The worm Olavius algarvensis (IMAGE)

Max Planck Institute for Marine Microbiology

The worm Olavius algarvensis

Caption

The gutless marine worm Olavius algarvensis (shown here alongside some grains of sand) is only about two centimeters long and has neither mouth nor gut; it is completely dependent on its bacterial symbionts.

Credit

Alexander Gruhl / Max Planck Institute for Marine Microbiology

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