Many orb-weaving spiders break the central lines of the hub at the end of web construction. Nevertheless, very little is known of how spiders break these lines and whether this behaviour differs among taxa. Here, we describe details of how Leucauge mariana (Taczanowski, 1981) breaks the central lines of the hub. Breaking hub lines varies among individuals of a single species, and may differ between species.

Three new genera and one subgenus are established: Loeblicasubgen. n. (type species: Tisaniba loebli sp. n.), Paraeuophrysgen. n. (type species: P. sumatranasp. n.), Thaiattusgen. n. (type species: T. krabisp. n.), Tisanibaineptagen. n. (type species: Tisaniba bijibijanZhang & Maddison, 2014). The subgenus Chalcovietnamicus Marusik, 1991, stat. n. is raised to a status of full genus. The genus ParvattusZhang & Maddison, 2012, syn. n. is synonymized with Chalcovietnamicus Marusik, 1991. Seventeen new species are described: Chalcovietnamicus nagasp. n. (♂, Philippines), Euochin luzonicasp. n. (♀, Philippines), Microemathis bulalacaosp. n. (♂♀, Philippines), Paraeuophrys sumatranasp. n. (♂♀, Indonesia), Thaiattus krabisp. n. (♂♀, Thailand), Tisaniba (Loeblica) inusitatasp. n. (♂♀, West Malaysia), Tisaniba (Loeblica) loeblisp. n. (♂♀, West Malaysia), Tisaniba (Loeblica) rimbosp. n. (♂♀, Indonesia), Tisaniba (Loeblica) tiomansp. n. (♂, West Malaysia), Tisaniba (s. str.) berausp. n. (♂♀, Indonesia), Tisaniba (s. str.) ligoformasp. n. (♂♀, Indonesia), Tisaniba (s. str.) mayangsp. n. (♂, Indonesia), Tisaniba (s. str.) nitidasp. n. (♂♀, Indonesia), Tisaniba (s. str.) schwendingerisp. n. (♂♀, Indonesia), Tisanibainepta pahangsp. n. (♂♀, West Malaysia), Tisanibainepta palawansp. n. (♂♀, Philippines), Tisanibainepta silvaticasp. n. (♀, Philippines). Thirteen new combinations are proposed: Chalcoscirtus jirica (Żabka, 1980), comb. n. (ex Euophrys), Chalcoscirtus nangqianensis (Hu, 2001), comb. n. (ex Euophrys), Chalcovietnamicus tengchongensis (Lei & Peng, 2012), comb. n. (ex Euophrys); Chalcovietnamicus vietnamensis (Żabka, 1985), comb. n. (ex Chalcoscirtus); Chalcovietnamicus zhui (Zhang & Maddison, 2012), comb. n. (ex Parvattus), Euochin kororensis (Berry, Beatty & Prószyński, 1996), comb. n. (ex Euophrys), Euochin subwanyan (Wang & Li, 2020), comb. n. (ex Euophrys), Euochin wanyan (Berry, Beatty & Prószyński, 1996), comb. n. (ex Euophrys), Paraeuophrys bryophila (Berry, Beatty & Prószyński, 1996), comb. n. (ex Euophrys); Phintella albopatella (Petrunkevitch, 1914), comb. n. (ex Euophrys), Tisanibainepta bijibijan (Zhang & Maddison, 2014), comb. n. (ex Tisaniba), Tisanibainepta kubah (Zhang & Maddison, 2014), comb. n. (ex Tisaniba), Tisanibainepta selasi (Zhang & Maddison, 2014), comb. n. (ex Tisaniba). Three Euophrys species names are recognized as nomina dubia: E. auricolorDyal, 1935 (♂, Pakistan), E. rubroclypeaDyal, 1935 (♀, Pakistan), E. rufaDyal, 1935 (juv., Pakistan). A brief discussion on Euophrys C. L. Koch, 1834 in South-East Asia and the nomenclature of its Oriental species is provided. Distribution of all newly described species is mapped.

Studies of the relevant literature and the holotypes of Latouchia fossoria, L. davidi, and L. cunicularia lead to the reestablishment of L. fossoriaPocock, 1901 as the type species of the genus LatouchiaPocock, 1901. L. davidi (Simon, 1886), long regarded to be the type species, is suggested to represent a separate species group within Latouchia, including L. davidi and L. stridulans. These two species differ from all other known Latouchia species by the presence of distinct ridges on the external faces of the chelicerae. The existence of different species groups within Latouchia reveal a previously unknown diversity in Asian Ummidiinae.

New faunistic and taxonomic data are provided for 24 families of Iranian spiders. As a result, six genera (Callilepis, Leptopilos, Parasyrisca (Gnaphosidae), Mastigusa (Hahniidae), Stemonyphantes, and Styloctetor (Linyphiidae)) and 43 species are recorded from Iran for the first time; three species (Hahnia rossiiBrignoli, 1977, Haplodrassus rhodanicus (Simon, 1914), and Mastigusa arietina (Thorell, 1871)) are recorded for the first time from Asia. Additionally, the previously unknown males of Tegenaria erosZamani & Marusik, 2019 and H. rossii are described, and 119 new provincial records are provided for 70 species.

A new species of the pseudoscorpion genus Parobisium, P. petilum, is described from a cave in Shasta County, northern California. It is the most troglomorphic species of the genus with remarkably slender pedipalpal segments.

Two new species of the families Agelenidae (Coelotinae) and Amaurobiidae are described from Okinawa Island, southwestern Japan, under the names Coelotes kunigamiensis sp. n. and Callobius breviprocessus sp. n. Coelotes kunigamiensis resembles C. motobuensis Shimojana, 2000 but is characterized by the male palp having a greatly bent conductor, thin epigynal teeth situated distant from each other, and blackish markings derived from the internal genitalia situated in the central portion of the epigyne. Callobius breviprocessus is related to C. amamiensisOkumura, Honki & Ohba, 2018 and C. yakushimensisOkumura, 2010, but is characterized by having a short mesal process and a broad dorsal process on the tibia of male palp, the semicircular lateral lobes of the epigyne, and the median lobe almost circular. The male palpal tibiae and female genital organs of these three species of Callobius are shown (with a correction of the former figures given in Okumura, Honki & Ohba (2018), and their morphological difference is discussed.

Phintelloides undulatus (Caleb & Karthikeyani, 2015) is redescribed, along with the description of its female for the first time. Detailed morphological description, diagnosis, and illustrations of the copulatory organs are provided. New distributional records of the species are also mapped.

The paper gives data on the jumping spiders of the Abu Dhabi Emirate. In total, 13 species are presented. One new combination is proposed: Aelurillus desertus (Wesołowska & van Harten, 2010) (ex Rafalus); first descriptions of the females of Aelurillus desertus and of Plexippus minor (Wesołowska & van Harten, 2010) are given; two species are reported for the first time in the United Arab Emirates: Afraflacilla braunsi (Peckham & Peckham, 1903) and Rudakius afghanicus (Andreeva, Hęciak & Prószyński, 1984).

A new epigean species belonging to the genus TroglotayosicusLourenço, 1981 is described from southern Ecuador based on morphological traits. This enigmatic group of scorpions was known from a single locality in Ecuador and four localities in Colombia. Troglotayosicus muranunkaesp. n. is morphologically similar to the hypogean (troglobite species) T. vachoniLourenço, 1981, but it differs from it by the trichobothrial pattern, shape of the carapace, and tegument sculpture. The new species was found actively wandering on the surface at night, which provides relevant ecological information and expands the distribution range of the genus 130 km southwards.

A new species of Umbyquyra Gargiulo, Brescovit & Lucas, 2018, Umbyquyra gurleyisp. nov., is described from Goiás, Brazil, based on distinctive palpal bulb morphology.

Genus-group names for animals established after 1930 must, according to the International Code of Zoological Nomenclature, be accompanied by the designation of a valid type species. We have found several genus-group names of Arachnida described after 1930 that were not validly formed and, while the type species were subsequently designated in mainstream taxonomic literature, including taxonomic revisions and catalogues, others were found to have been designated in the Zoological Record. The following names are determined to have a change of authorship: GlobochthoniusFinnegan, 1932 (not Beier, 1931), HeoblothrusBrowning, 1965 (not Beier, 1963), HesperochthoniusBrowning, 1970 (not Muchmore, 1968), TetrafeaellaMurthy & Ananthakrishnan, 1977 (not Beier, 1955) and ToxochernesFinnegan, 1934 (not Beier, 1932) (Pseudoscorpiones), RhinokarschiaHarvey, 2003 (not Birula, 1935) (Solifugae) and GinosigmaWhittick, 1937 (not Speijer, 1933) (Uropygi). Argentochernes (Pseudoscorpiones), Arenotherus, and Daesiella (Solifugae) are deemed to be nomina nuda. In addition, the type species of the following genus-group names are found to be different from conventional treatments: Chthonius (Globochthonius) histricusBeier, 1931 for Globochthonius; Chthonius (Hesperochthonius) oregonicusMuchmore, 1968 for Hesperochthonius; Feaella indica Chamberlin, 1931 for Tetrafeaella; and Allochernes (Toxochernes) similis Beier, 1932 for Toxochernes. The change in type species for Toxochernes results in its synonymy with Chernes (new synonymy), rather than with Allochernes.

A new species of jumping spider from the genus UroballusSimon, 1902 is described from South India. A detailed morphological description, diagnosis, illustrations of the reproductive organs, and a distribution map are provided.

The monotypic genus Barinas González-Sponga, 1987 is studied and rediagnosed, and a complementary description of the type species, Barinas flava González-Sponga, 1987, is provided. A new species, Barinas piragua sp. nov., is described from the Caribbean region of Colombia, representing the first record of the genus for the country. A brief discussion about the harvestmen in the Colombian Caribbean and the tropical dry forest of that region is offered.

The arachnid order Amblypygi is recorded for the first time in Italy, with the species Charinus ioanniticus (Kritscher, 1959). An isolated reproductive population was found in an underground air-raid shelter dating back to World War II below the city centre of Trieste. This represents the second record of this parthenogenetic species in continental Europe and also its westernmost known population.