Claim: Poropuntius opisthoptera is classified in the chordata phylum, which are bilaterally symmetric and possess a notochord.
Evidence: Phylum: Chordata During some period of their life cycle, chordates possess a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail: these four anatomical features define this phylum. Chordates are also bilaterally symmetric, and have a coelom, metameric segmentation, and circulatory system.