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 | | However, lampreys share with jawed vertebrates, or Gnathostomata, a large number of morphological and physiological characteristics that occur neither in hagfishes, nor in non-craniate chordates (cephalochordates and tunicates). |
 | | Heterostraci) were thought to be the sister-group of the Cephalaspidomorphi and Gnathostomata, or of the Gnathostomata alone. |
 | | In the Gnathostomata, however, testes are linked with the kidneys and sperm pass through the excretory ducts. |
| ag.arizona.edu /ENTO/tree/eukaryotes/animals/chordata/!!Craniata.nex (2627 words) |
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