The word you're looking for is "plesiomorphic" (a comparative word meaning evolved earlier), which is a more scientifically correct term for "primitive." The word primitive can imply less intelligent or "more caveman-like" in human thinking, which is generally not accurate. For example, a lamprey is one of the most plesiomorphic chordates, yet it has been gearing towards its exact niche for many, MANY more years than humans have. So could one say that a lamprey is the more "perfected" animal?
This is why looking at when something evolved - such as colubrids evolving later than boids - is not an accurate judge of how "intelligent" an animal is. Animals evolve to fill certain niches, not because they're "getting smarter." Colubrids evolved because faster snakes could compete with the boids for food, thus filling a niche.








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