|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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|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."|