Between brackets is the number of accepted extant species

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Shows the number of accepted extant species within the taxon
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- Biota (879)
- Kingdom Animalia (681)
- Phylum Annelida (119)
- Phylum Arthropoda (168)
- Phylum Bryozoa (3)
- Phylum Chaetognatha (2)
- Phylum Chordata (276)
- Phylum Cnidaria (5)
- Phylum Ctenophora (3)
- Phylum Echinodermata (7)
- Phylum Kinorhyncha (2)
- Phylum Mollusca (70)
- Phylum Nematoda (1)
- Class Chromadorea (1)
- Subclass Chromadoria (1)
- Order Rhabditida (1)
- Suborder Spirurina (1)
- Infraorder Spirurina incertae sedis (1)
- Superfamily Dracunculoidea Stiles, 1907 (1)
- Family Anguillicolidae Yamaguti, 1935 (1)
- Subfamily Anguillicolinae Yamaguti, 1935 (1)
- Genus Anguillicola Yamaguti, 1935 (1)
- Subgenus Anguillicola (Anguillicoloides) Moravec & Taraschewski, 1988 accepted as Anguillicoloides Moravec & Taraschewski, 1988
- Species Anguillicola (Anguillicoloides) crassus Kuwahara, Niimi & Itagaki, 1974 accepted as Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974
- Species Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974
- Genus Anguillicoloides Moravec & Taraschewski, 1988 accepted as Anguillicola Yamaguti, 1935
- Phylum Platyhelminthes (1)
- Phylum Porifera (2)
- Phylum Rotifera (22)
- Kingdom Bacteria (5)
- Kingdom Chromista (179)
- Kingdom Plantae (14)
- Kingdom Protozoa