1) Animal order 2) Order anaspida 
Anaspida (`without shield`) is an extinct group of primitive jawless vertebrates that lived during the Silurian and Devonian periods. They are classically regarded as the ancestors of lampreys. Anaspids were small marine agnathans that lacked heavy bony shield and paired fins, but have a striking highly hypocercal tail. They first appeared in th.....
(from the article `fish`) ...eyes dorsal, close together; no common gill opening; bottom-dwelling with heterocercal tails. Length about 8–75 cm (roughly 3 to 30 in.).†Order ... ...possessing a powerful swimming tail, appear to have been bottom-dwellers. The size and shape of the mouth suggest that they were filter feeders. ......
[n] - extinct order of jawless vertebrates
order Anaspida noun extinct order of jawless vertebrates