Classification:
Phylum: Chaetognatha
Class: Sagittoidea
Scientific Name: Spadella cephaloptera
Common Name: Arrow Worm
Class: Sagittoidea
Scientific Name: Spadella cephaloptera
Common Name: Arrow Worm
General Characteristics:
Arrow worms are small marine invertebrates that have a long, lean body with lateral and caudal fins. They are transparent in coloration. They have chitnous spines around their mouth, which can be retracted under a hood. They feed on other small invertebrates such as copepods and elevins. They are hermaphroditic and fertilization is internal. Development in direct.
Habitat:
Coastal watgers of the Mediterranean Sea and Atlantic Ocean.
Importance to Humans:
Arrow worms are of no known importance to humans, but they have been subject to recent studies to try and determine their correct classification.
Sources:
"Spadella Cephaloptera". Genoscope. Retrieved from: http://www.cns.fr/spip/-Spadella-cephaloptera,347-.html.