Anaspida are an extinct marine subgroup of the agnatha. They lived from the Early Silurian to the Late Devonian times. Anaspida are similar to the Osteostraci and had unpaired fins. Groups Myxini(hagfish) Hyperoartia Petromyzontidae(lampreys) Pteraspidomorphi Thelodonti Anaspida Cephalaspidomorphi Galeaspida Pituriaspida Osteostraci Agnatha (Greek, no jaws) is a Ġ ġ İ ı Ż ż paraphyletic superclass of jawless fish in the phylum Chordata, subphylum Vertebrata. ...