holocephali การใช้

• Eastman 1903 gave Cochliodontidae as the parent taxon while Sepkoski 2002 suggested Holocephali.
• Edestids, along with the rest of Eugeneodontida, are placed within Holocephali.
• The subclass Holocephali, which is a very specialized group, lacks both the Leydig's and epigonal organs.
• With their big heads, big eyes, and long bodies, the ptyctodontids bore a superficial resemblance to modern day chimaeras ( Holocephali ).
• Chondrichthyes is a monophyletic group divisible into two sister taxa, the Elasmobranchii and Holocephali, and the extant chondrichthyans are derivable from Mesozoic forms.
• A Bayesian analysis of molecular data suggests that the Holocephali and Elasmoblanchii diverged in the Silurian ( ) and that the sharks and rays / skates split in the Carboniferous ( ).
• More recently, Symmoriida as a whole has been reclassified as part of Holocephali, meaning that " Stehacnathus " is more closely related to modern chimeras than to sharks.