|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
It was assigned to Rhynchonellida by Sepkoski (2002); to Trigonirhynchiinae by Jin and Chatterton (1997) and Williams et al. (2002); and to Trigonirhynchiidae by Bassett and Cocks (1974), Rubel and Rozman (1977) and Musteikis and Modzalevskaya (2002).
|Year||Name and author|
|1974||Ancillotoechia Bassett and Cocks|
|1977||Ancillotoechia Rubel and Rozman|
|1997||Ancillotoechia Jin and Chatterton|
|2002||Ancillotoechia Musteikis and Modzalevskaya|
|2002||Ancillotoechia Sepkoski, Jr.|
|2002||Trigonirhynchioides Sepkoski, Jr.|
|2002||Ancillotoechia Williams et al. p. 1052|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.