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How large can the largest caecilian species grow?

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Zoom in on the serpentine locomotion of the limbless, amphibious caecilian over soil — Gymnophiona Caecilian moving over soil.

The largest known species of caecilian is Caecilia thompsoni, which can reach a length of 152 cm (about 60 inches) or 1.5 metres (5 feet). While many species within the genus Caecilia exceed 1 metre in total length, these limbless amphibians vary significantly in size, with some of the smallest species measuring only about 90 to 114 mm in length.12