Mesabolivar tandilicus ( Mello-Leitão, 1940 ),

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: 402

publication ID

http://dx.doi.org/10.11646/zootaxa.3682.3.1

publication LSID

lsid:zoobank.org:pub:E9A4588C-DADD-4E49-BE1F-3C4B63C070FB

persistent identifier

http://treatment.plazi.org/id/A03587D2-FFC1-E809-FF7C-E4464D72F8B2

treatment provided by

Plazi

scientific name

Mesabolivar tandilicus ( Mello-Leitão, 1940 )
status

 

Mesabolivar tandilicus ( Mello-Leitão, 1940) 

Figs 1–14View FIGURES 1 – 10View FIGURES 11 – 14

Litoporus tandilicus Mello-Leitão, 1940: 9  –10, figs 10–12, (Syntypes: two females, one without epigynum, and one male without palps and chelicerae from Tandil, Buenos Aires, Argentina, XII. 1938, M. Birabén leg., in Museo de La Plata, number 14275 examined); Mello-Leitão, 1944: 312.

Mesabolivar tandilicus: Huber, 2000: 214  –215, figs 828–829; Platnick, 2012.

Notes. The female syntypes of M. tandilicus  were redescribed by Huber (2000) but the male syntype was found to be severely damaged, lacking chelicerae and palps ( Huber, 2000). The original description ( Mello-Leitão, 1940) does not present useful drawings of the male genitalia. The female Uruguayan specimens were compared with the female types, and the corresponding males were used for the redescription.

Diagnosis. The male can be distinguished from congeners by the position of the prolateral cheliceral apophysis ( Figs 1–3View FIGURES 1 – 10) combined with the subdivided and membranous tip of the procursus ( Figs 4–6View FIGURES 1 – 10). The female can be distinguished from congeners by the low epigynum ( Fig. 9View FIGURES 1 – 10), the anterior position of the epigynal pocket and the pair of small posterior apophysis ( Figs 8–9View FIGURES 1 – 10).

Description. Male (FCE 1151). Total length 1.95, carapace width 0.9; leg I: 17.4 (4.9 + 0.4 + 4.6 + 6.1 + 1.4), tibia II: 2.9, tibia III: 2.2, tibia IV: 2.9, tibia I L/d: 42. Carapace yellow with a dark dorsal longitudinal stripe; sternum yellow. Thoracic groove distinct. Eight eyes on a slightly elevated area; PME-ALE distance about 90 % of PME diameter. Chelicerae uniformly light brown, basal segment with long and pointed proximal prolateral apophysis, with tip curved ventrally, proximally perpendicular to chelicerae ( Figs 1–3View FIGURES 1 – 10). Palp as in Fig. 4View FIGURES 1 – 10. Coxa with retrolateral apophysis truncated ( Fig. 4View FIGURES 1 – 10). Femur with retrolateral proximal apophysis small and rounded ( Fig. 4View FIGURES 1 – 10). Procursus brown, narrow and curved towards dorsally ( Fig. 4View FIGURES 1 – 10), with two prolateral hairs. Procursus tip distinct, several membranous projections ( Figs 5–6View FIGURES 1 – 10). Bulb simple, without transparent projection, embolic division membranous ( Fig. 7View FIGURES 1 – 10). Legs yellowish-brown; without spines, without modified hairs. Tarsus I with 22 pseudosegments. Abdomen almost globular, yellow with some darker lateral spots.

Female. Redescribed by Huber (2000: 214–215, figs 864–868).

Distribution. Known from northeastern Argentina and Uruguay ( Fig. 41View FIGURE 41).

New records. URUGUAY: Treinta y Tres: Santa Clara de Olimar (32 ° 55 ʹS, 54 ° 58 ʹW), 23, 2Ƥ, 09.II. 1960, L. Zolessi leg., under stones (FCE 655); Río Negro: Fray Bentos, near bridge "General San Martín" (33 °07ʹ 57 ʺS, 58 ° 17 ʹ 44 ʺW), 43, 3Ƥ, 16.XII. 2008, A. Laborda leg. (FCE 2843); Canelones: Rincón del Colorado, INIA Las Brujas (34 ° 37 ʹ 59 ʺS, 56 ° 19 ʹ 59 ʺW), 13, 6Ƥ, 07.X. 2004 (FCE 1778, 1132, 2831, 2832, 2833); 13, 2Ƥ, 23.X. 2004 (FCE 1182, 1151); 1 Ƥ, 09.XI. 2004 (FCE 1409); 1 Ƥ, 25.XI. 2004 (FCE 1534); 13, 5Ƥ, 11.XII. 2004 (FCE 1637, 1653, 1665, 1678); 1 Ƥ, 27.XII. 2004 (FCE 1784); 1 Ƥ, 12.I. 2005 (FCE 2069); 13, 13Ƥ, 1 j, 02.II. 2005 (FCE 3048, 3056, 3085, 3105, 3080, 3096; IBSP 163027); 1 Ƥ, 19.II. 2005 (FCE 2834); 13, 07.III. 2005 (FCE 3287), all collected by M. Simó.

Natural history. Most of the specimens collected in Uruguay were sampled with pitfall traps in grassland areas and agroecosystems, suggesting a ground-level habitat.

INIA

Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria

IBSP

Instituto Biologico de Sao Paulo

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Pholcidae

Genus

Mesabolivar

Loc

Mesabolivar tandilicus ( Mello-Leitão, 1940 )

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

Mesabolivar tandilicus:

Huber 2000: 214
2000
Loc

Litoporus tandilicus Mello-Leitão, 1940 : 9

Mello-Leitao 1944: 312
Mello-Leitao 1940: 9
1940