Protozoa - Nassellaria - Williriedellidae
Parent taxon: Nassellaria according to P. Zügel 1997
See also Kiessling 1995
Sister taxa: Abnormisphaera, Acanthodesmiacea, Acerahedrina, Acerocanium, Acidnomelos, Acotripus, Acropyramididae, Adelocyrtis, Afens, Amphipyndacea, Anisicyrtiidae, Anthocyrtoma, Archaeodictyomitracea, Archaeosemantidae, Archeeucyrtis, Archicorys, Archocyrtiidae, Ares, Artoperina, Artostrobium, Ayrtonius, Barbutidae, Bathrocalpis, Belleza, Botryocella, Calyptocoryphe, Canelonus, Canesium, Carterwhalenia, Cephalopyramis, Cladospyris, Clathrospyris, Collicyrtidium, Confiroma, Corocalyptra, Cortiniscus, Crubidae, Cryptocapsa, Cryptopora, Cuniculiformiidae, Cyrtocalpis, Cyrtoidea, Deflandrecyrtiidae, Dendrocircus, Diacanthocapsidae, Dictyospyris, Dipodospyris, Distylocapsa, Eucyrtidiacea, Eucyrtidiellidae, Ewingella, Farcidae, Favosyringium, Foremanellinidae, Foremania, Foremaniella, Globolaxtorum, Glycobotrys, Haliphormis, Heloringulum, Hexapylocapsidae, Hilarisiregidae, Homeoarchicorys, Hsuuidae, Japonocampe, Kassina, Krempelinella, Kuppelella, Laxuscingula, Lithobotrys, Lithocampana, Lithocarpium, Lithomitra, Lithornithium, Livarellidae, Lophoconus, Lophocorys, Lophophaenidae, Lychnodictyum, Minutusolla, Monosera, Morosyringium, Mostlericyrtium, Muellericyrtiidae, Nabolellidae, Nabollellidae, Nebespecha, Neosciadiocapsidae, Octotympanum, Perseus, Phaenocalpis, Phaenoscenium, Phormocampe, Plagiacanthidae, Plagionium, Plagoniidae, Platycryphalus, Plectopyramis, Podocoronis, Popofskyellidae, Poulpidae, Pseudosaturniformidae, Quarkus, Quasipetosus, Religa, Ruesticyrtiidae, Salpingocapsa, Sanfilippoellidae, Schadelfussdlerus, Senelella, Sethocapsidae, Sethocyrtis, Sethodiscus, Sethoperidae, Sethopilium, Siphocampium, Solidea, Sphaerospyris, Spinomersinellidae, Spirocampe, Spongomelissa, Spyrida, Stampfliellidae, Stephaniscus, Stichocampe, Stichocapsidae, Stichophormis, Stylocryptocapsa, Syringium, Telacapsulidae, Tertoniidae, Tetrarrhabda, Tetraspinocyrtiidae, Theocapsa, Theophormis, Trexus, Triassocampidae, Triassocyrtium, Tricolocampe, Tripedurnulidae, Tripilidium, Tripocalpis, Tripocyrtis, Tripodiscium, Tripodonium, Tripodospyris, Tripophaenoscenium, Trissopilium, Ultranaporidae, Urocyrtis, Windalia, Xipha, Xiphothecaellidae
Subtaxa: Cryptamphorella Excentropylomma Helvetocapsa Hemicryptocapsa Hiscocapsa Holocryptocanium Holocryptocapsa Immersothorax Kozurium Minocapsa Praewilliriedellum Striatojaponocapsa Tricolocapsa Trisyringium Williriedellum Zhamoidellum
Type: Williriedellum
Ecology: passively mobile planktonic omnivore
Distribution:
• Cretaceous of Antarctica (1 collection), Azerbaijan (6), Canada (1: Nunavut), Costa Rica (1), the Czech Republic (1), Denmark (3), Germany (2), Greece (3), Italy (51), Japan (2), Malaysia (13), North Pacific (1), Oman (17), the Philippines (1), Poland (16), the Russian Federation (7), Slovakia (2), Trinidad and Tobago (2), Turkey (2), United States (24: California)
• Jurassic to Cretaceous of China (1), Oman (1)
• Jurassic of Albania (24), Antarctica (16), Armenia (2), Canada (12: British Columbia), China (1), Costa Rica (1), Germany (35), Greece (8), Hungary (2), Indonesia (1), Italy (28), Japan (32), New Zealand (1), Nicaragua (2), Oman (13), the Philippines (5), Romania (6), the Russian Federation (27), Slovakia (12), Slovenia (3), Spain (5), Switzerland (3), United States (34: California, Oregon)
Total: 431 collections including 1016 occurrences