Sagittiferidae
Sagittiferidae Symsagittifera schultzei Scientific classification Kingdom: Animalia Phylum: Xenacoelomorpha Class: Acoela Order: not assigned Family: Sagittiferidae Genera Antrosagittifera Convolutriloba [1] Praesagittifera Sagittifera Symsagittifera Sagittiferidae is a family of Acoela. Contents 1 Systematics 2 Characteristics 3 Species 3.1 Antrosagittifera 3.2 Convolutriloba 3.3 Sagittifera 3.4 Symsagittifera 4 References Systematics The family is divided into five genera ( see taxobox ) and contains about 20 species (Turbellarian taxonomic database, 2006). The affinities of the genera are as yet unclear. Some biologists prefer to exclude the genus Praesagittifera , leaving into the family only the genera with sagittocysts. [2] Characteristics Sagittiferidae are small flat worm-like animals. Several of them grow symbiotic algae Tetraselmis in their body cavity and t