|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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. Monaco et al. 2014||Irregularly cylindrical permineralized structure, elongated or branched (Fig- ure 3.3), with apex showing convergent striae and strong tapering towards the tip. Dimensions varying from 20 to 40 cm (exceptionally up to 60 cm) in width, from 18 to 35 cm in length. Smooth or slightly rough outer surface (Figure 3.1, 3.2, 3.7) showing compressional structures and irregular striae, with interposed oval to subspherical and/or compressed bulges (up to 7 cm wide and 9 cm long), emerging abruptly from the surface. Concentric helicoidally envelopment in cross section, converging towards a poorly cemented nucleus (Figure 3.4, 3.6), with colour changes and locally exhibiting thin concentric bands.|