Dibolostethus sicarius Hoffman, 2009 Figs 3A, E, 4A–B, 5, 8–9 Dibolostethus sicarius Hoffman, 2009: 151, figs 1–11. Diagnosis Adult males of D. sicarius differ from those of D. kattani sp. nov. based on the lack of short, blunt projections on the sternite of the 5 th body ring, and from D. inopinatus sp. nov. and D. kattani sp. nov. based on the following combination of gonopodal characteristics: solenomere relatively straight until gently curving dorsally at apex, tip sinuous (Fig. 5A); prefemoral process slightly wider basally, expanded at midpoint and recurved, forming a cup-shaped depression before apex; apex with three lamellate flanges, best seen in anterior view (Fig. 5B). Type material Holotype ECUADOR • ♂; Los Rios Province [originally reported incorrectly as Pichinchi Province], Rio Palenque Science Center; [0.588° N, 79.362° W]; 21 Mar. 1977; J. Reiskind leg.; VMNH110810. Paratypes ECUADOR • 2 ♀♀; same collection data as for holotype; VMNH110811, VMNH110812. Description Male (holotype, VMNH110810) With characteristics typical for the genus. Coloration (preserved in 70% isopropanol): body rings light brown to caramel; antennae and head light yellow; legs light yellow; telson reddish, with posterior margin (= spinnerets region) yellowish. Head: epicranial macrosetae 2+2, interantennal macrosetae 1+1, frontal macrosetae 2+2. Sternites: 4 th body ring with two thin, blade-like acute projections, tips separated throughout, nearly translucent (Fig. 4A–B). Gonopod aperture on 7 th body ring oval, rim notably projecting above sternite (0.35 mm), with a deep U-shaped concavity (0.2 mm) on posterior margin. GONOPODS (Fig. 5). Gonocoxae rounded, equivalent to about three quarters the length of the telopodite; dorsum of left and right gonocoxa with 2 and 3 (possible aberration) macrosetae, respectively. Solenomere long, slender, unbranched, apex falciform and partially enveloped by prefemoral process (Fig. 5, S). Prefemoral process: long (similar in length to solenomere), width subequal to solenomere, widening at halfway point with a medial knob before curving laterad into a cup-like structure; apex broad, with a series of lamellate flanges resembling a hammerhead shark in lateral view (Fig. 5, PfP). BODY MEASUREMENTS (mm). Total length 24.8, width of 10 th body segment 1.98. Antennomere lengths (1–7): 0.38, 0.75, 0.85, 0.85, 0.85, 0.85, 0.25. Collum: length 0.5, width 1.4. Podomere lengths of 10 th body ring (1–7): 0.28, 0.55, 0.9, 0.34, 0.53, 0.95, 0.09. Gonopod aperture: length 0.50, width 0.78. Gonopod: length 0.99, width 0.86. Gonocoxae: length 0.63, width 0.36. Telopodite: length 0.98, width 0.31. Telson length 0.78. Female (paratype, VMNH110811) Coloration (preserved in 70% isopropanol) as in male. Body larger and more robust than male. Similar to male in general body outline and somatic characters, except sternite of 4 th body ring without pair of acute projections, 4 th, 5 th, and 6 th podosterna elevated to a lesser degree, 4 th and 5 th pair of legs not modified, and tibia lacking acute ventro-apical projections. BODY MEASUREMENTS (mm). Total length 30.95, width of 10 th body segment 2.6. Antennomere lengths (1–7): 0.38, 0.9, 0.93, 0.88, 0.85, 0.83, 0.23. Collum: length 1.0, width 1.7. Podomere lengths of 10 th body ring (1–7): 0.3, 0.53, 0.9, 0.38, 0.45, 0.98, 0.09. Vulvar aperture width 0.56. Posterior margin of vulvar rim: well sclerotized, U-shaped; width 0.13. Vulvae: small, unmodified, setose (Fig. 8); length 0.45, width 0.29. Valves symmetrical. External valve: lateral length 0.5, lateral height 0.44; dorsal length 0.39, dorsal width at midpoint 0.14. Operculum: length 0.06, width 0.21. Telson length 1.15. Distribution Herein restricted to the Los Rios Province, Ecuador (Fig. 9).

Published as part of Means, Jackson C., Bouzan, Rodrigo S., Iniesta, Luiz Felipe Moretti, Martínez-Torres, Daniela, Vasquez-Valverde, Luisa F., Brescovit, Antonio D. & Ivanov, Kaloyan, 2023, A review of the previously monotypic tribe Dibolostethini (Chelodesmidae: Chelodesminae) with description of two new species and a summary of the Chelodesmidae of the Tropical Andes Biodiversity Hotspot, pp. 65-85 in European Journal of Taxonomy 885 (1) on pages 71-74, DOI: 10.5852/ejt.2023.885.2189, http://zenodo.org/record/8205500