Cuiambuca vacabrava, Rheims, 2023

Rheims, Cristina A., 2023, Cuiambuca gen. nov., a new genus of Sparianthinae spiders (Araneae: Sparassidae) from Brazil, European Journal of Taxonomy 856, pp. 152-169 : 163-167

Cuiambuca vacabrava sp. nov.

urn:lsid:zoobank.org:act:1B435816-7A2C-4641-9C18-6C853670574C

Figs 1 , 2 A−C, 8−10

Diagnosis

Males of C. vacabrava sp. nov. are distinguished from those of C. aratangi sp. nov. ( Fig. 5 A−E) by the palps with RTA with dorsal branch truncated without projections ( Fig. 10 B−C) (dorsal branch bearing two long and pointed projections in C. aratangi sp. nov.) and E base wide and laminar base, lacking secondary TBE ( Fig. 10 D−E) (E base slender and secondary TBE present in C. aratangi sp. nov.). Females resemble C. aratangi sp. nov. ( Fig. 5 F−H) by the epigyne with anteriorly rounded MS but are distinguished from the latter species by the LL bearing triangular posterior projections ( Fig. 10F ) and by the vulva with BP medially twisted ( Fig. 10 G−H) (LL lacking posterior projections and BP medially bent at a 90° angle in C. aratangi sp. nov.).

Etymology

The specific name refers to the Sítio Vaca Brava, in which the Mata do Pau Ferro is located; noun in apposition.

Material examined

Holotype BRAZIL • ♂; Sergipe State, Areia, Reserva da Mata do Pau Ferro ; [06°57ʹS, 35°43ʹ58″ W]; 23−29 Sep. 1999; Equipe Biota leg.; IBSP 60013 .

Paratypes BRAZIL • 1 ♀; Sergipe State, Areia, Reserva da Mata do Pau Ferro ; [06°57ʹ S, 35°43ʹ58″ W]; 23−29 Sep. 1999; Equipe Biota; Equipe Biota leg.; IBSP 60015 • 1 ♀; Itabaiana, Estação Ecológica da Serra de Itabaiana ; (10°40ʹ S, 37°25ʹ W); 14−20 Sep. 1999; A.D. Brescovit et al. leg.; IBSP 43277 .

Description

Male (holotype)

COLOR. Prosoma brown, slightly darker along lateral margins of cephalic region, along fovea and thoracic striae; eye borders black. Chelicerae brown. Legs and palps pale brown. Labium brown, distally pale brown. Endites pale brown, distally cream colored. Sternum cream colored with pale brown margins. Opisthosoma cream colored; dorsally with brown pattern of irregular marks medially on anterior half and elongated marks laterall and on posterior half; ventrally with two almost parallel lines of muscle impressions. Spinnerets cream colored ( Fig. 8 A−B).

MEASUREMENTS. Total length 6.0, prosoma length 3.0, width 2.5, opisthosoma length 2.9, width 1.8. Eye diameters: 0.24, 0.19, 0.15, 0.18, interdistances: 0.14, 0.05, 0.26, 0.25, 0.10, 0.05. Legs (4123): I: 10.7 (3.1, 1.4, 2.8, 2.6, 0.8), II: 10.6 (3.1, 1.5, 2.7, 2.5, 0.8), III: 8.0 (2.5, 0.8, 2.0, 2.1, 0.6), IV: 10.8 (3.1, 1.1, 2.5, 3.1, 1.0).

PALP. RTA with ventral branch bifid, bearing two laminar, triangular projections; tegulum with hyaline keel arising close to C base; tp arising close to MA, roughly triangular and much smaller than MA ( Figs 8 C−E, 10A−E).

Female (IBSP 43277, paratype)

COLOR. As in male, generally darker, with opisthosoma with dorsal median chevron-like marks down posterior half and ventral median faint brown V-shaped mark ( Fig. 9 A−B).

MEASUREMENTS. Total length 7.6, prosoma length 3.4, width 2.8, opisthosoma length 3.9, width 2.6. Eye diameters: 0.24, 0.20, 0.12, 0.17, interdistances: 0.23, 0.16, 0.35, 0.35, 0.15, 0.07. Legs (4123): I: 9.1 (2.8, 1.6, 2.2, 1.8, 0.7), II: 8.5 (2.6, 1.4, 2.0, 1.9, 0.6), III: 7.7 (2.5, 1.3, 1.5, 1.8, 0.6), IV: 9.8 (2.9, 1.1, 2.3, 2.6, 0.9).

EPIGYNE. EF wider than long, with wide, irregular-shaped MAB antero-laterally; MS widest anteriorly, reaching ⅓ EF length ( Figs 9C , 10F ).

VULVA. BP longer than SP with anterior margin not surpassing half SP length; FD laterad, apically mediad ( Figs 9D , 10 G−H).

Variation

Two females: total length 7.6−8.6, prosoma length 3.4−3.5, femur I length 2.7−2.8.

Distribution

Known from the states of Paraíba and Sergipe in northeastern Brazil ( Fig. 11 )

Figures

Fig. 1. Cuiambuca vacabrava sp. nov. A−B, D. Paratype, ♀ (IBSP 60015). C. Holotype, ♂ (IBSP 60013). A. Chelicerae, right, ventral view. B. Serrula, right, ventral view. C. Leg I, metatarsus, trilobate membrane, dorsal view (median hook not visible). D. Palp, right, retrolateral view.

Fig. 2. A−C. Cuiambuca vacabrava sp. nov., holotype, ♂ (IBSP 60013). D. Cuiambuca aratangi sp. nov., holotype, ♂ (IBSP 167826) A. Leg I, tarsus, tricobothria, dorsal view. B. Leg I, tarsus, tarsal organ. C. Leg I, tarsus, claws, prolateral view. D. Epiandrium, epiandrous spigots (arrows). Abbreviations: BB = basal bulb; DP = distal plate; PP = proximal plate.

Fig. 5. Cuiambuca aratangi sp. nov. A−E. Holotype, ♂ (IBSP 167826). F−H. Paratype, ♀ (IBSP 8907). A. Left palp, prolateral view. B. Left palp, ventral view. C. Left palp, retrolateral view. D. Right palp, bulb, ventral view. E. Right palp, detail of embolus base, prolateral view. F. Epigyne, dorsal view. G. Vulva, ventral view. H. Schematic course of internal duct system. Abbreviations: BP = blind ending projection; C = conductor; CD = copulatory duct; FD = fertilization duct; LL = lateral lobe; MA = median apophysis; MAB = muscle attachment bands; MS = median septum; RpP = retroproximal cymbial projection; RTA = retrolateral tibial projection; SP = spermathecae; ST = subtegulum; sTBE = secondary tegular projection close to embolus base; TBE = tegular projection close to embolus base; tk = tegular keel; tp = tegular protrusion; VTA = ventral tibial projection. Scale bars = 0.5 mm.

Fig. 10. Cuiambuca vacabrava sp. nov. A−C. Holotype, ♂ (IBSP 60013). D−F. Paratype, ♀ (IBSP 43277). A. Left palp, prolateral view. B. Left palp, ventral view. C. Left palp, retrolateral view. D. Right palp, bulb, ventral view. E. Right palp, detail of embolus base, prolateral view. F. Epigyne, dorsal view. G. Vulva, ventral view. H. Schematic course of internal duct system. Abbreviations: BP = blind ending projection; C = conductor; CD = copulatory duct; FD = fertilization duct; LL = lateral lobe; MA = median apophysis; MAB = muscle attachment bands; MS = median septum; RpP = retroproximal cymbial projection; RTA = retrolateral tibial projection; SP = spermathecae; ST = subtegulum; sTBE = secondary tegular projection close to embolus base; TBE = tegular projection close to embolus base; tk = tegular keel; tp = tegular protrusion; VTA = ventral tibial projection. Scale bars = 5 mm.

Fig. 8. Cuiambuca vacabrava sp. nov., holotype, ♂ (IBSP 60013). A. Habitus, dorsal view; B. Habitus, ventral view. C. Left palp, prolateral view. D. Left palp, ventral view. E. Left palp, retrolateral view. Scale bars: A−B = 2.0 mm; C−E = 0.5 mm.

Fig. 9. Cuiambuca vacabrava sp. nov., paratype, ♀ (IBSP 43277). A. Habitus, dorsal view; B. Habitus, ventral view; C. Epigyne, ventral view. D. Vulva, dorsal view. Scale lines: A−B = 2.0 mm; C−D = 0.5 mm.

Fig. 11. Distribution map for species of the genus Cuiambuca gen. nov. (Brazil).