|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Cephalopoda - Oncocerida - Trimeroceratidae
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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.
|C. H. Holland and P. Copper 2008||Internal mould of body chamber somewhat compressed obliquely distorting the cross-section of the base; maximum diameter 3.9 cm, minimum 3.2 cm, maximum length ca. 4.5 cm. The ventral lobe of the aperture curves narrowly to within 2.5 cm of the base of the body chamber; the positions of the two broad dorsolateral lobes are displaced; breadth of the aperture estimated at ca. 24 mm. The position of the 5 mm diameter siphuncle is close to the ventral margin of the base of the body chamber.|