Idiops petiti ( Guérin, 1838 )

Gomes, João Pedro Costa, Santos, Naila Amanda Sousa dos & Almeida, Marlus Queiroz, 2024, Idiopidae in the Brazilian Amazon: Description of a new species, characterization of an unknown male and expansion of geographic records, EntomoBrasilis (e 1076) 17, pp. 1076-1076 : 2-4

Idiops petiti ( Guérin, 1838)

Figures 3 , 6

Acanthodon petitii Guérin, 1838: 163 , pl. 47 Figures 1 -8, Santarém, Pará, Brazil.

Acanthodon santaremia O. Pickard-Cambridge, 1896: 733 , pl. 34, Figure 13. First Synonymized by Fonseca-Ferreira et al. 2021: 47

Idiops crulsi Mello-Leitão, 1930: 55 , Figure 2 . Synonymized by Bücherl et al. 1971: 128.

Idiops petiti O. Pickard-Cambridge, 1870: 107 ; 1896: 732, pl. 34 Figures 9-12 (combination). - Mello-Leitão 1923: 48. - Bücherl et al. 1971: 121, Figure 5 .

Idiops petiti Fonseca-Ferreira et al. 2021: 47 , f. 26ª-L (Dm, f, S of de Idiops santaremius ).

Diagnosis: The males of I. petiti differ from other Neotropical species, except for Idiops carajas Fonseca-Ferreira et al., 2017 , by presenting spines concentrated on the basal half of the retrolateral depression of the palpal tibia, a tibial apophysis with a narrow apical branch in a rectangular shape, and the presence of a lateral lamella extending along the median portion of the embolus ( Figure 3C ). It differs from I. carajas in having the subapical portion of the embolus thin and straight ( Figure 3D ), and the metatarsus of leg I slightly curved with a small prolateral projection in the apical half ( Figure 3C ). Females are distinguished from their congeners, except I. carajas , by having spermathecae with a large trapezoidal base and ducts in a V shape (see Fonseca-Ferreira et al. 2021, Figure 26L). It differs from I. carajas by its large oval receptacles ( Fonseca-Ferreira et al. 2021).

Examined material: Brazil - ♂ ( INPA-ARA9163 ) Amazonas, Purus River, Beruri Lake,inside a clay termite mound at the base of a Brazilian nut tree, -3.8116666666667 -61.272222222222 ( Figure 6 ), 17.I.1987. N.O. Aquino Col .; ♂ ( INPA-ARA9164 ) Roraima, Amajari, Tepequem / Sesc 3.7458333333333, -61.727777777778 ( Figure 6 ), 15-31.II.2016. R. Boldrini Col .

Distribution: Amazonas, Pará, Rondônia ( Fonseca-Ferreira et al. 2021), and Roraima (new record) ( Figure 6 ).

Description ♂ (INPA-ARA9164) - Measurements: Total size 15.82; cephalothorax 7.21 in length, 6.66 in width; labium 0.96 in length, 1.1 in width; sternum 4.22 in length, 3.36 in width. Palp and legs: Palp = 10.62 (3.31, 2.32, 3.29, 1.7), I = 22.55 (7.82, 3.13, 5.78, 3.42, 2.4), II = 20.65 (6.59, 2.76, 4.95, 4.36, 1.99), III = 18.82 (5.33, 2.62, 3.59, 4.73, 2.55), IV = 26.36 (7.34, 2.99, 6.36, 6.16, 3.51); spines: Palp: Ti r14, Ta d0-0-4. I: Fe d1-1-1, Pa v0-1-4, Ti v11-19-11, p0-1-4, r4-5-6, Mt v6-10-15, p1-3-5, r0-7-3, Ta v0-2-0, p0-4-4, r4-6-4. II: Fe d1-1-1, Pa v0-0-3, Ti v4-10-15, p0-2-3, r1-3-4, Mt v6-6-8, p1-4-6, r2-5-9, Ta p1-5-3, r2-5-7. III: Fe d1-2-1, Pa p6-5-9, Ti v0-2-4, p1-2-3, r0-2-3. Mt d2- 5-2, v2-6-8, p0-5-5, r1-2-2. Ta p6-10-6, r6-10-9. IV: Fe d1-1-1, Mt v2-2-5, p0-1-3, r0-2-3, Ta p5-5-8, r5-4-8.

Figures

Figure 1. (A-F)♀ Idiops dilatatussp. nov. (INPA-ARA9162),A:Cephalothorax.B: Sternum and thighs, ventral view.C: Eye and bristle arrangement, dorsal view. D: Abdomen, dorsal view. E: Labium, chelicerae and palp in ventral view. F: Spinnerets, ventral view. Scale bar A-B: 2mm; C-F: 1mm.

Figure 2. (A-C) ♀ Idiops dilatatus sp. nov. (INPA-ARA9162), A: Left leg III, retrolateral view, fe indicates internally dilated femur III. B: Distal tarsus and tarsal claws of leg II (prolateral), arrows indicate respectively lower tarsal claw (ITC) and upper tarsal claw (STG). C: Spermatheca, ventral and dorsal views, respectively. Scale bar: 1mm.

Figure 3. (A-D) ♂ Idiops petiti (Guérin, 1838) (INPA-ARA9164), A: Cephalothorax, dorsal view. B: Sternum, ventral view. C: Leg I, tibial apophysis and curved metatarsus, dorsal view. D: Left palp, prolateral view.

Figure 5. (A-E) ♂ Neocteniza coylei (INPA-ARA9165), A: Palp with incrassate tibia and arrangement of ventral spines on the palpal tibia (VTG), prolateral view. B: Enlarged VTG spines. C, D & E: Palpal bulb, dorsal, prolateral, and ventral views, respectively. Scale bar A-B: 0.25mm; C, D and E: 1 mm.

Figure 6. New record of Idiops petiti (Guérin, 1838) and the respective localities of Idiops dilatatus sp. nov. (white circle) and Neocteniza coylei (Goloboff & Platnick, 1992) (blue circle).