Elongate forms, with the rhynchocoel restricted to the anterior half of the body.
Source: Gibson and Knight-Jones, 1990.
The following taxa of this family occur in the region:
Genus Emplectonema
Genus Nemertopsis
Genus Oerstedia
Genus Tetrastemma
Emplectonema gracile
Emplectonema neesii
Nemertopsis flavida
Oerstedia dorsalis
Tetrastemma candidum
Tetrastemma flavidum
Tetrastemma helvolum
Tetrastemma melanocephalum
Tetrastemma robertianae
Tetrastemma vermiculus