Mesabolivar embapua, Machado, Éwerton O., Brescovit, Antonio D. & Francisco, Rafael C., 2007

Machado, Éwerton O., Brescovit, Antonio D. & Francisco, Rafael C., 2007, Three new ground dweller Mesabolivar González-Sponga, 1998 (Araneae: Pholcidae) from Blumenau, Santa Catarina, Brazil, Zootaxa 1560, pp. 55-61 : 59

Mesabolivar embapua n. sp.

( Figs. 19–28 )

Types. Male holotype from Parque Natural Municipal Nascentes do Ribeirão Garcia (27o01’– 27o06’ S; 49o04’– 49o10’ W; 290–910 m), Blumenau, Santa Catarina, Brazil, 24.X.2004, R.C. Francisco col. with pitfall traps, deposited in IBSP 62442. Paratype: 1 female, same data as holotype, 18.IV.2004 (IBSP 62443).

Etymology. The specific name is a compound noun in apposition, derived from the Tupi Indian words “ embé ” (superior lip) and “ apuá ” (pointed).

Diagnosis. The males can be distinguished from the congeneric species by the presence of a pair of large and long apophyses on the chelicerae ( Figs. 20–22 ) combined with the procursus shape ( Figs. 23–24 ), with a dorsal apophysis bent to the retrolateral face ( Figs. 23–24 ) and two terminal spines. The female can be distinguished by a projected epigynal plate with a pair of long diverging apophyses, combined with a small rounded pocket ( Figs. 26–27 ).

Description. Male (Holotype): Total length 1.5, carapace width 0.8; leg I: 7.2 (1.8 + 0.3 + 1.9 + 2.6 + 0.6), tibia II: 1.1, tibia III: 1.0, tibia IV: 1.9, tibia I L/d: 24. Habitus as in fig. 19. Carapace light brown; sternum light ochre. Distinct thoracic groove. Eight eyes in an ocular area only slightly more elevated than carapace ( Fig. 19 ); distance PME–ALE about 83% of PME diameter. Chelicera uniformly light brown, basal segment of chelicera with one large and long apophysis with curved tip, approximately perpendicular to the chelicera ( Figs. 20–22 ). Palp as in fig. 23. Palpal coxa with a very pointed retrolateral apophysis ( Fig. 23 ). Femur proximally with a small rounded retrolateral apophysis ( Fig. 23 ). Procursus brown, broad, with a dorsal apophysis bent to the retrolateral face in the distal portion ( Figs. 23–24 ), without prolateral hairs. Distinct tip of procursus, ending in two terminal spines ( Figs. 23–24 ). Bulb simple, with a small transparent projection, embolar division of bulb slender and membranous at the end ( Fig. 25 ). Legs light brown; without spines, vertical or curved hairs. Tarsus I with approximately 11 pseudosegments. Opisthosoma globular, pale green, with some lateral bluish spots ( Fig. 19 ).

Female. (Paratype): Total length 1.7, carapace width 0.8; leg I: 8.1 (2.0 + 0.3 + 2.1 + 2.9 + 0.8), tibia II: 1.1, tibia III: 1.0, tibia IV: 1.8, tibia I L/d: 18. In general appearance very similar to male. Tarsus I with approximately 12 pseudosegments. Epigynum light brown, very elevated, with a pair of ventral prominent divergent projections and with a small oval median pocket, extending internally into a blind wall seen through the translucent integument ( Figs. 26–27 ). Internal genitalia with two oval pore plates ( Fig. 28 ).

Other material examined. None.

Distribution. Known only from type locality.

Figures

FIGURES 19 – 28. Mesabolivar embapua n. sp. 19. Male body, lateral; 20. Chelicerae, frontal; 21. Chelicera, lateral; 22. Chelicerae, dorsal; 23. Left palp, retrolateral; 24. Tip of procursus, prolateral; 25. Left bulb, prolateral view; 26. Epigynum, anterior view; 27. Epigynum, ventral view; 28. Epigynum, dorsal view. Scale lines: 0.5 mm, except fig. 24: 0.25 mm.