![]() ![]() Ichthys = fish) which includes sharks and rays. Class Chondrichthyes ( chondro = cartilage.Prey on fish, and have larval forms which are different from the ![]() Class Agnatha ( a- = not, without gnatho =.The Classes in Subphylum Vertebrata include: separate males and females with sexual reproduction in most, with.a closed circulatory system with a ventral heart.an endoskeleton which will grow along with the animal.vertebrae, the skeletal units surrounding the nerve cord.Precocious attainment of sexual maturity in a larva. Root as in pediatrician genesis = origin, birth), defined as the Which is referred to as paedogenesis ( paedo = child - same The larval stage, that is, they are sexually mature prior to metamorphosis, Larval form similar to tunicate larvae that were capable of reproduction in Another theory suggests that vertebrates may have come from a Subphylum Vertebrata may have come from an Amphioxus-likeĪncestor, however vertebrates have a definite head and Amphioxusĭoesn’t.Many of these organs, and what they do still have have become highly-modified. Their larvae show typical chordate characteristics, but the adults have lost Subphylum Urochordata ( uro = tail) are called the tunicates.They are about one inch long, and live in the muddy ocean floor. Like the generic chordate described above. Gill, fish stoma = mouth) which was formerly know as genusĪmphioxus ( amphi = on both sides, double) Lancets look a lot These are in genus Branchiostoma ( branchio = Have a “head.” This subphylum includes lancelets (or lancets), so-named for Subphylum Cephalochordata ( cephalo = head), which doesn’t. ![]() The main taxa within Phylum Chordata include: In humans, the tail is present duringĮmbryonic development, but is subsequently resorbed. To the anus) is present and extends behind the anus in many taxa, thus theĪnus isn’t at posterior tip of body.
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