplexa) Isolated from a Deep Sea Oradarea sp. (Amphipoda) in the West Pacific.

In an effort to broaden our understanding of the biodiversity and distribution of gregarines infecting crustaceans, this study describes two new species of gregarines, Thiriotia hyperdolphinae n. sp. and Cephaloidophora oradareae n.

Evaluation of the Systematic Status of Geographical Variations in Arcuphantes hibanus (Arachnida: Araneae: Linyphiidae), with Descriptions of Two New Species.

The systematic status of geographical variants of Arcuphantes hibanus Saito, 1992 belonging to the A. longiscapus species group, indigenous to western Honshu and Shikoku, Japan, was evaluated using morphological and molecular data. Two species, A.

A new species of the genus from Japan (Crustacea, Amphipoda, Pardaliscidae).

A new species of the pardaliscid amphipod, , from off Cape Toi, Japan, is named and described. This is the first record of Bruzelius, 1859 from the western Pacific coast of the Japanese archipelago. Additionally, nucleotide sequences of nuclear 28S ribosomal RNA and histone H3 as well as mitochondrial cytochrome oxidase subunit I (COI) and 16S ribosomal RNA from the holotype and paratypes were determined.

Rho-kinase regulates extracellular matrix-mediated osteogenic differentiation of periodontal ligament cells.

The periodontal ligament (PDL) cells contain heterogeneous mesenchymal cell populations, which have the ability to differentiate into cells that produce adjacent mineralized tissues and abundant extracellular matrix (ECM). ECM is essential not only for the homeostasis of the periodontal tissue, but also for controlling the differentiation of the PDL cells. The process of differentiation involves mechanotransduction, which links the ECM to the cytoskeleton.