Rhynchonellata - Terebratulida

Synonym: Zeilleriacea Allan 1940 [replaced name]

Parent taxon: Terebratellidina according to A. Williams et al. 2006

Sister taxa: Antigoniarcula, Bouchardioidea, Eogryphus, Gwyniella, Hercothyris, Kingenella, Kingenoidea, Kraussinoidea, Kurakithyris, Laqueoidea, Leptothyrellopsis, Lutetiarcula, Magas, Megathyridoidea, Miogryphus, Platidioidea, Praeneothyris, Rhynchora, Rhynchorina, Terebratelloidea, Tiaretithyris, Xinjiangthyris, Yabeithyris, Yuezhuella, Zhidothyris

Subtaxa: Eudesiidae, Gusarellidae, Zeilleriidae

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Ecology: stationary epifaunal suspension feeder