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Comprehensive Description

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Pamphobeteus crassifemursp. nov.

(Figs 1-12, 19. Tables 1, 2)

Xenesthis sp. Lucas 1982: 351 (misidentification).

Diagnosis: - Males resemble those of P. antinous , P. grandissp. nov., P. petersi , P. ultramarinus and P. vespertinus by the broad embolus. They can be distinguished by the thickened femora, especially the 3rd pair (Fig. 5). This characteristic feature is also diagnostic for females (Fig. 8).

Material examined: - HolotypemaleIBSP8330 , Brazil : Rondônia : Samuel Hydroelectric Power Station Dam, IBSPFaunal Rescue Team of Collectors,9 Feb 1989.ParatypefemaleIBSP4945 , as for holotype but, M. Costa,10 Feb 1989.

Additional material examined: - BRAZIL : Rondônia : Porto Velho, dam of Samuel Hydroelectric Power Station,IBSP12395 , 1 female,9 Feb 1989 and 1 immature, 30 Jan 1989;IBSP12394 , 1 female,20 Dec 1998 and 1 immature, 30 Jan 1989;IBSP12396 , 1 female,9 Feb 1988 and 1 immature, 20 Dec 1988;IBSP12392 , 1 female,10 Feb 1989 and 1 immature, 30 Jan 1989;IBSP12397 , 1 female,9 Jan 1989;IBSP12393 , 1 female,10 Feb1989 and 1 immature, 9 Jan 1989;IBSP12391 , 1 female and 1 immature,10 Feb 1989;IBSP4945 , 1 female,M. Costa col., 10 Feb 1989;IBSP4946 , 1 female, 2 immatures;IBSP11132 , 1 male;IBSP10324 , 1 male,10 Feb 1989;IBSP11142 , 1 female;IBSP7025 , 1 female,M. Costa col.; IBSP8332 , 1 male,12 Dec 1988;IBSP8330 , 1 male,9 Feb 1989;IBSP10320 , 1 female,10 Feb 1989;Montenegro , IBSP10378 , 1 male,R. Bertani col., 22 Jul– 2 Aug 2002; Pimenta Bueno, Tchegau Farm,IBSP4548 , 1 female,R. S. G. Almeida col., Jun 1989;Casseterite mineration area, between Alto Candaias and Massangana,IBSP4096 , 1 female,C. Froelich ded. May 1971;Mato Grosso:Barracao Queimado, 120 km from Vilhena, BR-29 road, IBSP3633 , 1 female, Dr. H. Araujo ded., 28 Sep 1962.

Etymology: - The specific name is taken from the Latin, crassus meaning “thick” and femur, a feature of the legs of males and females of this species.

Description: Holotype male. Total length, not including chelicerae or spinnerets 57. Cephalothorax 28.81 long, 27.31 wide. Anterior eye row procurved, posterior row recurved. Eyes sizes and inter-distances: AME 0.75, ALE 0.60, PME 0.74, PLE 1.02, AME–AME 0.56, AME–ALE 0.46, AME–PME 0.42, ALE–ALE 2.26, ALE–PME 0.48, PME–PME 1.75, PME–PLE 0.21, PLE–PLE 3.05, ALE–PLE 0.66. Eye tubercle: length 3.05, width 3.71; clypeus 1.5. Fovea: deep, straight, 4.72 long. Cephalic area moderately raised. Thoracic striae conspicuous. Labium: length 3.62, width 3.73, with 72 cuspules. Maxillae: between 100-200 cuspules spread across inner edge. Sternum: length 13.55, width 9.02. Sigilla: small anterior pairs, less than one diameter from margin and larger posterior pair, more than two diameters from margin. Chelicerae: 11 teeth decreasing in size from distal area and row of small teeth on promargin. Tarsi I–IV densely scopulate. Metatarsi I - II fully scopulate; III 1/2 densely scopulate; IV 1/3 densely scopulate. All femora thickened, mainly 3rd pair (Fig. 5). Spination: femora and patellae I–IV and palp 0; tibiae palp v0 –0– 1, p0 –1– 0; I 0, II v0 –1– 2(ap), p1 –0– 0; III v0 –1– 2(ap), IV v0 –1– 0; metatarsi I 0, II v1–0– 0, III v0 –2– 3 (2 ap), r0 –0– 1, IV v11 (2ap), p2 –0– 1. Spiniform setae on prolateral coxae I, retro- and prolateral coxae II–III , retrolateral coxae IV; prolateral/dorsal trochantera I, prolateral/dorsal and retrolateral/dorsal trochantera II–III , retrolateral trochantera IV (Figs 9-12). STC with small teeth. PLS articles length: apical 6.28, medial 4.04 and basal 4.72. PMS rounded, small. Urticating hair types I and III present. Cephalothorax and abdomen dark brown with red-brown hairs. Femora, patellae and tibiae with conspicuous stripes. Slight purple sheen on femora. Tibial apophysis with retrolateral process longer than prolateral (Fig. 4). Metatarsus I folds between the two processes. Male palpal bulb strongly flattened laterally, spoon-like shaped (Figs. 1-3). Prolateral superior keel well-developed, prolateral inferior weakly developed. Apical keel extended ventrally to middle of embolus. Retrolateral keel short, reaching less than 0.25 of embolus length, strongly developed forming crest distally.

FIGURES 1-6. Pamphobeteus crassifemur sp. nov.. 1- 5 Maleholotype . 1-3. Palpal bulb. 1, retrolateral, 2, prolateral, 3, dorsal. 4, Tibial apophysis , ventral. 5, Leg. III, dorsal. (6) Female paratype , spermathecae.

FIGURES 7-8. Pamphobeteus crassifemur sp. nov.. 7, Male. 8, Female. Photos: R. Bertani.

FIGURES 9-12. Pamphobeteus crassifemur sp. nov.. Stridulatory setae. 9, Coxa IV, prolateral. 10, Trochanter IV, prolateral. 11, Coxa III, retrolateral, 12, Same, detail. Arrows show spiniform setae.

TABLE 1. Pamphobeteus crassifemur sp. nov.. Male holotype . Length of left legs and palpal segments.

- Palp I II III IV
Tarsus 7.02 14.25 13.63 13.30 14.27
Metatarsus ––– 22.07 21.27 23.44 30.39
Tibia 14.52 17.94 18.51 17.48 20.95
Patella 9.82 13.14 12.62 13.25 13.48
Femur 16.20 25.39 23.62 22.46 26.01

TABLE 2. Pamphobeteus crassifemursp. nov. Female paratype . Length of left legs and palpal segments.

- Palp I II III IV
Tarsus 12.86 12.16 11.17 11.02 12.07
Metatarsus ––– 17.18 17.35 19.79 26.80
Tibia 10.92 16.71 15.51 15.75 19.39
Patella 8.42 12.46 12.46 12.17 12.29
Femur 14.04 22.72 20.63 19.05 24.30

Description: - Paratype . Female. IBSP 4945. Total length, not including chelicerae or spinnerets 66. Cephalothorax 30.87 long, 28.98 wide. Anterior eye row procurved, posterior row recurved. Eyes sizes and inter-distances: AME 0.73, ALE 0.72, PME 0.85, PLE 1.12, AME–AME 0.73, AME–ALE 0.65, AME–PME 0.21, ALE–ALE 2.49, ALE–PME 0.62, PME–PME 1.89, PME–PLE 0.24, PLE–PLE 3.18, ALE–PLE 0.67. Eye tubercle: length 3.23 width 4.07; clypeus 2.12. Fovea: deep, straight, 5.55 wide. Cephalic area moderately raised. Thoracic striae conspicuous. Labium: length 4.99, width 4.43, at least 145 cuspules. Maxillae: 100- 200 cuspules spread across internal edge. Sternum: length 13.14, width 10.31. Sigilla: posterior, small, more than two diameters from margin. Chelicerae: eight well-developed teeth and row of small teeth on promargin. Tarsi I–IV fully scopulate. Metatarsi I–IV fully scopulate, metatarsi III–IV scopulate on apical half. Spination: femora I–IV and palp 0; patellae palp 0, I v0 –0– 2(ap), II v0 –0– 2(ap), III and IV 0; tibiae palp v0 –4– 3(2 ap), I v0 –0– 2(ap), II v0 –0– 2(ap), III v0 –1– 3(ap), IV v0 –0– 1(ap); metatarsi I v0 –0– 2(ap), II v1–0– 2(ap), III v3 –3– 3(ap), r1 –0– 0, p1 –0– 0, IV 19(2 ap). Spiniform setae and STC as in male. PLS articles length: apical 6.02, medial 5.0 and basal 4.12. PMS rounded, small. Urticating hair types I and III present. Color pattern as in male, except for absence of purple sheen. Two spermathecae broadly fused (Fig. 6).

Distribution: Brazil: states of Rondônia and Western Mato Grosso (Fig. 19).

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