Ephebopus cyanognathus

This tarantula looks a lot like the Ephebopus uatuman tarantula, with the main distinguishing feature being the blue chelicerae, though these are lacking in adult males. Adult males are instead a purplish color, and can be distinguished by their palpal bulb.[2] This tarantula has bright golden rings on its legs and pedipalps, which are evident at segments. In adults, the carapace is brown in color with some areas showing a greenish hue. Its opisthosoma is mainly dark brown with a greenish stripe in the center.

Juveniles and spiderlings (slings) have legs that are pinkish to the metatarsus, which is purple in color. The carapace is completely brown in slings, with juveniles having some greenish coloration developing between the brown. While a sling, the opisthosoma is green with a thick yellow line in the center. Juveniles also have this yellow line, though its duller, and the opisthosoma is a greenish-brown.

These tarantulas are found all over French Guiana, they have been found from Trésor Reserve all the way to Saül.[2] When describing their habitat I'll be mainly referring to Trésor Reserve, for the information. In this area it rains yearly about 4m in average, as this is because of the trade winds, which are loaded with humidity from the ocean.[4] In this area this area has 23°C, with very high humidity levels.[5]

This spider is mainly fossorial, but juveniles have been observed to oddly be semi arboreal. When they are young they are known to be defensive, and very nervous, but this gets better with age. When provoked this tarantula will first try to flee, but under persistent provocation it will throw hairs or bite. This tarantula will make burrows, though not as deep as other spiders, making the entrance stronger with whatever they may find, popping of a few centimeters of the surface.[2]