Goloboffia biberi sp. nov. (Figs 10–22, 71) Type material. Holotype: ♀, MACN-Ar 36120, Chile, Región de Coquimbo (IV), Choapa, Cuesta de Cavilolén, 30 km northeast of Los Vilos, 7.xi.1988, P. Goloboff, E. Maury and C. Szumik, leg. Additional material examined. 2 ♀♀ and 2 juveniles, MACN-Ar 36120, Chile, Región de Coquimbo (IV), Choapa, Cuesta de Cavilolén, 30 km northeast of Los Vilos, 7.xi.1988, P. Goloboff, E. Maury and C. Szumik, leg. Etymology. The specific epithet is a patronym in honor of the Bohemian-Austrian composer and violinist Heinrich Ignaz Franz von Biber (1644–1704), one of the most important composers for the violin in the history of the instrument. Diagnosis. Female of Goloboffia biberi sp. nov shares with G. vellardi the shape of the spermathecae (Fig. 22), but differs from it and from the other known species of the genus by the presence of a group of short and strong setae located ventrally on the first trochanters (Figs 15–17) and by the presence of spines on tarsi IV (Figs 18–19). Description. Female holotype, MACN-Ar 36120. Coloration (in alcohol): Carapace, legs and chelicerae brown (Figs 10, 13), abdomen gray. Total length 14.23; carapace 4.76 long, 4.25 wide. Fovea deep, procurved with recurved ends, 0.47 wide. Ocular group 1.59 wide, occupying 0.65 of cephalic width (Fig. 12). Eye sizes and interdistances: AME 0.11, PME 0.18, ALE 0.44, PLE 0.18, AME–AME 0.15, AME–ALE 0.25, PLE–PME 0.10, PME–PME 0.61. Labium 0.48 long, 0.37 wide, with 7 cuspules. Labium separated from sternum by shallow groove. Maxillae with 5/6 (right/left) cuspules (Fig. 11). Fangs keeled and chelicerae with subequal teeth, 4 promarginal and 4 retromarginal, and 20 denticles between margins. Sternum elongated, 2.74 long, 2.15 wide. Posterior sigillae oval and shallow (Fig. 14). Leg formula 4123, tibiae and metatarsi I and II flattened, with very long spines (Figs 20–21). Segment lengths (femur, patella, tibia, metatarsus, tarsus, total): I: 2.55, 1.02, 1.35, 1.33, 0.63, 6.88. II: 2.6, 1.62, 1.93, 1.34, 0.58, 8.07. III: 2.11, 0.92, 1.46, 0.52, 0.50, 5.51. IV: 3.3, 1.62, 2.3, 2.8, 0.66, 10.68. Palp: 1.53, 0.9, 1.36, –, 0.81, 4.6. Spines: Femur: Palp and legs I – IV, 0. Patella: Palp: 1 – 1p; I: 1p; II: 1p; III: 28p; IV: 113d. Tibia: Palp: 2p, 1r; I: 6p, 10r; II: 4p, 9r; III: 24p; IV: 1v. Metatarsus: I: 8p, 7r; II: 6p, 6r; III: ventral comb of 13 large and 18 small spines (Figs 18–19); IV: ventral comb of 14 large and 2 small spines. Tarsus: Palp: 3p, 3r; I: 1p, 4r, 12v; II: 3p, 6r, 15v; III: 12p, 5r, 15v; IV: about 21 ventral spines mixed with long setae. Spermathecae with short and wide receptacles each distally terminated with transverse oval lobe, with short ducts wider at base of the same length as the spermathecal head width (Fig. 22). Male. Unknown. Distribution. Known only from the type locality (Fig. 71).

Published as part of Ferretti, Nelson E., Ríos-Tamayo, Duniesky & Goloboff, Pablo A., 2019, Four new species of Goloboffia (Mygalomorphae: Migidae) from Chile, pp. 251-268 in Zootaxa 4712 (2) on pages 257-258, DOI: 10.11646/zootaxa.4712.2.5, http://zenodo.org/record/3587069