Canga renatae, Dasilva, Marcio Bernardino, Pinto-Da-Rocha, Ricardo & Giribet, Gonzalo, 2010

Dasilva, Marcio Bernardino, Pinto-Da-Rocha, Ricardo & Giribet, Gonzalo, 2010, Canga renatae, a new genus and species of Cyphophthalmi from Brazilian Amazon caves (Opiliones: Neogoveidae), Zootaxa 2508, pp. 45-55 : 47-51

Canga renatae sp. nov.

Figures 2– 21

Type material: Male holotype (MZSP-31952) from Brazil, Pará State, Parauapebas (Gruta S11D40, Flona Carajás), 23.VIII.–02.IX.2007, leg. R. Andrade. Paratypes: same data as for holotype, 2 males ( MCZ DNA 104650); 1 male, 1 female ( MPEG); 3 males, 1 female (MZSP-31953); (Gruta S11D78), 23.IX.– 03.X.2007, leg. R. Andrade, 1 male, 1 female (MZSP-31954); (Gruta N1-173), 28.IX.–03.X.2007, leg. R. Andrade, 1 immature (MZSP-31955); Canaã dos Carajás (Gruta Cris33), 29.VII.–6.VIII.2008, leg. R. Andrade, 2 males, 1 female, 1 immature (MZSP-31956).

Description: Body dark brown, legs lighter in color (when preserved in ethanol) with most of dorsal and ventral surfaces and legs showing a dense tuberculate-microgranulate structure ( Murphree, 1988). Prosomal region occupying almost half of the body size ( Figs. 2, 5 , 8 ). Anterior margin of dorsal scutum with a pair of processes lateral to chelicerae. Lateral margin of prosoma bulging considerably behind ozophores, at widest part of body. Eyes and eye lenses absent ( Fig. 8 ). Ozophores of type 2 (sensu Juberthie, 1970), conical, slightly distant from the carapace margin, ozopore opening subterminally ( Fig. 10 ). Dorsal scutum without special modifications. Transverse prosomal dorsal sulcus absent ( Figs. 2, 5 , 8 ). Transverse opisthosomal dorsal sulci inconspicuous, only indicated by the lack of ornamentation towards the sides of the opisthosoma ( Fig. 8 ). Ventral prosomal complex with coxae I and II free, not fused to coxae III–IV; all leg coxae meeting along the midline; coxae IV meeting to form the anterior wall of the gonostome; gonostome semicircular with straight posterior margin ( Figs. 9 , 11 ). Each spiracle forming a closed circle, internal diameter 32 μm ( Fig. 13 ). Ventral opisthosomal region without glands or modifications ( Fig. 9 ) and without anal glands ( Fig. 12 ). Sternites 8 and 9 and tergite IX completely fused, forming a corona analis ( Fig. 12 ); tergite IX with a small posterior notch, but not associated to any gland.

Chelicerae ( Figs. 3, 6 , 20 ) relatively long and strong, with long dorsal setae, especially on proximal article; not of the protruding type (sensu Giribet, 2003). Proximal article with ectal surface granular, without a conspicuous dorsal crest and with a single ventral process. Second article fairly robust, widest near the base, lacking granules. Dentition uniform and similar on both cheliceral fingers ( Fig. 20 ).

Pedipalps ( Fig. 14 ). Trochanter slender at the base, widening at the trochantero-femoral joint; without a ventral process; with two ventral rows of dentiform tubercles. Femur cylindrical, with ventral row of few dentiform tubercles.

Legs short and robust; with claws on tarsi III and IV ( Figs. 17–18 ) smooth, on tarsi I and II with three and five teeth, respectively ( Figs. 15–16 ), long and hook-like. Surface of all leg articles, except tarsi I–IV, completely ornamented with granules. Ventral side of tarsus I without a distinct solea ( Fig. 15 ). All tarsi with a large dorsal groove for retracting the claws. Patellae, tibiae, metatarsi and tarsi of all legs without longitudinal seam on ectal side. Male tarsus IV entire ( Figs. 18–19 ), carrying a distinct lamelliform adenostyle (without median seta, base with setae, opening situated in median region) near its base. Female tarsus IV without modifications.

Spermatopositor short, 500 µm in length, with six short rigid distal microtrichia. Ventral side with two long microtrichia, shorter than the mid-piece bearing the rigid microtrichia. Dorsal side ( Fig. 21 ) complex, with the ventral plate bearing two groups of four marginal microtrichia. Fimbriate structures around gonopore.

Measurements: Male holotype (female paratype in parenthesis): total length: 1.4 (1.35) mm, greatest width: 0.8 (0.8) mm, in the posterior part of prosoma; length/width ratio: 1.75 (1.69); length of chelicerae: 1.3 (1.12) mm, palps (trochanter to tarsus): 1.22 (1.12) mm, legs (trochanter to tarsus) I: 1.92 (1.85), II: 1.62 (1.62), III: 1.37 (1.35), IV: 1.67 (1.65).

Etymology: The new species is named after our colleague and renowned speleologist Renata de Andrade, who collected in the canga caves of the Serra dos Carajás.

Distribution: Known only from four ironstone caves in the Serra de Carajás, Pará State, Brazil.

Figures

FIGURE 20. Canga renatae. Right chelicera of male and detail of fingers, prolateral view. Scales bars: 0.1 mm and 0.05 mm.

FIGURE 21. Spermatopositor of male paratype (MCZ DNA 104650), dorsal view. Scale bar = 100 µm.

FIGURES 2 – 7. Canga renatae stereomicrographs. 2 – 4. Male. 5 – 7. Female. 2, 5. Dorsal view. 3, 6. Ventral view. 4, 7. Lateral view. Scale bars: 1 mm.

FIGURES 8 – 9. Canga renatae, male, scanning electron micrographs. 1. Dorsal view. 2. Ventral view. Scale bars: 100 μm.

FIGURES 10 – 13. Canga renatae, male, scanning electron micrographs. 10. Ozophore. 11. Ventral prosomal complex. 12. Anal region. 13. Open circular stigmatic spiracle. Scale bars: 10, 13 = 10 μm; 11 = 30 μm; 12 = 20 μm.

FIGURES 14 – 19. Canga renatae, male, scanning electron micrographs. 14. Palp, retrolateral view. 15. Leg I with toothed claw. 16. Leg II with toothed claw. 17. Leg III with smooth claw. 18. Tarsus of leg IV with adenostyle and smooth claw, lateral view. 19. Tarsus IV of male with adenostyle, dorsal view. Scale bars: 14, 16, 18 = 30 μm; 15, 17, 19 = 20 μm.