Nemertean Worm (image) Okinawa Institute of Science and Technology (OIST) Graduate University Share Print E-Mail Caption A nemertean worm (Notospermus geniculatus). Left: a contracted worm. Right: an extended worm. The nemertean body is usually highly contractible and extendable. Some nemertean species, such as Lineus longissimus, can reach 30m long. Credit Okinawa Institute of Science and Technology Graduate University Usage Restrictions Images are free for anyone to re-use, and should be credited to OIST. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.