Genus Spadella is a type of marine worm that belongs to the phylum Chaetognatha. The Genus Spadella has many synonyms that are used to name these worm-like creatures. Some of these synonyms include the following: Sagitta, Pterosargus, Saccosoma, and Chaetoceros. There are over 30 different species of Genus Spadella, and each one has its own unique set of characteristics and behaviors. These worms are known for their transparent, slender bodies and their ability to swim through the water using their muscular tails. They are often found in deep sea environments and play an important role in the marine ecosystem.