Are you a Tarantula hobbyist? If so, we invite you to join our community! Once you join you'll be able to post messages, upload pictures of your pets and enclosures and chat with other Tarantula enthusiasts. Sign up today!
Male P tristis have setae 'spurs' on their first pair of legs that function like those of Mygalomorphae- claspers during mating.
Unlike females, which are docile and play dead when touched, males extremely defensive and will deliver a full envenomation in their bite- which is extremely painful.
Despite its superficial resemblance to kukulcania, these are very close to Pholcidae and along with Desertshrub spiders make up the Lost tracheae clade (Pholcoidea). Venom in this species is quite strong, and painful with an intense numbing effect. fortunately, females are docile with small fangs.
Note the golden ventral patch of setae- this is used to store plant resins for later use and for oviposition.
Without a resin coating, the survival rate of the eggs plummets sharply- with most dehydrating and dying inside the egg, or being predated upon by ants.
THere are probably more in the wood as they actually lay their eggs on dead rotted wood in the wild, and the larvae burrow into it. ironclad beetles do this too