ZOOLOGY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Chaetognatha Arrow worm. Image credit: NOAA A phylum of marine worm-like animals with bodies divided into head, trunk, and tail, also known as arrow worms. The trunk bears lateral fins. Larval chaetognathans are free-swimming; adults are planktonic or tube dwellers. Related category    • ZOOLOGY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP