Gnathostomulida Name Meaning: Jaw orifice English Common Name: Jaw worms Major distinguishing characteristics: Approximate number of species described: about 300
Natural History[edit | edit source]
Jaw worms are all aquatic and marine. They live in the sand and mud in shallow coastal waters.
Taxonomy[edit | edit source]
There are two recognized orders within the Phylum Gnathostomulida.
Anatomy[edit | edit source]
The powerfully jawed mouth is just behind the head end and opens into a blind-ending tube. There is no anus. They have no circulatory or respiratory system.
They are hermaphroditic, with one ovary and two testes.
The Fossil Record[edit | edit source]
There is no known fossil record.