Cuiambuca aratangi, 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 : 156-161

Cuiambuca aratangi sp. nov.

urn:lsid:zoobank.org:act:6ADBAC94-5F62-46F6-9833-4A066481B59E

Figs 2D , 3−5

Diagnosis

Males of C. aratangi sp. nov. are distinguished from those of C. vacabrava sp. nov. ( Fig. 10 A−E) by the palps with RTA with dorsal branch bearing two long and pointed projections ( Fig. 5 B−C) (absent in C. vacabrava sp. nov.) and E base slender and with a secondary TBE ( Fig. 5 D−E) (E with wide and laminar base, lacking secondary TBE in C. vacabrava sp. nov.). Females resemble C. vacabrava sp. nov. ( Fig. 10 F−H) by the epigyne with anteriorly rounded MS but are distinguished from the latter species by the LL lacking posterior projections ( Fig. 5F ) and by the vulva with BP medially bent at 90° angle ( Fig. 10 G−H) (triangular projections present and BP medially twisted in C. vacabrava ).

Etymology

The specific name refers to Chã do Monte de Aratangi, name by which the city of Araçoiaba (type locality of the holotype) was known until the beginning of the 19 th century; noun in apposition.

Material examined

Holotype BRAZIL • ♂; Pernambuco State, Araçoiaba ; [07°48ʹ S, 35°04ʹ W]; 2009; A. Costa leg.; IBSP 167826 .

Paratype BRAZIL • 1 ♀; Paraíba State, São José da Mata ; [07°10ʹ59″ S, 35°55ʹ59″ W]; Sítio São Miguel; 10 Apr. 1997; A.D. Brescovit leg.; IBSP 8907 .

Description

Male (holotype)

COLOR. Prosoma brown, with thin darker brown lines extending posteriorly along lateral margins of cephalic region and behind PLE; fovea slightly darker than prosoma; eye borders black. Chelicerae brown. Legs and palps brown, slightly lighter than prosoma. Labium brown, distally pale brown. Endites pale brown, distally lighter. Sternum pale brown with slightly darker margins. Opisthosoma cream colored; dorsally with brown pattern of irregular marks at margins of cardiac mark and laterally and median long transversal marks down posterior half; ventrally with irregular marks laterally on posterior half and two median, almost parallel lines of muscle impressions. Spinnerets pale yellowish brown, distally cream colored ( Fig. 3 A−B).

MEASUREMENTS. Total length 7.7, prosoma length 3.6, width, opisthosoma length 4.0, width 2.1. Eye diameters: 0.25, 0.21, 0.17, 0.22, interdistances: 0.17, 0.05, 0.30, 0.26, 0.17, 0.05. Legs (4123): I: 12.4 (3.5, 1.7, 3.2, 3.0, 1.0), II: 12.3 (3.6, 1.7, 3.1, 3.7, 1.0).

PALP. RTA with ventral branch bifid with two laminar projections; tegulum with hyaline keel extending along distal margin from embolus to conductor base; tp arising close to MA, triangular and almost as large as MA ( Figs 3 C−E, 5A−E).

Female (paratype)

COLOR. Prosoma brown with dark brown lines extending posteriorly along lateral margins of cephalic region and posterior eyes and short brown lines; fovea brown, darker than prosoma; eye borders black.

Chelicerae brown with slightly darker longitudinal line. Legs and palps brown, lighter than prosoma. Labium, endites and sternum as in male, darker. Opisthosoma brownish gray; dorsally with indistinct dark pattern; ventrally with few scattered spots on posterior half. Spinnerets pale brown, distally lighter ( Fig. 4 A−B).

MEASUREMENTS. Total length 9.2, prosoma length 3.5, width 2.7, opisthosoma length 5.5, width 3.0. Eye diameters: 0.24, 0.21, 0.15, 0.20, interdistances: 0.20, 0.18, 0.38, 0.32, 0.17, 0.07. Legs (4123): I: 9.0 (2.7, 1.3, 2.3, 2.0, 0.7), II: 8.3 (2.5, 1.3, 2.0, 1.8, 0.7), III: 7.8 (2.4, 1.2, 1.7, 1.8, 0.7), IV: 9.1 (2.7, 1.1, 2.1, 2.3, 0.9).

EPIGYNE. EF as long as wide with wide, irregular-shaped MAB antero-laterally; MS short, not surpassing 1/ 9 EF length with mostly the same width throughout its entire length ( Figs 4C , 5F ).

VULVA. BP longer than SP with anterior margin not surpassing half SP length; FD laterad ( Figs 4D , 5 G−H).

Distribution

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

Figures

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. 3. Cuiambuca aratangi sp. nov., holotype, ♂ (IBSP 167826). 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. 4. Cuiambuca aratangi sp. nov., paratype, ♀ (IBSP 8907). A. Habitus, dorsal view. B. Habitus, ventral view. C. Epigyne, ventral view. D. Vulva, dorsal view. Scale bars = 0.5 mm.

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