A new species of the genus Callobius is described from Yakushima Island, Kyushu, Japan, under the name of Callobius yakushimensis. This species is characterized by having a long unique apophysis on the tibia of the male palp, and two linguiform lobes laterally in the epigynum.
The male of Platocoelotes uenoi (Yamaguchi & Yaginuma 1971), n. comb. is described for the first time on the basis of specimens collected from Fukue Island, Kyushu, Japan. The species is transferred from the genus Coelotes. Draconarius coreanus (Paik & Yaginuma 1969) is recognized for the first time from Japan on the basis of a female specimen collected from Tsushima Island. The spider was first recorded as Coelotes sp. from the same island by Yaginuma et al. (1976).
Attention is drawn to the pseudoscorpion taxa published by Kyukichi Kishida (1927, 1929, 1940, 1947), which have been largely ignored in the literature outside Japan. Kishida (1929) was the first author to employ the names Chthonioidea Daday, 1888, Cheliferoidea Risso, 1826, Feaelloidea Ellingsen, 1906, Garypoidea Simon, 1879 and Olpioidea Banks, 1895 at the superfamilial rank, and the first to use the names Olpiidae Banks, 1895 and Pseudogarypidae Chamberlin, 1923 at the familial rank. He was also the first to propose a family-group name based on the genus Atemnus Canestrini, 1884, and is therefore the author of the family Atemnidae Kishida, 1929 and the coordinate subfamily Atemninae Kishida, 1929. The suborders Schizonota Kishida, 1929 and Holonota Kishida, 1929 are polyphyletic. Chelanops nipponicus (Kishida, 1927) is synonymized with Haplochernes boncicus (Karsch, 1881) (new subjective synonymy). Chelifer chamberlini Kishida, 1940, which was apparently described from Harbin, China, is considered a species inquirenda. The pseudoscorpion nomina nuda published by Kishida are listed.
A new gnaphosid species is described from Taiwan under the name of Zelotes nishikawai. This species is distinguished from Z. iriomotensis Kamura 1994 by male palpal structure in which expanded embolar base is situated more prolaterally and widely covering subtegulum, and female epigynum with median plate wider in posterior part.
Siler collingwoodi (O. Pickard-Cambridge, 1871) (Salticidae) was newly recorded from Japan based on specimens collected from Iriomotejima Island at Okinawa Prefecture. This species is easily distinguishable from the other Japanese jumping spiders by its appearance and genital morphology.
A new species belonging to the genus Chaerilus Simon, 1877, Chaerilus spinatus sp. n. is described from the Island of Halmahera, Indonesia. Chaerilus celebensis Pocock, 1894, originally described from Luwu, Celebes (Sulawesi) Island, is confirmed as a distinct species and as a possible endemic element to the Celebes. Two species of Chaerilus are at present known to Halmahera, the second one being Chaerilus telnovi Lourenço, 2009.
The Taiwanese and Japanese spiders which have been identified with Cyrtophora moluccensis (Doreshall 1857) are taxonomically revised. Three color morphs, yellow-, green-, and red-types, show their own discrete monophyletic clades in the phylogenetic tree inferred by Neighbor Joining method using the partial sequences of mt-16S-rRNA genes. P-distances within group means are 0.2% in the yellow-type, 0.1% in the green-type, and 0% in the red-type. P-distances between group means are 18.8% between yellow- and green-types, 19.4% between yellow- and red-types, 10% between green- and red-types. These three color morphs can be separated also by the shapes of epigynum and male palp. Consequently we recognize them as three independent nominal species and determined the yellow-type as C. cylindroides (Walckenaer 1842), the green-type as C. moluccensis (Doleschall 1857), and the red-type as C. ikomosanensis (Bösenberg & Strand 1906).
A male of Paraplectana sakaguchii Uyemura 1938 is described for the first time using specimens obtained by rearing juvenile spiders. The morphological and molecular features are used for the identification of the specimens.
A new linyphiid species, Oilinyphia jadbounorum, is described using the specimens collected from Khuan Khao Wang Forest Park, Thailand. The only species of the genus, O. peculiaris, has been known from Ryukyu Islands, Japan. The discovery of this new species reveals the occurrence of the genus in Southeast Asia.