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CHARACTER 5: Male palpal bulbs. Number of keels, size and arrangement. 

(terminology of male palpal bulb structures follows Bertani, 2000) 


Two subequal keels PS, PI (Grammostola, Homoeomma, Paraphysa, Plesiopelma and related genera) = 1.


 FIGURE: Homoeomma sp., Chile. Right male palpal bulb, prolateral view.

Three unequal, almost parallel keels (one or two clearly wider) = 2.


 FIGURE: Acanthoscurria geniculata (C. L. Koch, 1842) or A. brocklehursti F. O. P.-Cambridge, 1896, locality unknown. Left male palpal bulb, prolateral view.

Two peripheric keels PS, A = 3.


FIGURE: Theraphosa blondi (Laterille, 1804), locality unknown. Male palpal bulb.


Three apical convergent keels PS, PI, A or PS, R, A (two keels clearly developed; Brachypelma, Pamphobeteus) = 6.


FIGURE: Brachypelma fossorium Valerio, 1980, Costa Rica, Guanacaste province. Male palpal bulb.

FIGURE: Megaphobema robustum (Ausserer, 1875). Male palpal bulb with fused PS and A keel, prolateral view.