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- Agnatha abstract "Agnatha (Greek, "no jaws") is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species. The group excludes all vertebrates with jaws, known as gnathostomes.The agnathans as a whole are paraphyletic, because most extinct agnathans belong to the stem group of gnathostomes. Recent molecular data, both from rRNA and from mtDNA strongly supports the hypothesis that living agnathans, the cyclostomes, are monophyletic.The oldest fossil agnathans appeared in the Cambrian, and two groups still survive today: the lampreys and the hagfish, comprising about 120 species in total. Hagfish are considered members of the subphylum Vertebrata, because they secondarily lost vertebrae; before this event was inferred from molecular and developmental data, the group Craniata was created by Linnaeus (and is still sometimes used as a strictly morphological descriptor) to reference hagfish plus vertebrates. In addition to the absence of jaws, modern agnathans are characterised by absence of paired fins; the presence of a notochord both in larvae and adults; and seven or more paired gill pouches. Lampreys have a light sensitive pineal eye (homologous to the pineal gland in mammals). All living and most extinct Agnatha do not have an identifiable stomach or any appendages. Fertilization and development are both external. There is no parental care in the Agnatha class. The Agnatha are ectothermic or cold blooded, with a cartilaginous skeleton, and the heart contains 2 chambers.While a few scientists still regard the living agnathans as only superficially similar, and argue that many of these similarities are probably shared basal characteristics of ancient vertebrates, recent classifications clearly place hagfish (the Myxini or Hyperotreti), with the lampreys (Hyperoartii) as being more closely related to each other than either is to the jawed fishes.[citation needed]".
- Agnatha thumbnail Lampetra_fluviatilis.jpg?width=300.
- Agnatha wikiPageID "189055".
- Agnatha wikiPageRevisionID "606341545".
- Agnatha excludes Gnathostomata.
- Agnatha hasPhotoCollection Agnatha.
- Agnatha imageCaption "Lampetra fluviatilis".
- Agnatha name "Agnathans".
- Agnatha phylum Chordate.
- Agnatha regnum "Animalia".
- Agnatha subphylum Vertebrate.
- Agnatha superclassis "Agnatha".
- Agnatha superclassisAuthority "Cope, 1889".
- Agnatha subject Category:Vertebrates_without_jaws.
- Agnatha type AnimalTissue105267548.
- Agnatha type BodyPart105220461.
- Agnatha type Bone105269901.
- Agnatha type ConnectiveTissue105286536.
- Agnatha type Jaw105546040.
- Agnatha type Part109385911.
- Agnatha type PhysicalEntity100001930.
- Agnatha type Thing100002452.
- Agnatha type Tissue105267345.
- Agnatha type VertebratesWithoutJaws.
- Agnatha comment "Agnatha (Greek, "no jaws") is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species. The group excludes all vertebrates with jaws, known as gnathostomes.The agnathans as a whole are paraphyletic, because most extinct agnathans belong to the stem group of gnathostomes.".
- Agnatha label "Agnatha".
- Agnatha label "Agnatha".
- Agnatha label "Agnatha".
- Agnatha label "Agnatha".
- Agnatha label "Agnatha".
- Agnatha label "Bezżuchwowce".
- Agnatha label "Kaakloze vissen".
- Agnatha label "Kieferlose".
- Agnatha label "Бесчелюстные".
- Agnatha label "لافكيات".
- Agnatha label "無頷總綱".
- Agnatha label "無顎類".
- Agnatha sameAs Kieferlose.
- Agnatha sameAs Άγναθοι.
- Agnatha sameAs Agnatha.
- Agnatha sameAs Agnatu.
- Agnatha sameAs Agnatha.
- Agnatha sameAs Agnatha.
- Agnatha sameAs Agnatha.
- Agnatha sameAs 無顎類.
- Agnatha sameAs 무악류.
- Agnatha sameAs Kaakloze_vissen.
- Agnatha sameAs Bezżuchwowce.
- Agnatha sameAs Agnatha.
- Agnatha sameAs m.019wb0.
- Agnatha sameAs Q161095.
- Agnatha sameAs Q161095.
- Agnatha sameAs Agnatha.
- Agnatha wasDerivedFrom Agnatha?oldid=606341545.
- Agnatha depiction Lampetra_fluviatilis.jpg.
- Agnatha isPrimaryTopicOf Agnatha.
