Stenoterommata chavarii Ghirotto & Indicatti, 2021

Ghirotto, Victor Morais, Guadanucci, José Paulo Leite & Indicatti, Rafael Prezzi, 2021, The genus Stenoterommata Holmberg, 1881 (Araneae, Pycnothelidae) in the Cerrado and Atlantic Forest from Southeastern and Central Brazil: description of four new species, Zoosystema 43 (17), pp. 311-339 : 328-332

publication ID

https://doi.org/ 10.5252/zoosystema2021v43a17

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:7C484284-5BD4-410A-BB6E-0AF98E4F0357

DOI

https://doi.org/10.5281/zenodo.5008674

persistent identifier

https://treatment.plazi.org/id/42DEC204-EE4C-4001-81B7-E6A946F23BE9

taxon LSID

lsid:zoobank.org:act:42DEC204-EE4C-4001-81B7-E6A946F23BE9

treatment provided by

Felipe

scientific name

Stenoterommata chavarii Ghirotto & Indicatti
status

n. sp.

Stenoterommata chavarii Ghirotto & Indicatti , n. sp.

( Figs 1F View FIG ; 13-17 View FIG View FIG View FIG View FIG View FIG )

urn:lsid:zoobank.org:act:42DEC204-EE4C-4001-81B7-E6A946F23BE9

TYPE MATERIAL. — Holotype. Brazil • 1 ♂; São Paulo, Botucatu, Fazenda Experimental Edgárdia ; 22°48’28.5”S, 48°23’36.6”W; 02.VI.2014; R. C. B. Paradero leg.; restauration area, collected with pitfall traps; CAD 585 . GoogleMaps

Paratypes. Brazil • 1 ♀; same data as the holotype; CAD 776 GoogleMaps 6 ♂; same data as the holotype; CAD (1 ♂ CAD 777 ), IBSP (1 ♂), MZUSP (1 ♂), MNRJ (1 ♂ MNRJ 7689 View Materials ), MCTP (1 ♂), MCN (1 ♂) GoogleMaps 1 ♂; same locality and leg. as holotype; 21.XI.2013; pasture area; CAD 591 GoogleMaps 1 ♂, same locality and collector as the holotype; 18.VIII.2015; forest area; CAD 577 GoogleMaps .

ADDITIONAL MATERIAL EXAMINED. — Brazil • 8 ♂; same data as the holotype; CAD (2 ♂ CAD 778 , 2 ♂ CAD 779 ), IBSP (2 ♂), MZUSP (1 ♂), MNRJ (1 ♂ MNRJ 7690 View Materials ) GoogleMaps 2 ♂; same locality as the holotype; 11.XI.2013; CAD 587 GoogleMaps .

DIAGNOSIS. — Males of S. chavarii Ghirotto & Indicatti , n. sp. resemble those of S. crassimana , S. palmar , S. sevegnaniae and S. tenuistyla by the palpal bulb with thin, filiform embolus ( Fig. 14 View FIG A-D, J). It can be distinguished from S. sevegnaniae and S. tenuistyla by the curved embolus at the tip ( Fig. 14 View FIG A-D, J); from S. crassimana by the palpal duct much less curved in medial region ( Fig. 14B, D View FIG ) and lacking stains ventrally on abdomen ( Fig. 14D View FIG ); from S. palmar by the palpal tibia with 2 spines on prolateral-medial region ( Fig. 14E View FIG ) and presence of ITC on legs III, IV. Females can be distinguished from the remaining species of the genus, except from S. quena Goloboff, 1995 , by the presence of metatarsal preening combs on leg I and on VP and VR sides of leg II; differs from S. quena and resembles S. platensis Holmberg, 1881 and S. iguazu by the spermathecae with two independent bases on each side ( Fig. 16 View FIG ) and prolateral spines 1-1-1 on patella III; differs from them by the elongated basal dome, metatarsal preening combs on all legs and anterior eye row slightly recurved ( Fig. 15A View FIG ).

ETYMOLOGY. — The specific name is a patronym in honor of João Lucas Chavari, friend of the last authors and collector of several mygalomorph spiders from Brazil.

DESCRIPTION

Male (holotype)

Color pattern: in ethanol, chelicerae, carapace reddish brown covered with golden setae ( Fig. 13A View FIG ), legs brown, covered with black and golden setae. Sternum, maxillae and coxae yellowish brown ( Fig. 13B View FIG ). Abdomen yellowish light brown with dark brown mottling forming discrete chevron ( Fig. 13C View FIG ). Total length 10.23. Chelicerae 0.90 long, 0.75 wide (only left side).Carapace 5.08 long, 3.64 wide, with narrow, procurved fovea, 0.48 wide. Abdomen 3.98 long, 2.25 wide. Thoracic region raised. Clypeus very narrow, 0.06 long. Eye tubercle 0.59 long, 0.86 wide, slightly elevated. Anterior eye row slightly procurved, posterior slightly recurved ( Fig. 13A View FIG ). Eye sizes: AME 0.19, ALE 0.28, PME 0.19, PLE 0.21. Chelicerae with 8 teeth in prolateral row, with c. 20 basal smaller teeth, rastellum weak formed by long thin setae ( Figs 13B View FIG ; 14H View FIG ). Intercheliceral tumescence small, with few setae on basal region ( Fig. 14H View FIG ). Labium 0.35 long, 0.76 wide, without cuspules ( Fig. 13B View FIG ). Maxillae with 48/54 blunt and clavate cuspules on internal basal angle ( Fig. 13B View FIG ), becoming thin and very elongated at inner margin edge. Serrula developed ( Fig. 14I View FIG ). Sternum oval, 2.38 long, 1.99 wide. Labial sigilla distant from margin by c. 0.1× its length, same size as anterior sternal sigilla. Sternal sigilla ( Fig. 13B View FIG ): anterior slightly smaller than medium, posterior the largest; anterior and posterior distant from margin by c. 1× length, medium by c. 0.5× length. Measurements: palp: femur 1.97/ patella 1.00/ tibia 1.17/ cymbium 0.56/ total 4.70; legs: measurements: I: femur 3.46/ patella 2.18/ tibia 2.45/ metatarsus 2.36/ tarsus 1.72/ total 12.17; II: 3.13/ 1.92/ 1.95/ 2.24/ 1.76/ 11.00; III: 3.09/ 1.67/ 1.78/ 2.78/ 1.82/ 11.14; IV:4.04/ 2.08/ 2.77/ 4.04/ 2.02/ 14.95. Spination: palp: femur: d0-0-0-0-0-0-2-2; patella: p0-0-1; tibia:p0-0-2-0-2, r1sap; legs: femora:I: d0-0-0-0-1r-2; II: d0-1r-1r-2-2; III: d0-0-2-2-2; IV: d0-0-2-0-2-2; patellae: I: p0-0-1; II: p0-0-1; III: p1-1-1, r0-0-1-0; IV: r0-0-1-0; tibiae: I: v1-0-1-2-0-1p + 1r megaspine ( Fig. 14G View FIG ), p0-0-1-1-0; II: v1- 1-0-3ap, p0-0-1-1-0; III: d0-1, v2-3-0-3ap, p0-1-1-0, r0-1-0; IV: v2-2-0-3ap, p0-1-1-0, r1-1-0-1-0; metatarsi: I: v0-2-0-1ap, p0-1-0-1ap,r0-0-0-1-0; II:d0-1-0, v0-1r-1r-1p-0-3ap, p1-1-0-1, r0-0-1-0; III: d1r-1r-1p-0-2-0-0-2, v2-2-3ap, p1-0-1-1, r1-1-0; IV: d2-1p-0-1r-1p-0-2, v0-2-0-1p-1r-1p-3ap, p1-1-1, r1-0-1- 0. Metatarsal preening combs: III: 3VR, 4VP; IV: 4VR, 3VP. Combs of leg IV are formed by thicker setae.Tarsi I-IV flexible ( Fig. 14G View FIG , tarsus I). Scopulae on tarsi I-IV light and symmetric; I, II divided by 2 sparse rows of thin setae; III divided by 4-5 rows; IV divided by 5 rows, III, IV divided by thicker setae. Scopulae on 1/3 of metatarsi I, II, divided by 2 rows of thicker setae; III, IV absent. STC large with double row of teeth: I: 6, 6, 5, 6; II: 7, 6, 6, 6; III: 8, 8, 6, 7; IV: 9, 8, 7, 8. ITC on tarsi III, IV. Tricobothria with rounded, elevated bases. Around 20 epiandric spigots. Four spinnerets ( Fig. 13D View FIG ): PMS 0.44 long, with pumpkiniform spigots on apical half. PLS: basal segment 0.92, median 0.56, apical triangular short, 0.36 long, with wide band of pumpkiniform spigots on inner edge of all segments. Palp ( Fig. 14E, F View FIG ): cymbium with elongate dense setae, denser at tip ( Fig. 14E, F View FIG ); tibia ventrally with a shallow excavation on apical third ( Fig. 14E, F View FIG ); tibial excavation and basal region of tegulum with grooves ( Fig. 14 View FIG A-D); bulb piriform, thin embolus curved at the tip, with c. 20 parallel keels ( Fig.14 View FIG A-D, J).

Female (paratype CAD 776)

Color pattern: in ethanol, chelicerae reddish dark brown, carapace ( Fig. 15A View FIG ) and legs brown, covered with few black and golden setae, Sternum, coxae, and maxillae yellowish brown ( Fig. 15B View FIG ). Abdomen dorsally light yellowish brown with dark brown mottling forming a chevron ( Fig. 15C View FIG ), ventrally light yellowish brown ( Fig. 15D View FIG ). Total length 12.68. Chelicerae 1.70 long, 1.12 wide (only left side). Carapace 5.12 long, 3.50 wide, with narrow, procurved fovea 0.45 wide. Abdomen 5.86 long, 3.58 wide. Thoracic region slightly raised. Clypeus narrow 0.10 long. Eye tubercle 0.45 long, 0.85 wide, slightly elevated. Anterior eye row slightly recurved, posterior recurved ( Fig. 15A View FIG ). Eye sizes: AME 0.20, ALE 0.27, PME 0.17, PLE 0.20. Chelicerae with 8 teeth in prolateral row, with c. 20 basal smaller teeth, rastellum weak, formed by long thin setae ( Fig. 15B View FIG ). Labium 0.47 long, 0.84 wide, with 2 cuspules ( Fig. 15B View FIG ). Maxillae with 72/73 blunt cuspules on internal basal angle ( Fig. 15B View FIG ). Serrula weak. Sternum oval, 2.68 long, 2.15 wide. Labial sigilla distant from margin by c. 0.1 × its length, larger than anterior sternal sigilla. Sternal sigilla ( Fig. 15B View FIG ): anterior almost round, slightly smaller than medium; posterior c. 2× larger; all distant from margin by c. 1× its length. Measurements: palp: femur 2.34/ patella 1.32/ tibia 1.51/ tarsus 1.46/ total 6.63; legs: I: femur 3.56/ patella 2.25/ tibia 2.42/ metatarsus 2.13/ tarsus 1.44/ total 11.80; II: 3.16/ 2.02/ 2.10/ 2.00/ 1.54/ 10.82; III: 2.70/ 1.81/ 1.50/ 1.85/ 1.55/ 9.41; IV: 3.53/2.05/2.34/ 3.12/ 1.27/ 12.31. Spination: palp: tibia: v0-2-0-3ap; tarsus: r1i-0-0-0; legs: femora: I: d1p sap; II-IV: 0; patellae: I, II: 0; III: p1-1-1, r0-1-0; IV: r0-1-0; tibiae I, II: 0; III: d0-1, v2ap, p1-1, r-0-1s-0; IV: v2ap, p1i-1i, r1s-1s; metatarsi: I: v1ap; II: v1r-1r-1p-0-2ap; III: d1r-1r-1p-2-0-2, v2-2-0-3ap, p1-1-1-1; IV: d0-1r-1p-2-0-2, v2-0-1p-1r-1p-3ap, r1s-1s-0, p1-1-1-0. Metatarsal preening combs: I: 2VP thin setae; II: 4VP in one line, 4VR in two lines; III: 4VP, 5VR; IV: 4VP, 4VR, III, IV in one line. Tarsi I-IV rigid. Scopulae on tarsi I divided by 2-3 rows of setae, II by 4 rows, III, IV divided by 8 rows of thicker setae; palp and I, II dense and symmetric; III, IV light, only lateral sides. Scopulae on 4/5 of metatarsi I and 2/5 on II, divided by 1-2 rows of thicker setae on leg I and 2-3 on II; III, IV absent. STC with double row of teeth: I: 4, 5, 5, 4; II: 4, 5, 5, 5; III: 4, 6, 6, 4; IV: 6, 7, 7, 6. ITC on tarsi III, IV. Palpal claw with 3 teeth on promargin. Tricobothria with rounded, elevated bases. Four spinnerets ( Fig. 15D View FIG ): PMS 0.38 long, with pumpkiniform spigots on apical 2/3. PLS: basal segment 0.89, median 0.58, apical triangular, short, 0.35 long, with wide band of pumpkiniform spigots on inner edge of all segments. Spermathecae with two independent bases on each side ( Fig. 16 View FIG ); the external side has an elongated basal dome with one globose receptaculum arising from the median area; the internal side has an elongated basal dome not presenting a receptaculum; both very sclerotized ( Fig. 16 View FIG ).

VARIATION. — Males (n = 15): total length 8.26-10.94; carapace 3.71-5.10 long; labium with 0-2 cuspules; maxillae with 46-58 cuspules, sometimes elongated.

DISTRIBUTION. — Known only from the type locality, Fazenda Experimental Edgárdia, Botucatu, São Paulo state, Brazil.

HABITAT. — These spiders were collected by pitfall traps in ecotonal zones between seasonal forest (Cerrado) and Atlantic Forest ( Fig. 17A, B View FIG ), in Fazenda Experimental Edgárdia, where both vegetation types are present. In addition, they were also captured in restoration and pasture areas, which have similar local conditions to Cerrado formations, indicating that the species probably also occur in strictly Cerrado areas, as S. bodoquena Ghirotto & Indicatti , n. sp.

IBSP

Instituto Biologico de Sao Paulo

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro

MCTP

Museu de Ciencias

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Nemesiidae

Genus

Stenoterommata