Amazonius burgessi, n. comb.
Creators: name: Cifuentes, Yeimy
name: Bertani, Rogerio
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Theraphosidae
Amazonius
Amazonius burgessi

description: Amazonius burgessi (Husser, 2018) n. comb.
(Figs 19, 311, 345–352, 355–356, 362–363)
Pseudoclamoris burgessi Husser, 2018: 74, figs 4A–B, 5A–C, 6A–C.
Diagnosis. Females of Amazonius burgessi n. comb. resemble those of A. elenae n. comb. by the multilobular spermathecae (Figs 351–352). They can be distinguished by the modified short stiff setae on the ventral area of femur I (Figs 355–356). Males resemble those of A. giovaninii n. gen. n. sp. by the male palpal bulb embolus roughly straight with a slight curvature distally (Fig. 345–348). They differ by the embolus tapering from its half in dorsal view (Fig. 348).
Type material. Holotype male, paratype female from Colombia, Amazonas, Leticia (4°7’44.7”S, 69°58’42.5”W) H. W. Auer leg., 2010 (SMF 69513-84, 69514-84), examined (Figs 345–348, 352).
Other material examined. VENEZUELA: Amazonas: Puerto Ayacucho [5°39’N, 67°34’W], 2 males, R. West col., on low vegetation by creek, September 1991 (MNRJ 7714); COLOMBIA: Caquetá: Florencia [1°36’N, 75°36’W] 1 female, Sede de recreación antiguo Coafretal, F. Ortíz col. (ICN-Ar-7530); (1°30’5.39’’N, 75°39’46.26’’W), 1 female, 1 male, 2 juveniles, Centro de Investigación Amazónica (CIMAZ), Eduardo Florez and Animal Taxonomy students of Colombia National University, manual collection at night in the forest, on the ground and on tree trunk (ICN-Ar-10754).
Redescription. Female (ICN-Ar-7530). Total length, not including chelicerae or spinnerets 31.40. Carapace 16.26 long, 13.68 wide, 8.04 high. Chelicera: 8.31 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 11.95, 7.49, 9.75, 8.77, 5.21, 43.17; II: 10.92, 6.69, 8.46, 8.45, 4.85, 39.37; III: 9.92, 5.89, 7.38, 8.53, 4.84, 36.56; IV: 12.16, 6.39, 10.26, 11.29, 4.71, 44.81; Palp: 8.33, 4.90, 5.63, -, 5.44, 24.3. Midwidths: femora I–IV= 2.43, 2.74, 2.76, 2.16, palp= 2.01; patellae I–IV= 2.72, 2.38, 2.70, 2.63, palp= 2.22; tibiae I–IV= 2.32, 2.14, 2.30, 2.50, palp= 2.13; metatarsi I–IV= 2.20, 1.97, 1.77, 1.66; tarsi I–IV= 1.99, 1.92, 1.85, 1.89, palp= 1.94. Abdomen: 15.16 long, 8.35 wide. Spinnerets: PMS, 1.78 long, 0.84 wide, 0.67 apart; PLS, 2.87 basal, 1.70 middle, 2.76 distal; midwidths 2.04, 1.91, 1.52, respectively. Carapace: 1.19 times longer than wide; cephalic region slightly raised, thoracic striae conspicuous. Fovea: deep, straight, 2.01 wide. Eyes: eye tubercle 1.24 high, 2.11 long, 3.60 wide. Clipeus: absent. Anterior eye row straight, posterior slightly recurved. Eye size and interdistances: AME 0.76, ALE 0.81, PME 0.42, PLE 0.65, AME–AME 0.56, AME–ALE 0.28, AME–PME 0.30, ALE–ALE 2.61, ALE–PME 0.55, PME–PME 1.92, PME–PLE 1.18, PLE–PLE 2.75, ALE–PLE 0.29. Maxilla: length to width 1.63. Cuspules: 141 spread over ventral inner heel. Labium: 2.09 long, 2.76 wide, with ca. 195 cuspules spaced by one diameter from each other on anterior third. Chelicera: basal segment with 10 teeth in row. Strikers: Long and short filiform setae, disposed without discernible pattern on a ventral-basal portion of chelicera before the teeth row (Fig. 350). Sternum: 7.80 long, 5.95 wide.
Legs: Formula: I = IV II III. Length leg IV to leg I: 1.04. Scopula: Tarsi I–IV fully scopulate; IV with a few sparse setae. Metatarsi I–II fully scopulate; III 1/2 distal; IV 1/3 distal. IV divided by rows of setae. Femora I ventrally and laterally with short scale like setae (Figs 355–356). Spination: Palps and legs (ventral apical: tibia/metatarsi): Palp 0; I: 0/0; II 2/0; III 1/0; IV 0/2. Maxillary stridulatory organ weakly developed, composed of slightly thick setae with rugose aspect, not disposed on an ordered line, grouped forming an oval patch on the prolateral face of the maxillae (Fig. 349).
Spermathecae (Fig. 351): Two spermathecae completely separated, curved apically with an apical constriction forming lobes disposed as a crown, two striae from base to apex form a fold on ventral view.
Color pattern (preserved in alcohol): Carapace and abdomen dark brown, legs and palpal femora brown with golden setae; tibia, metatarsus and tarsus brown.
Redescription. Male holotype (SMF 69513-84). Total length, not including chelicerae or spinnerets 23.30. Carapace 10.61 long, 10.10 wide, 2.92 high. Chelicera: 3.69 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: missing on both sides; II:11.57, 5.24, 9.71, 9.80, 4.89, 41.21; III: 9.84, 4.58, 7.94, 9.05, 4.60, 36.01; IV: 12.20, 5.16, 10.70, 12.72, 4.47, 45.25; Palp: 7.71, 4.03, 6.78, -, 2.20, 20.72. Midwidths: femora II–IV (I missing) = 1.97, 2.21, 2.09, palp= 1.51; patella II–IV= 1.97, 2.01, 1.90, palp= 1.88; tibiae II–IV= 1.51, 1.51, 1.56, palp= 1.57; metatarsi II–IV= 1.07, 1.00, 1.04; tarsi II–IV= 1.06, 1.30, 1.23, palp= 1.69. Abdomen: 12.17 long, 7.94 wide. Spinnerets: PMS, 1.08 long, 0.57 wide, 0.43 apart; PLS, 2.07 basal, 1.34 middle, 2.39 distal; midwidths 0.77, 0.83, 0.65, respectively. Carapace: 1.05 times longer than wide; cephalic region slightly raised, thoracic striae conspicuous. Fovea: deep, straight, 0.80 wide. Eyes: eye tubercle 0.34 high, 1.73 long, 2.48 wide. Clipeus: absent. Anterior eye row straight, posterior slightly recurved. Eye size and interdistances: AME 0.67, ALE 0.54, PME 0.33, PLE 0.54, AME–AME 0.30, AME–ALE 0.22, AME–PME 0.13, ALE–ALE 1.72, ALE–PME 0.31, PME–PME 1.38, PME– PLE 0.13, PLE–PLE 1.81, ALE–PLE 0.20. Maxilla: length to width 2.45. Cuspules: ca. 155 spread over ventral inner heel. Labium: 1.59 long, 1.91 wide, with ca. 154 cuspules spaced by one diameter from each other on anterior third. Chelicera: basal segment with 9 teeth in row. Strikers: Long and short filiform setae, disposed without any pattern on a ventral-basal portion of chelicera before the teeth row. Sternum: 5.69 long, 4.56 wide.
Legs: Formula I = IV II III, length leg IV to leg I: 0.96 (legs I missing, but see remarks below). Scopula: Tarsi II–IV fully scopulate; IV with a few sparse setae. Metatarsi II fully scopulate; III 2/3 distal; IV 1/3 distal. IV divided by rows of setae. Spination: Palps and legs (ventral apical: tibia/metatarsi): Palp 1/-; I: missing; II: 2/0; III 0/2; IV 0/2. Maxillary stridulatory organ: weakly developed, composed of slender setae with rugose aspect, not disposed on an ordered line, grouped forming an oval patch on the prolateral face of the maxillae. Tibial apophysis: two processes, retrolateral longer than prolateral, one spine at side of prolateral, one at apical part of retrolateral process. Metatarsus I folds on retrolateral side of tibial apophysis. Both holotype’s leg I missing (see remarks below).
Palp (Figs 345–348): tegulum length 0.94, width 1.24, embolus proximal width 0.54, length 4.01. Embolus proximal portion straight. Embolus length to tegulum length: 4.36. Embolus roughly straight with a slight curvature distally, tapering from its half to its tip in dorsal view. Embolus tip roughly straight.
Color pattern (preserved in alcohol): Carapace, legs, palpal femora, and tibiae light brown. Whitish rings on distal femora, patellae, tibiae and metatarsi. Abdomen beige. Coxae, sternum, maxillae and labium light brown, a littler darker on anterior half of coxae I, II and the maxillae.
Remarks. Even though the leg I apophysis was described and illustrated in the original publication, both legs I of the holotype are missing. The information on the apophysis and legs proportions are from the original publication and the specimen ICN-Ar-10754.
Distribution. Venezuela, Colombia and Peru (Fig. 311).
description: Published as part of Cifuentes, Yeimy & Bertani, Rogerio, 2022, Taxonomic revision and cladistic analysis of the tarantula genera Tapinauchenius Ausserer, 1871, Psalmopoeus Pocock, 1985, and Amazonius n. gen. (Theraphosidae, Psalmopoeinae), pp. 1-123 in Zootaxa 5101 (1) on pages 106-111, DOI: 10.11646/zootaxa.5101.1.1, http://zenodo.org/record/6253223