Mesabolivar charrua, Machado, Éwerton O., Laborda, Álvaro, Simó, Miguel & Brescovit, Antonio D., 2013

Machado, Éwerton O., Laborda, Álvaro, Simó, Miguel & Brescovit, Antonio D., 2013, Contributions to the taxonomy and distribution of the genus Mesabolivar in southern South America (Araneae: Pholcidae), Zootaxa 3682 (3), pp. 401-411 : 404-408

Mesabolivar charrua new species

Figs 15–30 .

Mesabolivar sp.: Laborda & Simó, 2011: 128.

Holotype: Male holotype from Sierra de Ánimas, Maldonado, Uruguay, (34° 42' S 55° 19' 59'' W), 18.VI.1950, L.C. de Zolessi leg., in FCE (2361). Paratypes: female (FCE 2361) same data as holotype; 1 male and 1 female ( IBSP 161828) Gruta del Palacio, Flores, Uruguay, (33° 12' S 57° 05'W), 23.IV.1995, A. Olmos leg.; 1 male and 1 female (MCN 19339), Triunfo (29°56ʹ34ʺS, 51°43ʹ4ʺW), Rio Grande do Sul, Brazil, 25.I.1990, A. D. Brescovit leg.

Etymology. The specific name is a noun in apposition honoring the main indigenous tribe that inhabited the actual Uruguayan territory in the past.

Diagnosis. Similar to M. cyaneomaculatus (Keyserling, 1891) , the male sharing the median apophysis at prolateral edge of chelicerae and the general shape of procursus, distinguished from congeners by tip of procursus, which has flap-shaped prolateral apophysis and retrolateral-distal membranous projection ( Figs 18–19 ). Female can be distinguished from congeners by presence of one pair of lateral projections combined with position of small epigynal pocket, located in posterior edge of epigynum ( Fig. 22 ), and by internal genitalia, with porous plates strongly connected in anterior region ( Fig. 24 ).

Description. Male (Holotype). Total length 3.9, carapace length 1.3, clypeus 0.3, carapace width 1.4; leg I: 34.7 (9.0 + 0.6 + 8.8 + 15.0 + 1.3), tibia II: 5.8, tibia III: 4.6, tibia IV: 6.0, tibia I L/d: 44. Carapace light brown with longitudinal dark stripe, sternum light brown. Distinct thoracic groove. Eight eyes on slightly elevated ocular area; distance PME-ALE about 80% of PME diameter. Chelicerae light brown, basal segment with almost distal medial apophysis on prolateral edge ( Fig. 15 ). Palps as in Fig. 16 . Coxa with distinct retrolateral apophysis ( Fig. 16 ). Femur with proximal rectangular apophysis retrolaterally ( Fig. 21 ). Procursus light brown, curved towards dorsally, with dorsal microspinulation and two prolateral spines ( Fig. 17 ). Distinct tip of procursus, with flapshaped prolateral apophysis slightly curved dorsally, and retrolateral-distal membranous projection ( Figs 18–19 ). Bulb simple, without transparent projection ( Fig. 20 ), embolic division long and straight, membranous distally, sclerotized prolateral stripe present ( Fig. 20 ). Legs light brown; without spines, vertical or curved hairs. Retrolateral trichobothrium on tibia I at 1.6%. Tarsi without serrated ventral spines, tarsus I and approximately 25 pseudosegments. Abdomen oval, greenish-blue.

Female (Paratype FCE 2361). Total length 3.1, carapace length 1.0, carapace width 1.3; leg I: 17.3 (7.0 + 0.6 + 6.8 + 10.1 + 1.8), tibia III: 3.6, tibia II and IV missing, tibia I L/d: 38. In general, very similar to male. Epigynum brown, slightly elevated, with one pair of lateral projections, small epigynal pocket located at posterior edge of epigynum ( Figs 22–23 ). Internal genitalia with two porous plates approximately triangular, largely connected by sclerotized rod ( Fig. 24 ).

Variation. Three males: carapace width 1.3–1.4; tibia I: 8.8–9.6. Three females: carapace width 1.2–1.3; tibia I: 6.8–9.8.

Distribution. Southern Brazil and Uruguay ( Fig. 41 ).

Other material examined. BRAZIL: Santa Catarina: Araranguá, Morro dos Conventos (28°56ʹ0 6ʺS, 49°29ʹ0 9ʺW), 13, 2Ƥ, 18.II.1985, A.D. Brescovit leg. (MCN 13237); Rio Grande do Sul: Machadinho, Linha do Tigre (27º34'01"S, 51º40'04"W), 2Ƥ, 09.V.2001, R. Ott. & L. Moura leg. (MCN 33885); Bom Jesus (28º40'04"S, 50º25'00"W), 1Ƥ, 02.II.1976, P. C. Braun leg. (MCN 3500); Arroio do Tigre, Itaúba (29°19'58"S, 53°05'34"W), 53, 3Ƥ, 05.IV.1978, E.H. Buckup leg. (MCN 7844); 13, 05.IV.1978, H. Bischoff, (MCN 7857); 13, 06.IV.1978, E. H. Buckup leg. (MCN 7822); 33, 1Ƥ, 06.IV.1978, C.J. Becker leg. (MCN 7911); 13, 10.IV.1978, H. Bischoff leg. (MCN 7892); 33, 1J, 17.IV.1978, A. A. Lise leg. (MCN 7993); 23, 1J, 17.IV.1978, M.H. Galileu leg. (MCN 7999); São Francisco de Paula, Barragem Passo do Inferno, (29°26ʹ52ʺS, 50°35ʹ2ʺW), 23, 21.II.2001, R. Ott leg. (MCN 33736); Floresta Nacional de São Francisco de Paula, 23, 2Ƥ, IV.2001, R. Baldissera leg. (MCN 35224); Usina Hidrelétrica Passo do Inferno, 1Ƥ, 19.XI.1997, E.H. Buckup leg. (MCN 28870); Torres (29°20ʹ6ʺS, 49°43ʹ37ʺW), 1Ƥ, 21.XI.1976, A.A. Lise leg. (MCN 4846); Canela (29º21'56"S, 50º48'56"W), 13, 1Ƥ, 2.XII.1973, A.A. Lise leg. (MCN 2221); 13, 3Ƥ, 20.III.1976, A.A. Lise leg. (MCN 3806, 3825); 1Ƥ, 21.IV.1973, A.A. Lise leg. (MCN 1412); Barragem Canastra, 1 3, 20.II.2001, R. Ott leg. (MCN 33737); Maquiné, Estação Experimental da FEPAGRO (29º39’S, 50º12’W), 3Ƥ, 06–08.III.1998, L.A. Moura leg. (MCN 29036); Montenegro (29º41'19"S, 51º27'40"W), 33, 1Ƥ, 1J, 07.VII.1977, A.A. Lise leg. (MCN 6082); Gravataí, Mato Alto, (22º56'36”S, 50º59'38”W), 1Ƥ, 30.XI.1992, A. D. Brescovit leg. (MCN 22583); Morungava, 23, 02.II.1992, A. D. Brescovit leg. (MCN 21981); Porto Alegre (30°1ʹ58ʺS, 51°13ʹ48ʺW), 1Ƥ, 11.V.1986, R. Baião leg. (MCN 15905); 13, 14.I.1981, M. Ribeiro leg. (MCN 9460); 1Ƥ, 15.VIII.1976 P. Buckup leg. (MCN 4424); 13, 3Ƥ, 18.I.1992, M.A.L. Marques leg. (MCN 21964); 13, 1Ƥ, 23.VII.1963, Hartlieb & Pacini leg. (MCN 1244); Lomba do Pinheiro, 13, 18.VI.1978, A.G. Pereira leg. (MCN 8154); Parque Estadual Delta do Jacuí, Ilha Grande dos Marinheiros, 13, 1Ƥ, 08.VII.1999, A.B. Bonaldo leg. (MCN 31336); 13, 08.X.1998, A.B. Bonaldo leg. (MCN 29482); 1Ƥ, 10.VII.1999, A.B. Bonaldo leg. (MCN 31448); 1Ƥ, 27.X.1998, A.B. Bonaldo leg. (MCN 30098); Ponta Grossa, 1Ƥ, 2002, V. Buckup leg. (MCN 35213); Santa Maria, 13, 1J, 09.X.1988, M. Hoffmann leg. (MCN 17923); Triunfo, Ilha dos Dorneles, (29°56ʹ34ʺS, 51°43ʹ4ʺW), 13, 23.VII. 1986, A.D. Brescovit leg. (MCN 15406); Eldorado do Sul, Parque Estadual Delta do Jacuí (30°5ʹ2ʺS, 51°36ʹ57ʺW), 1 Ƥ, 05–07.I.2000, A.B. Bonaldo leg. (MCN 31982); Ilha Grande dos Marinheiros, 1Ƥ, 23.II.1999, L.A. Moura leg. (MCN 30471); Charqueadas, Capão da Roça (29°57ʹ18ʺS, 51°37ʹ31ʺW), 23, 1Ƥ, 25.IX.2003, R. Ott leg. (MCN 37238); São Jerônimo (29°57ʹ32ʺS, 51°43ʹ19ʺW), 13, 03.VI.1982, C.J. Becker leg. (MCN 10451); Tapes, Fazenda São Miguel (30°40ʹ22ʺS, 51°23ʹ45ʺW), 33, 14.V.2003, R. Araujo leg. (MCN 35635); Viamão, (30°4ʹ51ʺS, 51°1ʹ22ʺW), 1Ƥ, 12.X.1962, Hartlieb & Krebs leg. (MCN 1192); 13, 4Ƥ, 15.XI.1963, C. A. Hartieleb leg. (MCN 1178); 23, 2Ƥ; 1J, 23.V.1963, Hartlieb & Amato leg. (MCN 1104); Médio Arroio Pesqueiro, 3Ƥ, 30.V.2000, A.B. Bonaldo leg. (MCN 33185); Morro do Côco, 13, 09.VII.1982, A. A. Lise leg. (MCN 11302); Palmares do Sul, Buraco Quente (30º15'28"S, 50º30'35"W), 1Ƥ, 11.XI.2003, Equipe PROBIO leg. (MCN 36686); Lagoa do Casamento, Ilha Grande, 23, 2Ƥ, 08.IV.2003, Equipe PROBIO leg. (MCN 35457, 35488); Barra do Ribeiro (30º17'28"S, 51º18'04"W), 13, 11.XI.1976, M.L. Tavares leg. (MCN 4781); Fazenda Boa Vista, 13, 12.V.2003, Equipe PROBIO leg. (MCN 35563); Mariana Pimentel (30°21ʹ10ʺS, 51°34ʹ58ʺW), 1Ƥ, 22.VIII.1993, A.F. Francischini leg. (MCN 23920); Arroio dos Ratos, Fazenda Recanto da Figueira (30º04'38"S, 51º43'45"W), 13, 1J, 01.VIII.1986, M. Rosenau leg. (MCN 15511); Dom Feliciano, Fazenda Chapada (30º42'15"S, 52º06'27"W), 1Ƥ, 18–19.III.2000, A.B. Bonaldo leg. (MCN 32239); Pelotas (31°46ʹ19ʺS, 52°20ʹ34ʺW), 13, 11.III.2001, E. Rodrigues leg. (MCN 33795); 13, 15–16.III.1996, L.A. Moura leg. (MCN 27474). URUGUAY: Treinta y Tres: Quebrada de los Cuervos, Arroyo Yerbal Chico (33°10ʹ0 5ʺS, 54°27ʹ45ʺW), 13, 12.XII.2005, A. Laborda & M. Simó leg. (FCE 2836); Flores: Trinidad, Gruta del Palacio (33°12ʹ29ʺS, 57°05ʹ47ʺW), 1Ƥ, 23.IV.1995, A. Olmos leg. (FCE 2835); Rocha: Cebollatí, San Luis (33°16ʹ0 7ʺS, 53°47ʹ46ʺW), 3Ƥ, 1j, 13.I.1957, (FCE 656); Laguna Negra, Monte de Higuerones (34°03ʹS, 53°39ʹ59ʺW), 93, 6Ƥ, 2j, 17.VI.2007, A. Laborda leg. (FCE 2838); Lavalleja: Cerro Arequita (34°15ʹS, 55°16ʹ59ʺW), 2Ƥ, 23.I.1998, Simó, Vazquez, Toscano & Useta leg. (FCE 2837); Mina Valencia (34°25ʹ0 6ʺS, 55°16ʹ15ʺW), 1Ƥ, 26.VI.1966, L.C. Zolessi leg. (FCE 654); Maldonado: Cerro Betete (34°39ʹ51ʺS, 55°20ʹ36ʺW), 1Ƥ, 15.XI.1960, L.Z./C.S.C./C.S.M. leg. (FCE 663); Sierra de Ánimas (34°42ʹS, 55°19ʹ59ʺW), 1Ƥ, 3j, 18.VI.1950, LC. Zolessi leg. (FCE 659); Tacuarembó: San Gregorio de Polanco, Ruta 43 (32°33ʹ0 8ʺS, 55°50ʹ0 1ʺW), 1Ƥ, 20.VII.2003, C/M/G/P y T leg. (FCE 1007).

Natural history. This species constructs the webs near the soil in humid sites near water courses and roots of trees.

Figures

FIGURE 41. Known geographic distributions of Mesabolivar tandilicus, M. charrua sp. nov. and M. uruguayensis sp. nov..

FIGURES 15 – 24. Mesabolivar charrua sp. nov.. 15. Male chelicerae, frontal. 16, Male left palp, retrolateral. 17, Procursus, retrolateral slightly dorsal. 18 – 19, Procursus tip. dorsal (18), prolateral (19). 20, Bulb, prolateral. Arrows shows the membranous projection. 21, Male palpal femur, retrolateral. 22 – 24, Epigynum, ventral (22), lateral (23), dorsal (24). Scale: 0.5 mm.

FIGURES 25 – 30. Mesabolivar charrua sp. nov., scanning electron micrographs. 25, Male chelicerae, frontal. 26, Tarsal organ, left palp. 27, Left bulb, retrolateral. 28, Bulb opening detail. 29, Left procursus, prolateral. 30, Left procursus, microspinulation detail.