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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.
|V. J. Okulitch 1950||cups of cylindrical or conical shape, the outer wall transversely annulated by deep horizontal bulges. Parieties in part well defined and radial, in part wavy, passing into trabecular tissue within the bulges. All parieties more or less synapticulate. Dissepiments are present in some of the species. Inner wall simple, perforated by the usual pores or larger canals.|