In addition to the other necessities like a satellite smart phone, a GPS device with a "come get me button", proper clothing including a stylish camo cap, water and some purification fixings, a knife or two, insect repellent and netting, sleeping and cooking gear, proper food requirements and coffee maker, portable generator and fuel, various other items required for civilized jungle exploration and a support team to insure mobility I would bring a Glock 17 if limited to a semiautomatic pistol. Glock and 9 mm are ubiquitous in jungles of all kinds.
CDW4ME I would also prefer have a "mouse gun" or two stashed in a pocket and do my best to avoid situations and critters best handled with a long gun.