That looks to be a male Calumma ambreense (the picture has got strange tinting). Calumma ambreense is a close relative to Calumma globifer.
Best Regards
Jeremy A. Rich
I wrote my original response down wrong. I apologize. Spiders are an order in the class Arachnids.
Spiders, Scorpions and Harvestmen are all from the class of Arachnids. That means all three are Arachnids.
You are correct not all Arachnids are spiders.
Best Regards
Jeremy A. Rich
The picture looks to be a "Ankify" Furcifer pardalis local. While the name suggests an "Ambanja" Furcifer pardalis local.
Your chameleon looks to be coming from a great Furcifer pardalis local of the two.
Best Regards
Jeremy A. Rich