Alternative spelling: Hyolithelminthes
Parent taxon: Animalia according to R. Wrona 2004
See also Kiessling 2009 and Sepkoski 2002
Sister taxa: Bilateria, Diploblastica, Homoblastica, Vertebrosa, Westgardia, Petalonamae, Chenmengella, Broccoliforma, Rhizostomites, Megathrix, Agmata, Oligoopilionus, Erniettomorpha, Chondroplon, Khasaktidae, Somatohelix, Palaeacmaea, Dictyorhabdus, Persimedusites, Tentaculitoidea, Lidaconus, Yunnanomedusa, Cnidaria, Problematica, Subtilicyathus, Silicea, Eumetazoa, Lazaichnus, Silicispongea, Bilaterialomorpha, Kimberellomorpha, Porifera, Kuckaraukia, Spygoria, Pentaradialomorpha, Triradialomorpha, Epitheliozoa, Ventogyrus, Nectocarididae, Arboreomorpha, Helanoichnus, Parazoa, Scenellopsis, Convolutubus, Yelovichnus, Atalotaenia, Evmiaksia, Kinzeriidae, Sentularia, Gephyrea, Limacites, Macrocypris kayi, Goettingenia, Xidazoon, Trichoplax, Bomakellia, Siphonoconcha, Protolyellia, Tetraradialomorpha, Hadrynichorde, Odontogriphidae, Mesozoa, Deuteronectanebos, Muricassis, Proarticulata, Euradiculata, Lomosovis, Yangtziramulus, Hadryniscala, Gaojiashania, Bronicella, Eodiorygma
Subtaxa: Beklemishevites Byronia Hyolithellidae Ivanovites Koksuja Phosphannulus Thorslundella Torellellidae Torellelloides
Ecology: stationary epifaunal suspension feeder
Distribution:
• Carboniferous of United States (2: Indiana collections)
• Arenig of the Russian Federation (1)
• Ordovician of Argentina (2), Canada (6: British Columbia, Nunavut), Estonia (4), Kazakhstan (1), the Russian Federation (3), Sweden (2)
• Cambrian of Antarctica (1), Australia (38), Canada (39: Brithish Columbia, British Columbia, Labrador, New Brunswick, Newfoundland and Labrador, Northwest Territories, Nova Scotia, Quebec), China (67), Estonia (5), France (5), Greenland (41), India (1), Iran (2), Italy (1), Jordan (1), Kazakhstan (24), Kyrgyzstan (6), Mexico (5), Mongolia (6), Morocco (3), Norway (2), Poland (1), the Russian Federation (59), South Korea (4), Spain (5), Svalbard and Jan Mayen (1), Sweden (14), Türkiye (1), the United Kingdom (9), United States (33: Massachusetts, Nevada, New York, Pennsylvania, Utah, Virginia, Washington)
• Amgan of Kyrgyzstan (1), the Russian Federation (1)
• Waucoban of United States (1: Washington)
• Caerfai of United States (1: New York)
• Placentian of Canada (2: Nova Scotia), United States (8: Massachusetts)
Total: 409 collections including 624 occurrences