Ride on female for "prima nocta" or close attachment in the araneid spider Caerostris sumatrana Strand, 1915 (Araneae: Araneidae).

A unique type of mate guarding behavior is discovered in the araneid spider Caerostris sumatrana Strand, 1915: the male waits for the female's maturity while staying tied to the dorsal surface of her abdomen. The species is redescribed in detail. General appearance of the male and its fine structures are illustrated by scanning electron microscopy for the first time. Genital emasculation in the male of this species is reported for the first time.

Two new species of Kiekie Polotow & Brescovit, 2018 (Araneae: Ctenidae) from the highlands of Panama.

Two new species, Kiekie almae sp. n. and K. dietrichi sp. n. are described based on both sexes collected in highlands of Central America (Panama). Live males and females of both species were photographed in situ. A distribution map of all Panamanian Kiekie species is given based on new and literature-derived records.

A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species.

Two new species of Acantheis Thorell, 1891 are described from Sumatra Island: A. andreimishenini sp. n. () and A. sergeimishenini sp. n. (). Detailed descriptions, digital photographs and a distributional map are provided. Male copulatory organs and habitus of A. dimidiatus (Thorell, 1890) from the same island are shown for the first time. The male and female copulatory organs of Acantheis are described in detail for the first time.

A survey of Sumatran Ctenidae (Araneae). 2. Three new species of Bowie Jger, 2022.

Three new species, Bowie beruang sp. nov., B. binturong sp. nov., and B. dhole sp. nov., are described from Sumatra (Indonesia). Each species description is based on both sexes. Detailed descriptions, digital photographs and a distributional map are provided.

On two enigmatic spiders (Araneae: Cybaeidae amp; Phrurolithidae) from the Russian Far East.

Cybaeota Chamberlin Ivie, 1933, a genus previously known only in the Nearctic, has been found in the Maritime Province of Russia for the first time. It is represented by a new species, C. wesolowskae sp. nov. (♂♀), which is close to the generotype, C. calcarata (Emerton, 1911). Additionally, a new species, Phrurolithus lindemanni sp. nov. (♀), is described from the Maritime Province as well. It has unusually light colouration in comparison to other congeners. Trans-Pacific disjunctive ranges on species, genus and family levels in arthropods are briefly discussed.

A survey of Diphya Nicolet, 1849 (Araneae: Tetragnathidae) from South Africa.

In this paper, five species of Diphya Nicolet, 1849 are recognized in the fauna of South Africa. Four of these species are new: D. foordi sp. nov. (♂♀), D. leroyorum sp. nov. (♂), D. vanderwaltae sp. nov. (♀) and D. wesolowskae sp. nov. (♂♀). The male of D. simoni Kauri, 1950 is described for the first time. Diphya tanikawai Marusik, 2017 syn. nov. was found to be a junior synonym of D. simoni. Descriptions with illustrations, photographs and SEM images are provided for all species. The relationship between the South African and the Neotropical Diphya species is briefly discussed.

New data on Parasyrisca (Araneae: Gnaphosidae) from Mongolia.

Three new species of Parasyrisca Schenkel, 1963 belonging to the potanini-group are described from Western Mongolia: P. platnicki sp. n., P. polchaninovae sp. n. and P. szinetari sp. n. Each species description is based on both sexes. Both the male and female of P. platnicki sp. n. possess some copulatory organ characters unknown in other species of the genus. The previously unknown female and the poorly known male of P. khubsugul Ovtsharenko, Platnick et Marusik, 1995 are described and redescribed respectively, the descriptions being based on the specimens found in Arkhangai and Bayankhongor Aimags. The structures of copulatory organs in Parasyrsca potanini-group are briefly discussed.

A survey of the Porrhoclubiona Lohmander, 1944 from Central Asia (Araneae, Clubiondae).

Clubiona Latreille, 1804, with more than 500 named species, is one of the largest genera of Araneae. The genus has 15 synonyms, most of which are not listed in the World Spider Catalog (2018) and unknown to many arachnologists. The most comprehensive survey of Clubiona sensu lato by Wunderlich (2011) also lacked a few synonyms. In this paper all genus group names described in Clubiona are listed with their type species. Most of these names correspond to the species groups recognised in Clubiona sensu lato. We agree that Porrhoclubiona Lohmander, 1944 (= Clubionagenevensis-group) deserves a status of a separate genus and provide the diagnosis of this taxon. Three species of Porrhoclubiona that occur in Central Asia are surveyed, and two of them are described as new to science: P.laudata (O. Pickard-Cambridge, 1885), comb. n. (♂♀, Xinjiang, Tibet, China), P.bosmansi sp. n. (♂♀, Tajikistan), and P.moradmandi sp. n. (♂♀, Fars, Iran). It seems that all records of P.genevensis L. Koch, 1866 from China refer to P.laudata. The records of Clubionavegeta Simon, 1918 from Tajikistan and Iran refer to P.bosmansi sp. n. and P.moradmandi sp. n., respectively. The following new combinations have been established: Porrhoclubionadecora (Blackwall, 1859), comb. n., P.diniensis (Simon, 1878), comb. n., P.leucaspis (Simon, 1932), comb. n., P.minor (Wunderlich, 1987), comb. n., P.pseudominor (Wunderlich, 1987), comb. n., P.pteronetoides (Deeleman-Reinhold, 2001), comb. n., P.vegeta (Simon, 1918), comb. n., P.viridula (Ono, 1989), comb. n., and P.wunderlichi (Mikhailov 1992), comb. n. (all ex. Clubiona). SEM study of the structure considered earlier as scopula in Clubiona and Porrhoclubiona reveals that it is represented by several lateral rows of movable macrosetae (spines) with a locking mechanism.

Redescription of the Himalayan Trachelas costatus (Araneae: Trachelidae).

O. Pickard-Cambridge (1885) described Trachelas costata based on female specimens from two localities in the Himalayas. Since then it was only mentioned in two works by Simon (1897, 1906). The World Spider Catalog (2018) indicates its distribution as "China (Yarkand)". All of the species described by O. Pickard-Cambridge (1885), based on material collected during the Second Yarkand Mission, are stored in the Oxford University Museum of Natural History. Vials with material described in this paper contain no species and locality labels (Prószynski Zochowska 1981; Marusik 1993). It was not difficult to recognize the syntypes of this species due to the figures given by O. Pickard-Cambridge, and also because it is the only trachelid described from Yarkand to date. The goals of our paper are to redescribe Trachelas costatus in detail, designate a lectotype, and comment on its distribution and relationships.

New data on Synaphosus (Araneae: Gnaphosidae) from Southeast Asia.

Three new species of Synaphosus Ovtsharenko, Levy et Platnick, 1994 are described from Southeast Asia: S. jaegeri sp. n. (♂♀, Laos), S. lehtineni sp. n. (♂♀, Sulawesi, Indonesia) and S. dubius sp. n. (♀, Thailand). Two species, S. femininis Deeleman-Reinhold, 2001 and S. evertsi Ovtsharenko, Levy et Platnick, 1994 are redescribed. Synaphosus kris Deeleman-Reinhold, 2001, syn. n. known from Bali is synonymised with S. evertsi known from Ivory Coast. Synaphosus evertsi is reported from the Philippines for the first time.

A new species of Acantholycosa baltoroi-group (Araneae: Lycosidae, Pardosinae) from the Russian Far East.

Acantholycosa Dahl, 1908 is relatively large genus of wolf spiders with 28 named species and one subspecies (World Spider Catalog 2016) distributed in the Holarctic, though the majority of its species (24) is known from Russia. Although the genus is well studied due to several revisions (Marusik et al. 2004; Marusik & Omelko 2011; Omelko et al. 2016), its real species diversity remains unknown. A recent study of the collections of the Zoological Museum of Moscow State University revealed one undescribed species from Khabarovsk Province of Russia, belonging to the A. baltoroi-group of species. The main goals of this publications are the description of this new species and the proposition of an identification key to males of the A. baltoroi-group.

Redescription of two Ctenidae (Araneae) from Taiwan.

Two ctenid species, Anahita maolan Zhu, Chen & Song, 1999 and Ctenus yaeyamensis Yoshida, 1998 from Taiwan are redescribed in detail based on both sexes. Anahita maolan is reported from Taiwan for the first time. For both species, Kenting National Park (southernmost Taiwan) is the southernmost known locality.

A new species of spider belonging to the Pardosa lugubris-group (Araneae: Lycosidae) from Far East Asia.

A new species, Pardosa koponeni sp. n., is described. The new species is widely distributed in Far East Asia. It was previously confused with P. lugubris (Walckenaer, 1802). The two species have very similar copulatory organs but differ in the colouration of legs II-IV in males and the carapace/femur I ratio in both sexes. The distribution of the new species is mapped using material examined and literature data. To provide a more complete understanding of the boundaries between such closely related species, morphological and DNA barcoding approaches for species discrimination were integrated. Two species of the Pardosa lugubris-group (P. lugubris and P. alacris) were found to share haplotypes, suggesting evidence of hybridization or incomplete lineage sorting, or they are perhaps separate morphotypes of the same species. This is another example of complexity and the value of comparing morphology and DNA barcode data among spiders.

A new species of Acantholycosa Dahl, 1908 (Araneae: Lycosidae) from the Russian Far East.

Acantholycosa Dahl, 1908 is a relatively large genus, comprising 29 species to date (World Spider Catalog 2015). The genus is well delimited; its members are recognized by having 4-6 pairs of ventral spines at leg I, a wide embolus (sometimes with a spine at its base), apical pocket(s) of epigyne separated from fovea, among other characters (cf. Marusik et al. 2004, 2015). Acantholycosa is the among the better known genera of Holarctic Lycosidae due to several revisions and reviews (Kronestedt & Marusik 2002; Marusik et al. 2004, 2015; Marusik & Logunov 2011; Marusik & Omelko 2011). Most Acantholycosa are known from the Altai-Sayan mountain system (21 species, of which 17 are local endemics) and the Maritime Province of Russia (6 species, three are local endemics). Although the Russian Far East is well studied, an expedition to the previously unstudied Phalaza Mt. in the south part of Maritime Province revealed a new species closely related to A. azarkinae Marusik & Omelko, 2011. The main goal of this paper is to provide detailed description of this new species.

Redescription of Draposa subhadrae (Patel & Reddy, 1993) (Araneae: Lycosidae, Pardosinae).

Draposa Kronestedt, 2010 is a small genus of Pardosinae spiders. Currently it encompasses 10 species (World Spider Catalog 2016) distributed from Pakistan to Southeast China. Most species of the genus, except for D. porpaensis (Gajbe, 2004), are known from both sexes and were described or redescribed by Kronestedt (2010). Two other species, D. amkhasensis (Tikader & Malhotra, 1976) and D. burasantiensis (Tikader & Malhotra, 1976), both recently transferred to Draposa (Dhali et al. 2012 ), are doubtful because their copulatory organs are not properly illustrated and differ from the type species and other species of the genus. The male of Draposa subhadrae (Patel & Reddy, 1993) remains known by very poor original drawings because Kronestedt (2010) was not able to study types. While studying material from Sri Lanka collected by us, we found one sample with two females belonging to D. subhadrae and two males of Draposa having the same colour pattern and size. We concluded that these specimens are conspecific. The goal of this paper is to provide an illustrated redescription of this species.

Redescription of Phrurolithus flavipes (Araneae: Phrurolithidae), with the first description of the male.

Phrurolithus C.L. Koch, 1839, with 71 named species, is the largest genus of the family Phrurolithidae, which contains 188 species belonging to 14 genera (Platnick 2014). It has an almost exclusively Holarctic distribution: 34 species are known from the Palaearctic, 35 are known from the Nearctic and two species are known from Hispaniola. The genus is rather poorly studied and has never been the subject of wide-scale revision. Almost half of its species are known from a single sex: 23 from females and nine from males. Additionally, 45 species are known from the original description only, and one species has never been illustrated (Platnick 2014).

A survey of East Palaearctic Lycosidae (Araneae). 11. Two new genera from the Acantholycosa complex.

Two new genera of wolf spiders belonging to Pardosinae, Gulocosa gen. n. and Melecosa gen. n., are erected to accommodate Gulocosa eskovi sp. n. (♂ ♀, Khabarovsk Province, Russia) and Sibirocosa alpina Marusik, Azarkina & Koponen, 2004, respectively. A new combination was also established: Melecosa alpina (Marusik, Azarkina & Koponen, 2004) comb. n. (ex. Sibirocosa). Polytomous and dichotomous keys are provided for the Palearctic Pardosinae genera.

A redescription of the ant mimicking spider Myrmecium gounellei (Araneae: Corinnidae, Castianeirinae), with notes on the genus.

Myrmecium Latreille, 1824 is a relatively large genus of Castianeirinae with 16 species, distributed exclusively in the Neotropics (WSC 2015). Although this genus is rather well known as a good example of ant mimicking spiders, its taxonomy is very poorly studied. Two of its species are described based on unknown sex; one species is described based on a juvenile; eight species are known based on a single sex: for seven, only females are known, and for one, only a male is known (Platnick 2014). Eleven species are known from a single record, and two species were never illustrated. The latest taxonomic paper dealing with Myrmecium was published more than 60 years ago by Camargo (1953). Although both sexes are known for six species of Myrmecium, the male palp and female epigyne are illustrated for three species only. The male palp is relatively well illustrated for the type species of the genus, M. rufum Latreille, 1824 (Camargo 1953). Somatic characters are illustrated also only for M. rufum (Simon 1897).