Protimesius bahiensis, Pinto-Da-Rocha, Ricardo & Manzanilla, Osvaldo Villarreal, 2009

Pinto-Da-Rocha, Ricardo & Manzanilla, Osvaldo Villarreal, 2009, Cladistic analysis of the Stygninae and description of a new species of Protimesius Roewer, 1913 (Opiliones: Stygnidae), Zootaxa 2176, pp. 48-56 : 49-52

Protimesius bahiensis sp. nov.

Figs 1–12 , tables 1–2

Type material. Male holotype ( MNRJ 5294), Brazil, Bahia, Ilhéus, Repartimento. Male paratype ( MNRJ 5292), Brazil, Bahia, Ilhéus, Ilha do Barbosa, no collector and date of collection on labels.

Other material examined. One male, badly preserved ( MNRJ 5293), Brazil, Bahia, Ilhéus Ribeira da Fortuna.

Diagnosis. Protimesius bahiensis sp. nov. can be distinguished from the remaining species of the genus by the combination of the male femur IV unarmed and cylindrical; patella IV with a row of dorsal spine-like tubercles, increasing in size distally and tibia IV with one prolatero-dorsal distal spine ( Figs 8–9 ). Etymology. The species name refers to the type locality, and was handwritten in the original label by Mello-Leitão.

Description (holotype male). Measurements. Tables 1–2.

Dorsal scute Holotype MNRJ 5294 Paratype MNRJ 5292 DSL 4.4 4.7 PL 2.0 2.2 APW 3.2 3.1 MDW 4.2 4.2 ID 2.2 2.3 Chelicera

Ba 1.3 1.1 Ha 2.9 3.2 MF 1.6 1.6 Pedipalp

Co 1.6 2.1 Tr 1.9 1.8 Fe 12.8 12.3 Pa 8.5 8.2 Ti 5.3 5.0 Ta 4.8 4.5 Total 34.9 33.8

Holotype MNRJ 5294 Paratype MNRJ 5292

Leg I II III IV I II III IV Tr 0.6 0.7 1.0 1.1 0.5 0.6 0.8 0.8 Fe 5.8 11.5 8.6 11.5 5.6 11.7 8.6 11.4 Pa 1.2 1.7 1.6 1.9 1.0 1.7 1.8 2.3 Ti 3.5 9.0 4.8 6.1 3.3 9.1 4.8 6.6 Mt 5.8? 8.8 13.6 5.6? 9.0? Ta 2.0? 3.4 4.2 2.3??? Total 18.8 – 28.2 38.3 18.3 – – – Dorsum ( Figs 1–3 ). Anterior margin of carapace with four tubercles on each side. Prosoma with a low anterior median prominence, two conspicuous, and several small tubercles; with several lateral tubercles. Eye mounds smooth. Interocular region with small granules. Lateral margins with several tubercles from coxa II to posterior margin of area III. Area I divided, with a large tubercle on each side and a small outer granule; II with one granule on each side; III with two large spines and few posterior small granules. Free tergites finelygranulated.

Venter. Coxa I with a medial row of five tubercles, three apical (anterior largest); II with six–seven medial tubercles, four posterior, three apical; III with seven–eight medial, six-seven posterior, one–three apical; IV irregularly tuberculated. Genital operculum with three granules. Free sternites with a row of small granules each.

Chelicerae ( Figs 1–3 ). Swollen. Segment I smooth; II with one basal, three medial and one small distal teeth; III with two distal teeth.

Pedipalpus. Coxa with one large dorsobasal, two dorsomedial and five ventral tubercles. Trochanter with four ventral tubercles (the proximal the largest). Femur with one ventrobasal tubercle. Tibia with two ventral rows of small granules, mesal IIiIi (2.1.4.3.5; Fig. 5 ); ectal IIiiIi (1=5.2.3=6.4; Fig. 4 ). Tarsus with two ventral rows of small granules, mesal Iiii (1.4.2.5.3; Fig. 5 ); ectal Iiii (1.3.2.4.5; Fig. 4 ).

Legs ( Figs 6–9 ). Coxa I with three dorsal tubercles; II with two (retrolateral fused with a tubercle of coxa III); III with two. Trochanter I–II with three ventral tubercles (proximal larger); III with four–five; IV with four–six ventral tubercles. Femur IV cylindrical and smooth. Patella IV with one prolaterodorsal row of five crescent distal large tubercles and retrolateral distal row of small tubercles, venter with one large distal tubercle ( Figs 6–7 ). Tibia IV with one prolaterodorsal distal spine and one lateroventral distal spine ( Figs 8–9 ). Tarsal segmentation: 7, 14, 6, 7.

Penis ( Figs. 10–11 ). Truncus with four pairs of basal setae; dorsal process well developed; ventral plate with lateral margins concave, distal margin slightly concave; with three pairs of distal setae and one pair of intermediary setae absent.

Coloration. Brown, areas I–III lighter, lateral border of dorsal scute darker.

Female unknown.

Distribution. Only recorded from Bahia, Ilhéus.

Figures

FIGURES 1 – 9. Protimesius bahiensis sp. nov. Holotype male. 1 – 3. Habitus: 1. Dorsal view. 2. Lateral view (paratype). 3. Lateral view (holotype). 4 – 5. Right pedipalpus: 4. Ectal view; 5. Mesal view. 6 – 7. Patella IV: 6. Prolateral view. 7. Retrolateral view. 8 – 9. Leg IV: 8. Dorsal view. 9. Ventral view.

FIGURES 10 – 11. Protimesius bahiensis sp. nov. Holotype male. Distal portion of the penis: 10. Lateral view. 11. Dorsal view. Scale bar 0.25 mm.

FIGURE 12. Strict consensus cladogram (160 steps, consistence index 0.39, retention index 0.69) showing the relationships among Stygninae. Characters follow Pinto-da-Rocha (1997), with the addition of ten new characters (see “ cladistic analysis ”). The matrix is shown on Table 3.