Jannar, a male Xindi-Arboreal.
Xindi-Arboreals are among the most peaceful of the six original Xindi species.
Physiology
In appearance, Arboreals are covered with hair, have long sharp fingernails, dark eyes, and a ridge running from their noses to the back of their heads.
As the third species of Xindi discovered by the crew of Enterprise, it was believed by Doctor Phlox, that this species probably evolved from some sort of arboreal primate. (ENT: "Extinction")
Arboreals are afraid of the water. They are considered to be lethargic by the other Xindi species. They are also extremely calm, even when taken hostage. (ENT: "The Shipment")
Culture and Technology
Arboreals wear belts that seem to indicate their rank. For example, Gralik's assistants wore two belts while he himself wore three. Jannar wore five belts.
Relatively speaking, Arboreal starships were not very powerful; a Xindi-Reptilian starship patrol could easily destroy three Arboreal ships.
See also: Xindi-Arboreal colony
Background
The Xindi-Arboreals were originally referred to as "Xindi-Sloths" during the early production of season three of Star Trek: Enterprise. The novelization of The Xindi calls them "Xindi-Marsupials."