 Multiple authors have suggested that the Sorraia might be a descendant of the Tarpan based on shared morphological features , principally the typical color of its coat . Other authors simply state that the Sorraia has " evident primitive characteristics " , although they do not refer to a specific ancestor . However , there have been no genetic studies comparing the Sorraia with the Tarpan , and similarity of external morphology is an unreliable measure of relatedness . 
 Multiple authors <a href='been_done' title='1'><mark>have</mark></a> suggested that the Sorraia might be a descendant of the Tarpan based on shared morphological features , principally the typical color of its coat . Other authors simply state that the Sorraia <a href='got' title='2'><mark>has</mark></a> " evident primitive characteristics " , although they do not refer to a specific ancestor . However , <a href='dey_it' title='3'><mark>there</mark></a> have been no genetic studies comparing the Sorraia with the Tarpan , and similarity of external morphology <a href='drop_aux' title='4'><mark>is</mark></a>an unreliable measure of relatedness . 
Multiple authors done suggested that the Sorraia might b a descendant of the Tarpan based on shared morphological features , principally the typical color of its coat . Other authors simply state dat da Sorraia got " evident primitive characteristics " , although they do not refer to a specific ancestor . However , it have been no genetic studies comparing the Sorraia with tdaTarpan , and similarity of external morphology an unreliable measure of relatedness .