Bayana, Pérez-Miles & Costa & Oca, 2014

Pérez-Miles, Fernando, Costa, Fernando G. & Oca, Laura Montes de, 2014, Bayana labordai, new genus and species of Nemesiidae (Araneae: Mygalomorphae) from Northern Uruguay and Southern Brazil, Journal of Natural History (J. Nat. Hist.) 48 (31 - 32), pp. 1937-1946 : 1938-1940

Bayana gen. nov.

( Figures 1 – 7 )

Type species

B. labordai sp. nov.

Diagnosis

Bayana gen. nov. resembles Neostothis , Pycnothele , Lycinus Thorell, 1894 and Diplothelopsis Mello-Leitão, 1938 by the dense pubescence in the body ( Figure 1 vs. Figures 8, 18 in Lucas and Indicatti (2010)). Resembles Pycnothele also by the excavation in male palpal tibia and in the supraspermathecal chamber of females but differ from this genus in the palpal bulb morphology with low keels, embolous long and excavation in male palpal tibia less deep; females differ in the tubular morphology of spermathecae and in the absence of apical scopulae on tibiae I – II. Resembles Neostothis in the palpal bulb morphology with a long embolous and in the presence of supraspermathecal chamber in females, but differs from this genus in the presence of palpal bulb keels, male palpal excavation on tibia I and the morphology of spermathecae without fundus differentiated. Bayana differs from Lycinus and Diplothelopsis in the occurrence of thin setae in male cymbium ( Figure 2a ), absence of prolateral spines on female patella IV ( Figure 2b ) and PE line recurved ( Figure 2c ). Differs from Chilelopsis Goloboff, 1995 in the absence of strong, elongated spines on prolateral metatarsus IV; from Flamencopsis Goloboff, 1995 in the presence of scopula on all legs and absence of spines on female patella IV. Resembles Chaco Tullgren, 1905 in the palpal bulb morphology but differ from this genus in the absence of male tibial apophysis bearing spines ( Figure 2d ) and non-differentiated spermathecae fundus in females ( Figure 6 ). Bayana differs from Acanthogonathus Karsch, 1880 in the absence of male tibial apophysis and non differentiated spermathecae fundus in females; from Rachias Simon, 1892 in the absence of thickened setae delimiting male scopulae of tarsus IV and non reduced teeth on STC IV; from Stenoterommata Holmberg, 1881 by the dense pubescence in the body, and in the male palpal bulb abruptly tapered to embolus ( Figures 4a, b ).

Etymology

Bayana is a noun in apposition taken from the Uruguayan argot and makes reference to the habitants of the boundary between Brazil and Uruguay; the gender of Bayana is feminine.

Description

See description of the type-species.

Figures

Figure 1. Bayana labordai sp. nov., habitus of the female.

Figure 2. (A–D) Bayana labordai sp. nov., (A) male palp showing thin setae on cymbium, ventral view; (B) female patella IV, showing the absence of spines, prolateral view; (C) female ocular area; (D) male tibia I showing the absence of tibial apophysis or megaspines, ventral view.

Figure 3. (A–C) Bayana labordai sp. nov., (A) male body, dorsal view; (B) male sternum, labium and endites, ventral view; (C) male tarsus IV flexible (lateral view).

Figure 4. (A–B) Bayana labordai sp. nov., left male palpal bulb; (A) dorsal view; (B) ventral view (Scale 1 mm).

Figure 5. (A–B) Bayana labordai sp. nov., (A) female sternum, ventral view; (B) female palpal femur strongly curved, dorsal view.

Figure 6. Bayana labordai sp. nov., female spermathecae, dorsal view (Scale 1 mm).

Figure 7. Bayana labordai sp. nov., female at the burrow entrance.