https://www.cambridge.org/core/journals/journal-of-paleontology/article/abs/morphometrics-growth-characteristics-and-phylogenetic-implications-of-halysites-catenularius-tabulata-silurian-estonia/01A57CAE49824AADB5A7BF7E415B67BD
Morphometrics, growth characteristics, and phylogenetic implications of Halysites catenularius (Tabulata, Silurian, Estonia) - Volume 93 Issue 2
morphometricsgrowthcharacteristicsphylogeneticimplications