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Which caecilian species are among the smallest?

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

Among the caecilians (order Gymnophiona), which are long, slender, and limbless amphibians adapted for burrowing, the species Idiocranium russeli is recognized as one of the smallest. It reaches a length of only 90 to 114 mm (3.5 to 5 inches).1