Stygnoplus ianomami, Pinto-Da-Rocha, Ricardo & Tourinho, Ana Lúcia, 2012

Pinto-Da-Rocha, Ricardo & Tourinho, Ana Lúcia, 2012, Two new genera, ten new species and new records of Amazonian Stygnidae Simon, 1879 (Opiliones: Laniatores), Zootaxa 3340, pp. 1-28 : 5-6

Stygnoplus ianomami sp. nov.

( Figs. 2 A–E, 12D–F)

Diagnosis: The male of this species is similar to those of Stygnoplus clavotibialis ( Goodnight & Goodnight 1947) and S. meinerti Soerensen 1932 in the absence of large tubercles/spines on the dorsum of tibia IV. It differs from both by having a tuberculate spine on prosoma, and a straight tibia IV that is not swollen subdistally.

Type locality: Brazil, Amazonas, São Gabriel da Cachoeira (Pico da Neblina , 860 m. a.s.l.).

Type material: All material was collected in Brazil, Amazonas, São Gabriel da Cachoeira (Pico da Neblina ). Holotype 860 m. a.s.l., 29.X.2007, A. Nogueira leg. (INPA-OP 934). Paratypes: 860 m. a.s.l., 29.IX.2007, A. Nogueira leg., 3 males (INPA-OP 935); 860 m. a.s.l., 29.IX.2007, A. Nogueira leg., male (INPA-OP 937); 860 m. a.s.l., 29.IX.2007, A. Nogueira leg., 2 males (INPA-OP 938); 860 m. a.s.l., 30.IX.2007, A. Nogueira leg., female (INPA-OP 939); 860m, 28.IX.2007, D. Candiani leg., 3 males (MZSP-36572); 860 m. a.s.l., 29.IX.2007, A. Nogueira leg., 2 males, female (INPA-OP 940); 860 m. a.s.l., 29.IX.2007, D. Candiani leg., male, female (MZSP- 36524); 860 m. a.s.l., 29.IX.2007, D. Candiani leg., male, 2 females (MZSP-36526); 860 m. a.s.l., 29.IX.2007, D. Candiani leg., female (INPA-OP 941); idem, 860 m. a.s.l., female (INPA-OP 943); 860 m. a.s.l., 28.IX.2007, N. Lo Man Hung leg., 2 males, 2 females (INPA-OP 946); 860 m. a.s.l., 29.IX.2007, N. Lo Man Hung leg., female (MZSP-36532); 860 m. a.s.l., 29.IX.2007, N. Lo Man Hung leg., male, 3 females (INPA-OP 947); 860 m. a.s.l., 29.IX.2007, N. Lo Man Hung leg., 2 males, 2 females (INPA-OP 1012); 860 m. a.s.l., 30.IX.2007, A. Nogueira leg., female (INPA-OP 1013); 860 m. a.s.l., 30.IX.2007, N. Lo Man Hung leg., male (INPA-OP 1014); 1,550 m.a.s.l., 3.X.2007, N. Lo Man Hung leg., male, female (INPA-OP 1015); 2,000 m.a.s.l., X.2007, Nogueira, Hung & Candiani leg., male (MZSP-36530).

Etymology: Ianomami is the name of the tribe that lives in the northern region of Brazilian Amazonia and Southern Venezuelan Amazonia, encompassing the type locality of S. ianomami .

Male description (holotype): Measurements: DSL 3.5; PL 1.7; DSW 3.2; PW 3.1; ID 1.9; chelicera II 3.7; III 1.6; pedipalpus 6.8; leg I 13.3; II 25.3; III 16.5; IV 22. 3.

Dorsum ( Fig. 2 A–B): Anterior margin with three–four tubercles each side (one larger). Prosoma with one large spine slightly frontwards, with tuberculate base, one tubercle close each eye mound. Lateral margin with one row of tubercles from coxa II to groove IV. Area I with three–five tubercles each side; II with five each side; III with two divergent spines backwards, with tuberculate base, one tubercle behind and three on side of each spine. Posterior margin with a row of eight tubercles. Free tergite I with six tubercles; II–III with six tubercles. Anal operculum with one anterior row of small tubercles, some scattered.

Venter: Coxa I with six large tubercles in a median row, two anterior, one posterior, two apical; II with one median row of six tubercles, two anterior, five posterior, four apical tubercles; III with five scattered tubercles, four apical; IV irregularly tuberculate. Posterior margin with one row of small tubercles, some scattered. Anal operculum with small scattered tubercles.

Chelicera: Segment I with four tubercles on bulla; II one large basal tubercle, four small distal; III two large basal, two small distal. With interchelar space.

Pedipalpus: Coxa with four ventral tubercles (apical larger), two dorsal tubercles. Trochanter with two ventral tubercles (one large); one dorsal. Femur with seven small ventral tubercles, slightly swollen at distal fifth. Patella swollen at distal third. Tibia ( Fig. 2 C): ectal IIiIi, mesal IIiIi, with five ventral tubercles. Tarsus ( Fig. 2 C): ectal iIiiIii, mesal IiIiIi, with six ventral tubercles.

Legs: Coxa I with two tubercles, anterior bifid; II with one anterior, one posterior; III with one anterior fused with one of coxa II, one posterior fused with one of IV; IV with two large tubercles close to dorsal scutum margin, one dorsoapical small spine. Trochanter I with three ventral, one retrolateral tubercle; II with six ventral, two prolateral, four dorsal (one large); III with four ventral, five retrolateral (apical larger), one dorsal large; IV with six ventral, four dorsal tubercles, one dorsoapical spine (larger), two prolateral tubercles and two retrolateral tubercles (apical larger). Femur I–II with small tubercles; I–IV with one dorsoapical anterior small tubercle, one dorsoapical posterior large tubercle; III–IV with two ventral rows of tubercles increasing in size on distal third; IV ( Fig. 2 D–E) with one dorsal row of tubercles at distal third. Patella IV ( Fig. 2 D–E) with two dorsodistal strong tubercles, several dorsal large tubercles, ventrally with three tubercles, one apical and larger. Tibia IV ( Fig. 2 D–E) with one dorsal row of large tubercles, one ventral row of tubercles increasing in size distally, two ventroapical tubercles. Metatarsus IV with dorsobasal large tubercle. Claws with five teeth. Tarsal segmentation: 7, 17, 6, 7. First two segments of tarsus I swollen.

Penis ( Fig. 12 D–F): Ventral plate thin, slightly concave on distal margin, with long base, two dorsal setae, and one ventral seta each side. Glans long, with two pairs of setae on base; stylus with ventroapical projection. Truncus with six pairs of lateral setae.

Color: Dark-brown, reticulate on prosoma and chelicera, dorsal femur apex, patella and tibia IV darker. Border of grooves black. Pedipalpus yellowish. Margins of dorsal scutum, grooves II–IV and free tergites yellowish.

Female description (MZSP-36532): Measurements: DSL 3.7; PL 1.7; DSW 3.1; PW 2.7; ID 1.6; chelicera II 1.8; III 0.9; pedipalpus 7.1; leg I 11.1; II 23.9; III 15.8; IV 21. 9.

Anterior margin with three tubercles each side; prosomal spine smaller than male. Area I with four tubercles each side; II with three tubercles each side. Posterior margin and free tergites with one row of minute tubercles. Pedipalpus: tarsus: ectal iIiiIii, mesal IIIii, with 17 ventral tubercles. Coxa IV with small dorsoapical tubercle. Leg I–IV with small tubercles, except femur apex with dorsoapical tubercles similar in size to male. Tarsal segmentation: 7, 17, 6, 7.

Distribution: Recorded only from the type locality, from 860 to 2,000 m.a.s.l.

Figures

FIGURE 2. Stygnoplus ianomami sp. nov. A, habitus, dorsal view; B, lateral view; C, left pedipalpal tibia and tarsus; D – E, trochanter-tibia of the right leg IV, D, ventral view; E, dorsal view. Scale bars: 2 mm.

FIGURE 12. Penis (dorsal, lateral, ventral views, respectively) of some new species of Stygnidae: A – C, Imeri lomanhungae sp. nov.; D – F, Stygnoplus ianomami sp. nov.; Stygnoplus neblina sp. nov.. Scale bars: 0. 1 mm.