| Modern classifications of the tetrapods rely on the structure of the skull. |
| The researcher records a score for the number of errors and notes the classifications and type of each. |
| It would mean changing its existing two-tier share classifications into a single share category. |
| In traditional classifications, the hagfish, lampreys, and extinct armored jawless fish are grouped together in the paraphyletic Class Agnatha. |
| They argued that previous classifications failed to examine real lineages and tended to be based more on evolutionary grades. |
| The proposed new categories have parallels with the classifications which are already used for unit trusts. |
