In 1991 an imported specimen came to attention under the label Pamphobeteus exsul. The buyer, Andreas Tinter, recognizing the specimen could not be Pamphobeteus, created a new genus for it, Pseudotheraphosa (aphophysis). In 2001 Rogério Bertani re-examined the species and placed it in Theraphosa, alongside Theraphosa stirmi and Theraphosa blondi.
Native to Venezuela, Theraphosa apophysis is comparable to T. stirmi and T. blondi in size and temperament. Younger instars have pinked-tipped forelegs, with pink fading over subsequent molts. Other colors appear, most notably burgundy red carried mainly by leg and abdominal setae, and reddish purple iridescence in the femurs. Many consider T. apophysis the most beautiful of the genus. It is the least often Theraphosa available for sale.
Various sources report difficulty keeping. Our experience has shown a greater tendency to dehydrate compared to most neotropical terrestrials, similar to that of T. stirmi or T. blondi. As with all tarantulas, spiderlings are more vulnerable than adults. A humidity source whilst limiting exposure to dry room air found in most US homes (40-50% humidity) will put you in good stead with any spiderling. A pinch of substrate held between the fingers should be neither dusty nor wet. Larger specimens can be kept on a substrate gradient, damp at one end, dry at the other. There are many other effective solutions. Again, ventilation should strike a balance between excessive dampness, which encourages microbial growth, and too rapid equilibration with dry room air. We keep spiderlings through adults at 68 -74F. See the entry for T. stirmi for a brief discussion of ideal temperature ranges cited in the literature.
N.b.: (1) The correct pronunciation of ‘apophysis’ is a – pó – phy – sis, accent on the second syllable: [LINK].