First records and three new species of the family Symphytognathidae (Arachnida, Araneae) from Thailand, and the circumscription of the genus Crassignatha Wunderlich, 1995 Author Rivera-Quiroz, Francisco Andres https://orcid.org/0000-0001-8748-4930 Department of Terrestrial Zoology, Understanding Evolution group, Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands & Institute for Biology Leiden (IBL), Leiden University, Sylviusweg 72, 2333 BE Leiden, the Netherlands andres.riveraquiroz@naturalis.nl Author Petcharad, Booppa Institute for Biology Leiden (IBL), Leiden University, Sylviusweg 72, 2333 BE Leiden, the Netherlands Author Miller, Jeremy A. https://orcid.org/0000-0001-8918-9775 Department of Terrestrial Zoology, Understanding Evolution group, Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands text ZooKeys 2021 2021-01-26 1012 21 53 http://dx.doi.org/10.3897/zookeys.1012.57047 journal article http://dx.doi.org/10.3897/zookeys.1012.57047 1313-2970-1012-21 4B5ACAB053224893BC53B4A48F8DC20C 1AC67CC9000A5FCF86DECCE264464FD8 Crassignatha seeliam sp. nov. Figures 4a-c , 5b, d , 6a, b , 10 , 11 , 12 Material examined. Holotype : Thailand • ♂: Chiang Mai, Doi Inthanon National Park. Montane evergreen forest; 18°30.454'N , 98°30.584'E . 1605 m; July 21-24, 2018; Booppa Petcharad, Jeremy Miller, F. Andres Rivera-Quiroz leg.; direct hand coll.; RMNH.ARA.18444. Paratypes : Thailand • ♀ allotype; same data as holotype • 8 ♀; same data as holotype; RMNH.5106641• ♂ and ♀ Chiang Mai, Doi Suthep National Park. Montane evergreen forest with pine; 18°48.502'N , 98°53.528'E . 1409 m; July 24-28, 2018; same collectors as holotype; pitfall traps. RMNH.ARA.18445. Etymology. The species epithet is a derivation of the Thai seeliam (square), in reference to the shape of the abdomen in dorsal view. Diagnosis. Distinguished from other Crassignatha species except Crassignatha quadriventris (Lin & Li, 2009) by the semi-squared posterior of the abdomen in dorsal view (Figs 10b , 11b ). Female can be separated from C. quadriventris by the coiling of the copulatory ducts in the epigynum (compare Figs 11d and 12c, d to Lin and Li 2009 : fig. 10). Male differs on the size of tegular sclerites and the cymbial tooth being short and stout instead of hook-shaped (compare Figs 10c, d and 12a, b to Lin and Li 2009 : fig. 8). Figure 10. Crassignatha seeliam sp. nov., male: Habitus: a ventral view b dorsal view. Palp: c ventral view d retrolateral view. Prosoma: e anterior view. Scale bars: 0.3 mm ( a, b ); 0.15 mm ( c-e ). Arrow pointing at the cymbial tooth. Description. Carapace coloration orange-brown covered by small tubercles (Figs 6a, b , 10a, b , 11a, b ). Legs same color, slightly darker on distal portion its segments. Male Tibia II with two spines (mating claspers) (Fig. 5d ). Abdomen black with light red patches; squared posteriorly, with sparse sclerotized patches, some bearing long setae (Figs 10b , 11b ). Male with posterior scutum wrapping the abdomen. Male palp: slightly less sclerotized than carapace. Semicircular from ventral view (Figs 10c , 12a ). Cymbium with distal tooth. Median apophysis as big as Ct (Fig. 12a ). Embolus filiform, exposed when palp is expanded (Fig. 12c ). Spermatic duct very long and coiling 2 x inside the bulb (Fig. 4b, c ). Figure 11. Crassignatha seeliam sp. nov. female: Habitus: a ventral view b dorsal view. Epigynum: c ventral view d dorsal view, cleared. Scale bars: 0.4 mm ( a, b ); 0.15 mm ( c ); 0.07 mm ( d ). Figure 12. Crassignatha seeliam sp. nov., genitalia. Palp: a ventral view b dorsal view. Epigynum, cleared: c dorsal view d ventral view. Scale bars: 0.1 mm ( a, b ); 0.07 mm ( c, d ). Vulva : Epigynum with wide scape directed ventrally, heavily sclerotized at the tip (Fig. 11c ). Copulatory opening at the tip of scape (Figs 11d , 12c, d ). Spermathecae spherical, slightly more sclerotized than epigynum, separated by ca. 2 x their diameter (Fig. 11d ). Copulatory ducts very long, coiling over themselves before connecting to S. Fertilization ducts as long as S width, projecting dorsally (figs 11d , 12c ). Male : Total length 0.68; carapace 0.36 long, 0.30 wide; clypeus 0.13; Chelicera 0.1 long, 0.07 wide; Leg I: femur 0.28, patella 0.12, tibia 0.37, metatarsus 0.17, tarsus 0.22; leg formula I-II-IV-III; abdomen 0.42 long, 0.38 wide. Female : Total length 0.69, carapace 0.44 long, 0.39 wide; clypeus 0.12; Chelicera 0.15 long, 0.1 wide; Leg I: femur 0.42, patella 0.15, tibia 0.53, metatarsus 0.22, tarsus 0.27; leg formula I-II-IV-III abdomen 0.44 long, 0.43 wide.