Cuiambuca gen. nov., a new genus of Sparianthinae spiders (Araneae: Sparassidae) from Brazil Author Rheims, Cristina A. Laboratório de Coleções Zoológicas, Instituto Butantan, Av. Vital Brasil, 1500, 05503 - 900, São Paulo, SP, Brazil. carheims@gmail.com text European Journal of Taxonomy 2023 2023-02-02 856 152 169 journal article 10.5852/ejt.2023.856.2035 036701a4-3d5b-4982-91b9-7fe1caa9e0d4 2118-9773 7625571 061D1047-17C7-4B55-95D5-E291FA9E063C Cuiambuca borborema sp. nov. urn:lsid:zoobank.org:act: D955F86C-DE62-4C14-9F93-1094905E0AB8 Figs 6−7 Diagnosis Females of C. borborema sp. nov. are distinguished from those of all congeners by the epigyne with MS anteriorly M-shaped ( Fig. 7A ) (rounded in the other species) and vulva with BP anterior to spermathecae and by the presence of a ventral sclerotized plate ( Fig. 7B ) (BP not surpassing spermathecae and sclerotized plate absent in other species). Etymology The specific name refers to the region of the Planalto de Borborema, where the Ecological Station of Murici is located; noun in apposition. Material examined Holotype BRAZIL • ♀ ; Alagoas State, Murici , Estação Ecológica de Murici ; ( 09°15ʹ S , 35°51ʹ W ); 13−22 Sep. 2003 ; Equipe Biota leg.; IBSP 60011 . Description Female ( holotype ) COLOR. Prosoma brown with thin dark brown spots extending posteriorly from behind posterior eyes and along lateral margins of cephalic region and thoracic striae. Chelicerae brown with thin darker brown longitudinal line. Legs and palps pale brown. Labium brown, distally pale brown. Endites pale brown, distally lighter. Sternum brown with darker brown margins. Opisthosoma pale gray; dorsally with dark brown pattern of median irregular shaped marks on anterior half, elongated marks laterally and median chevron-like marks down posterior half; ventrally with elongated marks laterally and median mottled brown band medially. Spinnerets pale brown, distally lighter ( Fig. 6 A−B). MEASUREMENTS. Total length 7.9, prosoma length 3.3, width 2.8, opisthosoma length 4.2, width 2.6. Eye diameters: 0.22, 0.20, 0.15, 0.20, interdistances: 0.15, 0.10, 0.30, 0.25, 0.15, 0.05. Legs (4213): I: 8.4 (2.5, 1.5, 2.0, 1.8, 0.6), II: 8.6 (2.7, 1.5, 2.0, 1.8, 0.6), III: 7.6 (2.3, 1.2, 1.7, 1.8, 0.6), IV: 9.3 (2.8, 1.1, 2.2, 2.4, 0.8). EPIGYNE. EF wider than long, widest posteriorly, with wide, irregular-shaped MAB situated anterolaterally; LL with roughly triangular posterior projections; MS longer than wide, with anterior margin reaching ⅔ EF length ( Figs 6C , 7A ). VULVA. BP slightly longer than SP, FD laterad ( Figs 6D , 7 B−C). Fig. 6. Cuiambuca borborema sp. nov. , holotype, ♀ (IBSP 60011). A . Habitus, dorsal view. B . Habitus, ventral view. C . Epigyne, ventral view. D . Vulva, dorsal view. A−B = 2.0 mm; C−D = 0.5 mm. Fig. 7. Cuiambuca borborema sp. nov. , holotype, ♀ (IBSP 60011). A . Epigyne, ventral view. B . Vulva, dorsal view. C . Schematic course of internal duct system. Abbreviations: BP = blind ending projection; FD = fertilization duct; LL = lateral lobe; MAB = muscle attachment bands; MS = median septum; SP = spermathecae. Scale bars = 0.5 mm. Distribution Only known from the type locality in the state of Alagoas , northeastern Brazil ( Fig. 11 ).