A taxonomic review of the mygalomorph spider genus Linothele Karsch, 1879 (Araneae, Dipluridae) Author Drolshagen, Bastian Kolberger Strasse 12 F, 76139 Karlsruhe (Germany) bdrolshagen @ gmail. com bdrolshagen@gmail.com Author Bäckstam, Christian M. Swedish Museum of Natural History, Department of Zoology, Box 50007, 104 05 Stockholm (Sweden) christian. backstam @ nrm. se backstam@nrm.se text Zoosystema 2021 2021-04-20 43 10 163 196 journal article 7176 10.5252/zoosystema2021v43a10 120db7ca-e885-4d5e-bc3d-83af0671f8d1 1638-9387 4720674 urn:lsid:zoobank.org:pub:2763DA07-4D8F-4CA2-BB63-E5BC26470296 Linothele spinosa n. sp. ( Figs 15 ; 17 K-M; 19 F) urn:lsid:zoobank.org:act: B9735F95-4D4F-46E2-9CDE-7F9CF1DAA503 TYPE MATERIAL. — Holotype . Peru • ♂ F1; near Iquitos ; 2007; H. W. Auer leg.; NHRS-KASI000000036 . Paratypes . Peru • 1 ♀ *, 2 ♀ F1; same data as for holotype; NHRS-KASI000000037 . ETYMOLOGY. — The specific epithet is a Latin adjective, meaning ‘spined’ and refers to the presence of preening-combs on ventrodistal posterior metatarsi, otherwise only observed in L. macrothelifera ; the gender is feminine. FIG. 15. — Linothele spinosa n. sp. : A -D , L. spinosa n. sp. male holotype (NHRS-KASI 000000036); E -H , L. spinosa n. sp. female paratypes (NHRS-KASI 000000037); A , left palp, prolateral view; B , left palp, retrolateral view; C , right tibia I and metatarsus I, ventral view; D , right tibia I and metatarsus I, retrolateral view; E , spinnerets, ventral view; F , maxillae, labium and sternum, ventral view; G , spermatheca, dorsal view; H , eye tubercle, dorsal view. Scale bars: 1 mm. TYPE LOCALITY. — Iquitos, Peru . DISTRIBUTION. — Only known from the type locality. DIAGNOSIS. — The male of L. spinosa n. sp. can be distinguished from those of other species of Linothele by the MP [(IML*100)/ MAD = 416], being low and domed ( Fig. 15C, D ), as well as their proportionally long [(PL*100)/BD = 385] embolus bearing no keels ( Fig. 15A, B ). Females differ from those of most other species of Linothele by the presence of preening-combs and can further be distinguished from those of L. macrothelifera by their longer spermathecae stalks bearing an elongated vesicle ( Fig. 15G ) and their distribution. DESCRIPTION Male ( holotype ) CL = 8.6. CT = 12. MC = 50-51. Colouration in alcohol: Prosoma, chelicerae, legs and pedipalps pale, yellow; opisthosoma (length: 12.04) with distinct pattern, mid-dorsally consisting of quadrate spots anteriorly, which become more rectangular posteriorly, or can be interconnected, forming longitudinal lines, laterally with several spots, ventrally with longitudinal lines and spots ( Fig. 17K, L ); maculae absent. Clypeus narrow. Palp measurements: 15.3 (5.6, 3.1, 4.8, 1.8). Leg measurements: I: 39.8 (9.7, 5.1, 8.8, 8.6, 7.6); II: 36.9 (9.0, 4.3, 7.9, 8.5, 7.2); III: 35.1 (8.4, 3.8, 7.2, 9.7, 6.0); IV: 43.9 (10.5, 4.2, 8.9, 12.9, 7.4). Leg formula 4123. Leg tarsi pseudo-segmented. Spinnerets: PMS: 1.43; PLS: apical segment broken off. Palpal organ: [(PL*100)/BD = 385], see Figure 15A, B . Megaspine and MP: [(IML*100)/MAD = 416], see Figure 15C, D . Female Colouration as for male, but prosoma, chelicerae, legs, and pedipalps light brown and dorsal pattern on opisthosoma more distinct ( Fig. 17M ). Colouration alive ( Fig. 19F ): Carapace covered with golden setae. Clypeus: narrow, see Figure 15H . Sternum, labium and maxillae: see Figure 15F . Leg formula: 4123. Scopula divided. Preening-combs present. Leg tarsi pseudo-segmented. Spinnerets: apical segment of the PLS rigid, see Figure 15E . Spermathecae: consisting of two apically elongated stalks with thin bases, bearing several short and an elongated vesicle at 1:2–1:3B, see Figure 15G . Varibility CL = 8.3-10.8. CT = 11-14. MC = 40-72. Palp measurements: 15.0-20.0 (5.0-6.3, 2.7-3.6, 3.7-5.2, 3.6-4.9). Leg measurements: I: 34.0-36.1 (8.9-9.6, 5.1-5.3, 8.0-8.5, 7.0-7.6, 5.0- 5.1); II: 26.0-34.1 (7.0-9.1, 3.8-5.2, 5.7-7.7, 5.5-7.1, 4.0-5.0); III: 24.5-32.9 (6.2-8.5, 3.0-4.4, 5.3-6.8, 6.4-8.4, 3.6-4.8); IV: 37.9-42.1 (8.0-10.5, 4.5-9.4, 7.0-9.2, 9.1-11.6, 4.4-6.0). REMARKS The male holotype has been preserved immediately after the moult to adulthood which might have caused its very light colouration. NATURAL HISTORY Unknown.