|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Hyolithus (Hyolithus) mutatus
Hyolithida - Hyolithidae
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.
|J. M. Malinky and C.B. Skovsted 2004||Cyrtoconic conch with apical curvature toward dorsum; conch has narrow tapering appearance due to low apical angle; venter seemingly flat, grading into sharp lateral edges; flanks of dorsum inflated and rounded, intersecting to create rounded central ridge; ligula apparently short and rounded on anterior edge with gently dipping sides; cross−section triangular; shell on dorsum and venter with faint, closely spaced transverse lines; internal mould of dorsum with widely and irregularly spaced transverse rugae.|