Mesabolivar camussi, Machado & Yamamoto & Brescovit & Huber, 2007

Machado, Éwerton O., Yamamoto, Flávio U., Brescovit, Antonio D. & Huber, Bernhard A., 2007, Three new ground living pholcid species (Araneae: Pholcidae) from Parque Estadual da Cantareira, São Paulo, São Paulo, Brazil, Zootaxa 1582 (1), pp. 27-37 : 30-32

Mesabolivar camussi n. sp.

( Figs. 15–28 , 41–43 )

Mesabolivar sp. 2 : Astrin, Huber, Misof & Klütsch 2006: 444.

Types. Male holotype from Parque Estadual da Cantareira (23° 25’ S; 46° 37’ W), São Paulo, São Paulo, Brazil, 14–19.XI.2004, F. Yamamoto col. with pitfall traps, deposited in IBSP 62399. Female paratype, same data as holotype, 28.VII–02.VIII.2004 deposited in IBSP 62398 .

Etymology. The specific name is a noun in apposition, derived from the Tupi word for “jar”.

Diagnosis. The male is distinguished from congeners by cheliceral armature, with a pair of long and pointed proximal median apophyses and a pair of proximal small protrusions ( Figs. 16–18 ), by the shape of the procursus ( Figs. 19–20 ), with its unique ventral-prolateral flap-shaped apophysis at the tip ( Figs. 21–22 , 42 ) and by the spherical retrolateral femur apophysis ( Fig. 19 ). The female is distinguished by the anterior position of the epigynal pocket combined with the protuberant pair of ventral apophyses in the epigynum ( Figs. 25–27 ) and by the peculiar shape of the pore plates ( Fig. 28 ).

Description. Male (Holotype). Total length 2.5, carapace width 1.1; leg I: 27.1 (6.5 + 0.4 + 6.9 + 11.5 + 1.8), tibia II: 4.2, tibia III: 2.8, tibia IV: 4.3, tibia I L/d: 68. Habitus as in fig. 15. Carapace light brown; sternum light ochre. Distinct thoracic groove. Eight eyes on elevated ocular area ( Fig. 15 ); distance PME–ALE about 83% of PME diameter. Chelicerae light brown, basal segment of chelicerae with a medium-sized median pair and a small lateral pair of apophyses ( Figs. 16–18 , 41 ). Palps as in figs. 19–24. Coxa with distinct retrolateral apophysis ( Fig. 19 ). Femur proximally with a distinct spherical retrolateral apophysis ( Fig. 19 ). Procursus dark brown, with four median prolateral hairs. Distinct tip of procursus, with a ventral-prolateral flap-shaped apophysis at the tip ( Figs. 21–22 , 42 ). Bulb with small transparent projection ( Figs. 23–24 ), embolar division of bulb membranous at the end ( Figs. 23–24 ). Legs light brown; without spines, vertical or curved hairs. Tarsus I with approximately 22 pseudosegments. Opisthosoma globular, pale green, with some lateral bluish-spots ( Fig. 15 ).

Female (Paratype IBSP). Total length 1.38, carapace width 0.8; leg I: 20.2 (5.1 + 0.4 + 5.2 + 7.8 + 1.8), tibia II: 3.4, tibia III: 2.3, tibia IV: 3.4, tibia I L/d: 40. Habitus as in fig. 15. In general very similar to male. Tarsus I with approximately 22 pseudosegments. Epigynum brown, elevated, with a small, very anterior, medium-sized median pocket, with a pair of prominent ventral apophyses, with several spines on the post-epigynal plate ( Figs. 25, 27 , 43 ). Internal genitalia with two large and strongly sclerotized curved pore plates with median indentation ( Fig. 28 ). The two sclerites visible in ventral view in the post-epigynal membranous area are part of the internal arc ( Figs. 25; 28 ).

Variation. Two males: carapace width 1.1–1.3; tibia I: 6.9–7.8. Eight females: carapace width 0.8–1.1; tibia I: 4.1–5.2.

Other material examined. Brazil, São Paulo : São Paulo (Parque Estadual da Cantareira, 23° 25’ S; 46° 37’ W), 1♀, 14–19.XI.2004 ( IBSP 62400 ); 1♂, 4♀ ( IBSP 62393–62397 ), 1♀ ( MZSP), 02–07.II.2005; 1♂ ( IBSP 62406 ), 1♀ ( ZFMK), 12–17.V.2005. Parque Estadual da Cantareira , unspecified location near park entrance, 20.XII.2003 (B.A.Huber), 1♂ in 80% ethanol, 3♂, 7♀ in 100% ethanol ( ZFMK) .

Distribution. Known only from type locality.

Note. This species ( Mesabolivar sp. 2 in Astrin et al. 2006) is also genetically clearly different from M. mairyara Machado, Brescovit, Candiani & Huber, 2007 (M. sp. 3; p-distance: 19,2–19,5% for 16S rRNA, 16,0–16,7% for CO1, Astrin et al. 2006).

Figures

FIGURES 15–28. Mesabolivar camussi n. sp. 15. Male, lateral view; 16–18. Chelicerae, lateral, dorsal, and frontal views. 19–20. Left male palp, retrolateral and prolateral views; 21–22. Tip of left procursus, prolateral and retrolateral (slightly dorsal) views; 23–24. Left bulb, prolateral and retrolateral views. 25–28. Epigynum, ventral, anterior, lateral, and dorsal views. Scale lines: 0.5 mm; except in figs. 21–22: 0.25 mm.

FIGURES 41–43. Mesabolivar camussi n. sp. scanning electron micrographs. 41. Male chelicerae, frontal view; 42. Tip of procursus, retrolateral view, 43. Epigynum, anterior view. Scale lines: figs. 41–42: 0.25 mm; fig. 43: 20 µm