|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Hyolithelminthida - Hyolithellidae
It was assigned to Hyolithelminthes by Sepkoski (2002); and to Hyolithellidae by Fisher (1962), Rozanov et al. (1969), Skovsted (2006), Landing et al. (2008) and Parkhaev and Demidenko (2010).
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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.
|P. Y. Parkhaev and Y. Demidenko 2010||"Narrow conical straight or curved tubes opened from both ends, with expansion angle up to 5°. Cross-section of tubes circular. Tubes externally smooth, or bear transversal or rarely longitudinal ornamentation. Internal surface smooth. Tube wall bilaminar."|