Bumba paunaka, Ferretti, 2021

Ferretti, Nelson E., 2021, First record of the tarantula genus Bumba (Araneae: Theraphosidae) from Bolivia, with the description of a new species, Iheringia, Série Zoologia (e 2021025) 111, pp. 1-7 : 2-5

Bumba paunaka sp. nov.

urn:lsid:Zoobank.org:pub:1D0D4F27-CC34-45C0-B191-4CFBCC060E11

( Figs 1–22 , Tabs I, II)

Type material. Holotype ♂, BOLIVIA, Santa CruZ: San Miguel de Velasco (16°41ʼ54.96”S, 60°58’5.16”W, 493m), 21.VII.2014, L. López & G. Zalazar col. (CAI 3500) . Paratype ♀, BOLIVIA, La PaZ: San LorenZo, 12 km from Caranavi , 1-2.I.1991, Goloboff, Santisteban & Mc Hugh col. (AMNH) .

Etymology. Noun in apposition that refers to the name of the language from the Chiquitania region of Bolivia, near to the department of Santa Cruz, where this new species was found.

Diagnosis. Bumba paunaka sp. nov. resembles B. cuiaba due to the black longitudinal band on dorsal abdomen, more noticeable in male ( Figs 2, 4 , 20 ), however, it is much wider in B. paunaka sp. nov. than in B. cuiaba . In addition, the male differs from B. cuiaba by the longer and slender embolus ( Figs 7-12 ) and the subapical spine of the retrolateral branch of tibial apophysis being thinner and longer ( Fig. 6 ). Male of B. paunaka sp. nov. resembles those of B. mineiros and B. rondonia by the palpal bulb with a long and thin embolus with weakly developed keels, but it can be distinguished by the absence of a tooth on PI. Additionally, female of B. paunaka sp. nov. can be distinguished from all other species by the spermathecae with circular lobed seminal receptacles with very short necks ( Fig. 21 ).

Description, holotype male. Color in alcohol: carapace and legs brown with long golden hairs mainly on carapace margin ( Fig. 1 ). Abdomen light brown with a median dorsal wide black band ( Figs 2, 4 ). Total length 20.2. Carapace 9.1 long, 7.9 wide. Abdomen 10.3 long, 6.5 wide. Fovea deep procurved, 1.8 wide ( Fig. 1 ). Eye tubercle: 1.1 long, 1.5 wide. Clypeus narrow, 0.4. Anterior row of eyes procurve, posterior recurve ( Fig. 5 ). Eyes sizes and inter-distances: AME 0.36, ALE 0.38, PME 0.19, PLE 0.27, AME-AME 0.18, AME-ALE 0.15, PME-PME 0.67, PME-PLE 0.08, ALE-PLE 0.17. Labium: 0.7 long, 1.2 wide, with 23 cuspules ( Fig. 3 ). Sternum 3.7 long, 3.1 wide. Cheliceral furrow with 10 large teeth on promargin and a group of 12 smaller basal teeth on retromargin. Maxillae with ca. 109 cuspules on each side ( Fig. 3 ). Length of legs and palpal segments in the Tab. I. Spination: all femora and tarsi without spines. Patellae: palp 1 P; I 1 P; II 1 P; III-IV 0. Tibiae: palp 1-2 P; I 1-1-1 P, 1 V, 2-1-1 R; II 1-1-1 P, 2-1-2 V, 2-1-2 R; III 2-2-1-2 P, 2-1-2 V, 1-1-1 R; IV 2-1-2-1 P, 1-1-2 V, 1-1-1- 1-2 R. Metatarsi: I 1-1 P, 1 V; II 1-1-1 P, 1-1-1 V, 1 R; III 1-1-1-2 P, 2-2 V, 1-1-2 R; IV 1-2-1-2 P, 2-2-1-2 V. Scopulae: Tarsi I–IV densely scopulate, with lines of strong setae on longitudinal divisions increasing in wide from legs I to IV. Metatarsus I scopulate on distal half, II on distal third, III on distal fourth and IV only apical, distal fifth. Tibia I with two tibial apophysis originating from a common base, the retrolateral branch with a long and slender subapical spine and a shorter and strong spine on the inner side, and a long and strong spine on the retrolateral side of the prolateral shorter branch ( Fig. 6 ). Metatarsus of leg I flexes between both branches of tibial apophysis, touching their medial portion. Palpal tibia with ventral excavation and a slightly developed retrolateral process ( Figs. 13-15 ). Male palpal bulb with long embolus, longer than tegulum, PI and PS very weakly developed, almost inconspicuous, eXtending close together from the basal embolus to the apical end ( Figs. 7-12 ). Urticating setae type III and IV present. Spinnerets: PMS, 0.3 long; PLS, 0.4 basal, 0.3 middle, 0.5 domed distal.

Paratype female. Color in alcohol: same as in male, eXcepting the dorsal wide black band also eXtends to the lateral on proximal abdomen. ( Figs 19-20 ). Total length 25.91. Carapace 12.48 long,10.99 wide. Abdomen 13.43 long, 9.05 wide. Fovea deep slightly procurved, 2.23 wide ( Fig. 16 ). Eye tubercle:1.24 long, 1.92 wide. Clypeus narrow, 0.43. Anterior row of eyes slightly procurve, posterior recurve ( Fig. 17 ). Eyes sizes and inter-distances: AME 0.24, ALE 0.54, PME 0.25, PLE 0.46, AME-AME 0.31, AME-ALE 0.19, PME-PME 0.84, PME-PLE 0.07, ALE-PLE 0.21. Labium 1.18 long, 1.61 wide, with 149 cuspules ( Fig. 18 ). Sternum 4.99 long, 4.72 wide. Cheliceral furrow with 9 large teeth and 1 small on promargin and a group of 24 smaller basal teeth on retromargin. Maxillae with ca. 225 cuspules on each side ( Fig. 18 ). Length of legs and palpal segments in the Tab. II. Tarsi I-IV fully scopulated and complete. Tarsus IV with 5 lines of long setae. Metatarsus I fully scopulated, II 3/4 apical scopulated, III 1/2 apical scopulated, IV 1/4 apical scopulated. Spination: femora: palp and legs I-IV, 0. Patellae: palp and legs I-IV, 0. Tibiae: palp 1-1V, 2-2 R; I 1 P, 1-1V; II 1-2P, 1-2V; III 1-1-1P, 1-1V, 1-1 R; IV 2-3 V, 1-1-1 R. Metatarsi: I 3(ap)V; II 1-1V; III 1-1-1P, 2-2-2V, 1-1 R; IV 1-2 - 1 P, 1-1-1-1-3V, 1-1-1 R. Tarsi of palp and legs I-IV, 0. Spermathecae with circular lobed seminal receptacles with very short necks ( Fig. 21 ). Urticating setae type III and IV present. Spinnerets: PMS, 1.43 long; PLS, 2.03 basal, 1.84 middle, 2.56 domed distal .

Remarks. In order to assure that the specimens are conspecific, I relied on the morphological general aspect such as the body size and more importantly the coloration pattern and the presence of the dark band at dorsal abdomen, since it seems to be a diagnostic character that is present in just two species ( B. cuiaba and B. paunaka sp. nov.), which is wider in specimens of B. paunaka sp. nov. In addition, although the geographic distance that exists between the specimens eXamined is considerable (about 700 km in straight line), particularly, they both inhabit the Southwest Amazon moist forest ecorregion, which are characterized by Amazonian areas of low lands extended in the north and northeastern Bolivia and along the Andean foothills reaching Santa Cruz de la Sierra (with altitudes about 500-600 m in La Paz and Beni departments; and 300-400 in Cochabamba and Santa Cruz departments) ( OLSON et al., 2001; HERZOG et al., 2005). The paratype female presents an abnormal lateral expansion of the abdomen and under a close examination of the area, a small oval scar largely sclerotized was observed ( Fig. 19 ). This could be the result of an injury caused by the penetration of a parasitoid Acroceridae ( Diptera ) larvae into the body of the spider, which searches for the soft tissues like the abdomen or the articulations (BARNECHE et al., 2013; GABELLONE et al., 2020). Unfortunately, the impossibility to dissect the abdomen of the female due to the designation as paratype and being the only individual do not allow making a further confirmation of this observation.

Distribution. Central Bolivia, at the departments of La Paz and Santa Cruz ( Fig. 21 ).

Figures

Figs 1-6. Bumba paunaka sp. nov., holotype male: 1, carapace, dorsal view; 2, abdomen, dorsal view; 3, labium, sternum and maxillae; 4, abdomen, lateral view; 5, eyes, dorsal view; 6, tibial apophysis, proventral view; PB, prolateral branch; RB, retrolateral branch. Green arrows indicate the subapical spines on the retrolateral branch of tibial apophysis. Scale bars =1mm.

Figs 7-15. Bumba paunaka sp. nov., holotype male, bulb: 7, retrolateral view; 8, ventral view; 9, dorsal view; 10, prolateral view; 11, detail of palpal bulb embolus at prolateral view; 12, detail of palpal bulb embolus at dorsal view. Palpal tibia and cymbium: 13, ventral view (green arrow indicates the retrolateral process); 14, prolateral view; 15, retrolateral view (Cy, cymbium; PI, prolateral inferior keel; PS, prolateral superior keel; Rp, retrolateral process; Ti, tibia). Scale bars = 1 mm.

Figs 16-21. Bumba paunaka sp. nov., paratype female: 16, carapace, dorsal view; 17, eyes, dorsal view; 18, labium and maxillae. Abdomen: 19, dorsal view; 20, lateral view; 21, spermathecae, dorsal view. Green arrow indicates an oval small scar and a lateral abnormal expansion of the abdomen. Scale bars = 1 mm.

Fig. 22. Distribution map of the known species of Bumba. The green Question mark indicates the unknown precise locality of B. mineiros in Paraguay.