Stenoterommata pavesii, Indicatti, Rafael P., Chavari, João L., Zucatelli-Júnior, Maurílio, Lucas, Sylvia M. & Brescovit, Antonio D., 2017

Indicatti, Rafael P., Chavari, João L., Zucatelli-Júnior, Maurílio, Lucas, Sylvia M. & Brescovit, Antonio D., 2017, Six new species of silk-lined burrow spider genus Stenoterommata Holmberg, 1881 (Araneae, Nemesiidae) from southern Brazil, Zootaxa 4254 (4), pp. 435-456 : 437-442

Stenoterommata pavesii sp. nov.

( Figs 1, 2 , 7–11 , 17–40 )

Types. Male holotype from Parque Nacional da Serra do Itajaí, Setor Nascentes, ca. 350 m asl, 27°03’13.49’’S, 49°05’09.22’’W, Blumenau , Santa Catarina, Brazil, 27.vi–07.vii.2014, R.P. Indicatti & B. Gambaré coll., IBSP 166231 . Paratypes: same data as holotype, 14–20.i.2013, 3 females ( IBSP 166059 ; 166060; MCN 49773); Pousada Rio da Prata, Trilha Fria, 210 m asl, 27°01’47,97’’S, 49°05’38,73’’W, Nova Russia, Blumenau , Santa Catarina , Brazil, 6–10.vii.2009, R.P. Indicatti & B. Gambaré coll., 1 female ( IBSP 166061 ); Área de Relevante Interesse Ecológico do Salto, ca . 100 m asl, 26°53’14.4’’S, 49°06’10.6’’W, Blumenau, Santa Catarina, Brazil, 16.vii.2016, pitfall traps, B.G. Alves coll., 1 male ( FURB CH810); Parque Natural Municipal Bromberg , ca . 150 m asl, 26°53’35.6’’S, 49°06’38.8’’W, Blumenau , Santa Catarina , Brazil, 16.iv.2016, pitfall traps, B.G. Alves coll., 1 male ( FURB CH797); Parque Unipraias, Morro da Aguada, 240 m asl, 27°00’08.39’’S, 48°35’49.66’’W, Balneário Camboriú , Santa Catarina , Brazil, vi.2009 – v.2010, pitfall traps, M. Zucatelli Jr. coll., 2 males (IBSP 166063; 166064); 1 female (IBSP 166065); 5 males ( FURB CH 689; MCN 49772; MCTP 37542 ; MNRJ 6995 ; MZSP 66207 ) ; 24–27.viii.2014, R.P. Indicatti, J.L. Chavari, M. Zucatelli Jr. & Y. Lemos coll., 1 female (IBSP 166217).

Additional material examined. BRAZIL, Santa Catarina: Blumenau (Parque Nacional da Serra do Itajaí, Setor Nascentes , ca. 350 m asl, 27°03’13.49’’S, 49°05’09.22’’W), 14–20.i.2013, R.P. Indicatti & B. Gambaré coll., 1 female ( IBSP 166062 ) ; 27.vi–07.vii.2014, R.P. Indicatti & B. Gambaré coll., 2 females ( IBSP 166229 ; 166230); ( Parque Natural Municipal Bromberg , ca. 150 m asl, 26°53’35.6’’S, 49°06’38.8’’W) , 16.iv.2016, pitfall traps, B.G. Alves coll., 1 male ( FURB CH 796) ; 16.vii.2016, 1 male ( FURB CH 1179); ( Parque Natural Municipal São Francisco de Assis , ca. 50 m asl, 26°55’15.7’’S, 49°04’32.0’’W) , 15.iv.2016, pitfall traps, B.G. Alves coll., 1 male ( FURB CH 1175); Balneário Camboriú (Morro da Aguada, Parque Unipraias , 240 m asl, 27°00’08.39’’S, 48°35’49.66’’W) , vi.2009 – v.2010, pitfall traps, M. Zucatelli Jr. coll., 15 males, 2 juveniles (IBSP 166066–166077); 24–27.viii.2014, R.P. Indicatti, J.L. Chavari, M. Zucatelli Jr. & Y. Lemos coll., 3 females (IBSP 166216; 166218; 166222).

Diagnosis. Males of Stenoterommata pavesii sp. nov. differ from those other congeners by the male palpal bulb with wider and ventrally curved embolus ( Figs 7, 9 ). Females resemble those of S. uruguai Goloboff, 1995 , S. quena Goloboff, 1995 , S. arnolisei Indicatti et al., 2008 , S. grimpa Indicatti et al., 2008 and S. gugai sp. nov. by the spermathecae with wider basal dome ( Fig. 10 ). It can be distinguished from the abovementioned species by the triangular basal dome in frontal view ( Fig. 11 ) and shorter ducts of the receptacula ( Fig. 10 ).

Etymology. The specific name is a patronym in honor of Mário Pavesi, who has worked towards the conservation of the Parque Nacional da Serra do Itajaí in the Nova Russia region, Blumenau, state of Santa Catarina, Brazil.

Description. Male (holotype). Color pattern in ethanol: carapace and femora I–IV brown, patellae–tarsi yellowish brown. Body with light pubescence ( Fig. 24 ), covered with golden setae. Abdomen dorsally brownish yellow with brown mottling forming discrete chevron and ventrally yellowish-brown, with two small posterior lateral spots. Total length 12.82. Carapace 5.92 long, 4.51 wide, with short and procurved fovea ( Fig. 27 ). Abdomen 5.40 long, 3.32 wide. Thoracic region slightly raised. Clypeus narrow, 0.10 ( Fig. 25 ). Eye tubercle weakly elevated, wider than long. Anterior eye row slightly procurved, posterior recurved ( Figs 24, 25 ). Eye sizes: AME 0.32, ALE 0.34, PME 0.22 and PLE 0.24. Chelicerae with eight teeth in prolateral row, with ca. 30 basal smaller teeth and rastellum weak, formed by long thin setae ( Fig. 29 ). Intercheliceral tumescence small, pale yellow, covered with few setae ( Figs 26, 27 ). Labium 0.45 long, 1.02 wide, with no cuspules. Maxillae with ca. 70 pointed and elongated cuspules ( Figs 29, 30 ) on internal basal angle. Serrula developed ( Fig. 28 ). Sternum oval 3.12 long, 2.41 wide. Sternal sigilla small, granulate, marginal: anterior and median rounded, posterior ovalelongated, three times size of anterior, away from margin by ca. 1/3 length ( Fig. 31 ). Palp: measurements: femur 2.69/ patella 1.10/ tibia 2.12/ cymbium 0.80/ total 6.71; spination: femur d0-0-0-1-1p-2-1, tibia r1ap. Legs: measurements: I: femur 5.01/ patella

2.59/ tibia 3.70/ metatarsus 3.52/ tarsus 3.00/ total 17.82; II: 4.22/ 2.20/ 3.31/ 3.30/ 2.93/ 15.96; III: 4.22/ 2.29/ 3.20/ 4.12/ 2.60/ 16.43; IV: 5.49/ 2.31/ 4.70/ 6.12/ 2.92/ 21.54; spination: I: femur d1-1-1r-1-2-2-0, patella p0-0-1, tibia v0-1r-0-1r-1-0-(1r megaspine, Fig. 32 ), p0-1p-0-1p-0, metatarsus v2 ap, p0-1-0-1; II: femur d0-1-2-0-2-1p-1r, patella p0-0-1, tibia v1 p-1r-0-1r-0-3ap, p0-1-0-1-0, metatarsus d0-0-1p-0, v0-0-1r-1r-1-0-2ap, p0-1p-0-1p-0-1p, r0- 0-1-0; III: femur d0-1-1-0-1-1r-1r-1p-0, patella p0-1-1-1-0, r0-1-0, tibia d0-0-1, v2 -0-1r-0-2ap, p0-1-0-1-0, r0-1-0- 1-0, metatarsus d1r-0-1p-0-1p-0-0-2, v0-2-0-1r-1p-1ap, p0-1r-0-1r-0-1, r0-1-0-1-0-1; IV: femur d0-1-1-0-1-1r-1r- 1p-0, patella r0-0-1, tibia v4 -0-2-0-0-3ap, p0-1-0-1-0, r0-1s-0-1-0, metatarsus d0-1r-0-1p-0-0-0-1p-2, v0-1p-1r-0- 0-1p-1r-1p-1ap, r0-1-1-1-0-1-0. Metatarsal preening combs: II: 4VP thin setae; III: 4VP, 3VR; IV: 5VP, 4VR. Tarsi I–IV flexible. Scopulae on tarsi I, II dense ( Figs 35–37 , tarsus I) and symmetric, III, IV light. Scopula on tarsi I undivided, II–IV divided by thin setae: II by one row, III by four rows and IV by six rows. Scopulae on 1/5 of metatarsi I, II divided by five rows of setae, III, IV absent. STC large with double row of teeth ( Fig. 37 ): I: 9 in each row; II and IV: 10 in each row; III: 8, 9, 9, 8. ITC on tarsus IV. Trichobothria with rounded, elevated bases with ca. 25 ridges ( Fig. 34 ). Tarsal organ oval, slightly elevated with 4–5 concentric ridges ( Fig. 33 ). Four spinnerets: PLS: basal segment 1.26, median segment 0.84, apical segment triangular 0.48 long ( Fig. 38 ); PMS with pumpkiniform spigots ( Fig. 39 ); PLS with dense and enlarged pumpkiniform spigots along inner edge on all segments ( Fig. 40 ).

Palp: cymbium with thin setae, resembling tarsal scopulae setae; tibia long, narrow ( Figs 7, 9 ) and with shallow ventral excavation ( Figs 7, 9 , 20 ); tibial excavation ( Fig. 23 ) and basal region of tegulum ( Figs 17, 20 ) with grooves, suggesting possible stridulatory apparatus; bulb piriform with six parallel keels ( Figs 8 , 19, 21, 22 ).

Female (paratype IBSP 166059). Color pattern and pubescence in ethanol, as in male. In living specimen: carapace and femora I–IV dark-brown ( Figs 1, 2 ). Total length 18.89. Carapace 7.19 long, 5.19 wide, with short and procurved fovea ( Fig. 1 ). Abdomen 8.11 long, 4.09 wide. Thoracic region slightly raised. Clypeus narrow, 0.25 ( Fig. 1 ). Eye tubercle weakly elevated, wider than long. Anterior eye row procurved, posterior recurved. Eye sizes: AME 0.32, ALE 0.36, PME 0.24 and PLE 0.35. Chelicerae with eight teeth in prolateral row, with ca. 30 basal smaller teeth and rastellum weak, formed by long thin setae. Labium 0.80 long, 1.42 wide, with no cuspules. Maxillae with 90 blunt cuspules on internal basal angle. Serrula absent. Sternum oval 3.81 long, 3.40 wide. Sternal sigilla as in male. Palp: measurements: femur 4.12/ patella 2.31/ tibia 2.49/ tarsus 2.10/ total 11.03; spination: tibia v2 -0-3-4ap, p0-1-0, r0-0-1ap. Legs: measurements: I: femur 5.39/ patella 3.50/ tibia 3.80/ metatarsus 3.02/ tarsus 2.52/ total 18.24; II: 4.10/ 3.00/ 3.01/ 2.72/ 2.10/ 14.93; III: 4.10/ 2.60/ 2.51/ 3.22/ 2.01/ 14.44; IV: 6.02/ 3.20/ 4.51/ 5.02/ 2.51/ 21.26; spination: I: metatarsus v0-1-0-2ap; II: tibia p0-0-1-0, metatarsus v0-1-1-0, p0-1-0; III: patella p0-1-1-1-0, r0-1-0, tibia d0-0-1-0, v0-0-2ap, p0-1-1-0, r0-1-0, metatarsus d0-1-2-2-2, v0-2-2-1p-3ap, p1-1-1, r0-0- 1; IV: femur patella r0-1-0, tibia v0-0-2ap, r0-1-0-1-0, metatarsus d0-2-0-2-0-2, v0-2-0-2-3ap, p0-1-0-1-0-1-0, r0- 1-0-1-0. Metatarsal preening combs: II: 3VP, 6VR; III: 10VP, 10VR; IV: 4VP, VR5. Tarsi I–IV not flexible, rigid. Scopulae on tarsi I, II dense and symmetric, III, IV light. Scopulae on tarsi I undivided, II–IV divided by thicker setae: II by four rows, III and IV by 10 rows. Scopulae on 3/4 of metatarsi I, II divided by thicker setae: I by two rows, II by five rows. Scopulae on metatarsi III, IV absent. STC large with double row of teeth: I–III: 4–5; IV: 4, 4, 6, 4. ITC on tarsus IV. Palpal claw with four teeth on promargin. Trichobothria and tarsal organ as in male. Four spinnerets, PLS: basal segment 1.52, median segment 1.10, apical segment triangular 0.62 long ( Fig. 1 ). Spigots as in male. Spermathecae with 2–3 receptacula on each side ( Figs 10, 11 ).

Variation. Males (n=12): total length 12.35–14.34; carapace 5.11–6.34 long; maxillae with 67–78 cuspules. Females (n=7): total length 15.30–18.89; carapace 5.80–5.91 long; maxillae with 80–107 cuspules.

Distribution. Southern Brazil, state of Santa Catarina.

Figures

FIGURES 1 – 6. Stenoterommata spp. from eastern Santa Catarina state, Brazil. 1, 3 – 6. Habitus. 1, 2. Stenoterommata pavesii sp. nov., female (IBSP 166059) from Parque Nacional da Serra do Itajaí (PNSI), Blumenau. 2. Spider burrow, frontal view. 3, 4. Stenoterommata gugai sp. nov. from Parque Municipal da Lagoinha do Leste, Santa Catarina Island, Florianópolis. 3. Male (IBSP 166213). 4. Female (IBSP 166212). 5. Stenoterommata leticiae sp. nov., female (IBSP 166201) from PNSI. 6. Stenoterommata pescador sp. nov., female (IBSP 166232) from Pântano do Sul, Santa Catarina Island, Florianópolis. Photos: R. P. Indicatti.

FIGURES 7 – 16. Stenoterommata spp. 7 – 11. Stenoterommata pavesii sp. nov. 7 – 9. Male holotype, left palpal bulb. 7. prolateral view. 8. Dorsal view. 9. Retrolateral view. 10, 11. Female, spermathecae, paratype IBSP 166062. 10. Dorsal view. 11. Frontal view. 12 – 16. Stenoterommata gugai sp. nov. 12 – 14. Male holotype, left palpal bulb. 12. Prolateral view. 13. Dorsal view. 14. Retrolateral view. 15, 16. Female, spermathecae, paratype IBSP 166079. 15. Dorsal view. 16. Frontal view. Abbreviations: bd = spermathecal basal dome; du = receptaculum duct; e = palpal embolus; k = keels; r = receptaculum; rk = retrolateral keel with triangular apical end; sb = spermathecal base; tg = tegular grooves. Scale bars: 1 mm.

FIGURES 17 – 28. Stenoterommata pavesii sp. nov., male (IBSP 166077). 17 – 23. Left palpal bulb. 17, 18. Prolateral view. 19. Embolus and keels, dorsal view. 20. Tegulum with grooves, detail, prolateral view. 21, 22. Embolus and keels, dorsal view. 22. Keel, detail. 23. Palpal tibia excavation. 24, 25. Carapace, dorsal view. 25. Detail of eye tubercle. 26. Left chelicera, prolateral view. 27. Intercheliceral tumescence, detail. 28. Serrula, frontal view.

FIGURES 29 – 40. Stenoterommata pavesii sp. nov., male (IBSP 166077). 29, 30. Cuspules on maxilla. 30. Cuspule, detail, lateral view. 31. Sigillum. 32 – 37. Right leg I. 32. Megaspine on tibia, retrolateral view. 33. Tarsal organ, dorsal view. 34. Tarsal trichobothria, dorsal view. 35. Claws, retrolateral view. 36. Scopula, detail. 37. Claw, ventral view. 38 – 40. Spinnerets. 39. Posterior median spinneret. 40. Pumpkiniform spigots, posterior lateral spinneret.