Stenoterommata sevegnaniae, 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 : 447-450

Stenoterommata sevegnaniae sp. nov.

( Figs 49–53 )

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, 18.v.2004 – 28.ii.2005, R.C. Francisco coll. (IBSP 114758). Paratypes: same data as holotype, 1 female ( IBSP 114756 ) ; 1 male (IBSP 114753); 4 males ( FURB CH 1863; MZSP 66208 ; MCN 49774; MCTP 37543 ) .

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), 18.v.2004 – 28.ii.2005, R.C. Francisco coll., pitfall traps, 4 males (IBSP 114751; 114752; 114755 used on SEM; 114757).

Diagnosis. Males of S. sevegnaniae sp. nov. resemble those of S. palmar Goloboff, 1995 and S. tenuistyla Goloboff, 1995 by the long and slender embolus ( Figs 49–51 , 56, 57 ), but can be distinguished by the palpal bulb with straight duct and more elevated keels ( Figs 49–51 , 56–58 ). Females resemble those of S. tenuistyla and S. pescador sp. nov. by the spermathecae having a reduced basal dome, but can be distinguished by the rounded basal dome with a single receptaculum arising from the internal side ( Figs 52, 53 ).

Etymology. The specific name is a patronym in honor of Dr. Lucia Sevegnani (in memoriam), a researcher who has actively worked in the study and conservation of several areas of the Santa Catarina state, mainly in the Itajaí watershed Valley.

Description. Male (holotype). Color pattern in ethanol: carapace yellowish brown, legs brown. Body with light pubescence, covered with golden setae. Abdomen dorsally brownish yellow with four brown mottled areas forming chevron and ventrally yellowish brown with eight spots. Total length, 8.12. Carapace 3.60 long, 2.60 wide, with short and procurved fovea. Abdomen 3.52 long, 1.81 wide. Thoracic region slightly raised. Clypeus narrow, 0.05. Eye tubercle weakly elevated, wider than long. Anterior eye row slightly procurved, posterior recurved. Eye sizes: AME 0.14, ALE 0.21, PME 0.13 and PLE 0.17. Chelicerae with eight teeth in prolateral row, with ca. 20 basal smaller teeth and rastellum weak, formed by long thin setae. Intercheliceral tumescence small, pale yellow covered with few setae. Labium 0.20 long, 0.41 wide, with no cuspules. Short maxillae with ca. 45 blunt cuspules on internal basal angle. Serrula restricted to one small portion of maxillary lobe and poorly developed ( Figs 59, 60 ). Sternum oval 1.92 long, 1.50 wide. Sternal sigilla very small, granulate, marginal: anterior and median rounded, posterior oval-elongated, twice the size of anterior, away from margin by ca. 1/4 length. Palp: measurements: femur 1.49/ patella 0.99/ tibia 1.11/ cymbium 0.60/ total 4.19; spination: tibia p0-0-2-2, r0-0-0-1. Legs: measurements: I: femur 2.31/ patella 1.50/ tibia 1.80/ metatarsus 1.71/ tarsus 1.10/ total 8.42; II: 2.20/ 1.50/ 1.62/ 1.30/ 1.10/ 7.72; III: 2.00/ 1.10/ 1.40/ 1.71/ 1.10/ 7.31; IV: 2.41/ 1.60/ 1.80/ 2.71/ 1.30/ 9.82; spination: I: femur d0-0-1, patella 0, tibia v0-1-0-1-0-(1p, 1r megaspine, Fig. 61 ), p0-0-1-0, metatarsus v0-1-1r-1, p0-1-0-1, 0- 1-0-0; II: femur d0-0-1, tibia v1-1 -0-2ap, p0-0-1, metatarsus v1-1 -0-2ap, p0-0-1; III: femur d0-2-1-2-0, patella p0- 1-1-1-2, r0-1-0, tibia d0-0-1, v2-2 -0-3ap, p0-2-1-2-0, r0-1-0-1-0, metatarsus d1-2-2-0-0-2, v2 -0-2-0-2-3ap, p1-1-0, r0-1-0-1-0-0; IV: femur d0-0-0-2, patella p0-1-1, r0-1-0, tibia v2 -0-2-0-3ap, p0-1-1-0, r0-1-0, metatarsus d1-2-1p- 2-0-2, v2 -0-2-0-3ap, p1-0-1-0-1-0, r0-1-0. Tibia III, IV with elongated spines on lateral and ventral side ca. 2/5 of length of segment, metatarsi III, IV on all sides ca. half of length of segment. Metatarsal preening combs: II: 4VP thick setae; III: 4VP, 4VR; IV: 5VP, 5VR. Thickened legs I–IV. Tarsi III, IV flexible. Scopulae on tarsi I ( Figs 62– 64 ) and II very light, symmetric and undivided, III, IV absent. Scopulae on 2/3 of metatarsi I, and 1/5 on II divided by six rows of thin setae, III, IV absent. STC large with double row of teeth: I: 10 on each row; II: 8, 10, 10, 9; III: 10, 8, 8, 10; IV: 10 on each row; ITC on tarsi I–IV. Trichobothria and tarsal organ as in S. pavesii sp. nov. Four spinnerets: PLS: basal segment 0.45, median segment 0.25, apical segment triangular 0.35 long. Spigots as in S. pavesii sp. nov. Palp: cymbium with thin setae, resembling tarsal scopula setae; tibia long, narrow ( Figs 49, 51 ) and with shallow ventral excavation ( Figs 49, 51 ); tibial excavation and basal region of tegulum ( Figs 49, 50 , 56 ) with grooves, suggesting possible stridulatory apparatus; bulb piriform with nine parallel keels ( Figs 49–51, 54– 56 ).

Female (paratype IBSP 114756). Color pattern and pubescence in ethanol as in male. Total length 10.25. Carapace 3.53 long, 2.62 wide; short, procurved fovea. Abdomen 5.32 long, 3.11 wide. Thoracic region slightly raised. Clypeus very narrow, 0.06. Eye tubercle weakly elevated, wider than long. Anterior eye row procurved, posterior recurved. Eye sizes: AME 0.16, ALE 0.20, PME 0.14, PLE 0.16. Chelicerae with nine teeth in prolateral row, with ca. 25 basal smaller teeth and rastellum weak, formed by long thin setae. Labium 0.25 long, 0.50 wide, with no cuspules. Maxillae with ca. 50 blunt cuspules on internal basal angle. Serrula absent. Sternum oval 1.76 long, 1.51 wide. Sternal sigilla as in male. Palp: measurements: femur 1.52/ patella 1.01/ tibia 1.10/ tarsus 0.80/ total 4.43; spination: femur d0-0-1p, tibia v0-1p-3ap. Legs: measurements: I: femur 2.12/ patella 1.60/ tibia 1.50/ metatarsus 1.21/ tarsus 0.81/ total 7.06; II: 1.81/ 1.30/ 1.30/ 1.11/ 0.80/ 6.32; III: 1.81/ 1.10/ 1.20/ 1.61/ 1.20/ 6.92; IV: 2.41/ 1.80/ 1.60/ 2.61/ 1.30/ 9.72; spination: I: femur d0-0-1p, metatarsus v0-1r-2-0-2ap; II: tibia v0-2-0-2ap, metatarsus v0-2-2-2ap; III: femur d0-0-2, patella p0-1-0, r0-1-0, tibia v0-2-0-2ap, p0-1-1-0, r0-1-0, metatarsus d1- 2-2-0-2, v0-2-0-2-0-3ap, p1-1-1-0, r0-1-0; IV: patella p0-1-1, r0-1-0, tibia v2 ap, p0-1-2-1, r0-1-1-0, metatarsus d1- 2-0-2-0-2, v0-2-0-1p-0-2-0-3ap, p0-0-1-0-1, r0-1-0. Legs III, IV with weakly developed spines on all sides: tibia ca. 2/5 length of segment, metatarsus ca. 1/3 length of segment. Metatarsal preening combs: II: 5VP; III: 4VP, 4VR; IV: 4VP, 4VR. Thickened legs I–IV. Tarsi I–IV not flexible, rigid. Scopulae on tarsi I, II dense, symmetric and divided by five rows of thin setae, III, IV absent. Scopulae on 3/4 of metatarsi I divided by five rows of thin setae and on 1/5 of II divided by eight rows of thin setae. Scopulae on metatarsi III, IV absent. STC large with double row of teeth: I and IV: 8, II: 6, III: 9. ITC on tarsi I–IV. Palpal claw with five teeth on promargin.Trichobothria and tarsal organ as in S. pavesii sp. nov. Four spinnerets: PLS: basal segment 0.50, median segment 0.49, apical segment triangular 0.42 long. Spigots as in S. pavesii sp. nov. Spermathecae formed by branch with single receptaculum arising from internal border of basal dome on each side ( Figs 52, 53 ).

Variation. Males (n=5): total length 6.20–8.10; carapace 2.70–3.20 long; maxillae with 37–47 cuspules. Distribution. Known only from the type locality, Blumenau, Santa Catarina, Brazil.

Figures

FIGURES 49 – 55. Stenoterommata spp. 49 – 53. Stenoterommata sevegnaniae sp. nov. 49 – 51. Male holotype, left palpal bulb. 49. Prolateral view. 50. Dorsal view. 51. Retrolateral view. 52, 53. Female, spermathecae, paratype IBSP 114756. 52. Dorsal view. 53. Frontal view. 54, 55. Stenoterommata pescador sp. nov., female holotype, spermathecae. 54. Dorsal view. 55. Frontal view. Abbreviations: bd = spermathecal basal dome; du = receptaculum duct; r = receptaculum; sb = spermathecal base. Scale bars: Figs 49, 51 – 55 = 1 mm; Fig. 50 = 0.5 mm.

FIGURES 56 – 64. Stenoterommata sevegnaniae sp. nov., male (IBSP 114755). 56 – 58. Right palpal bulb, retrolateral view. 57. Embolus and keels. 58. Keels, detail. 59, 60. Serrula, frontal view. 61 – 64. Right leg I, retrolateral view. 61. Megaspine on tibia. 62. Tarsus and scopula, general view. 63. Scopula and claws, retrolateral view. 64. Scopula, detail.