- gnathostome
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Current conceptions of gnathostome phylogeny depict a rather simplistic arrangement of nominally monophyletic and, apparently, morphologically disparate groups.
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gnathostome
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gnathostome — ● gnathostome nom masculin Nom de sous embranchement parfois donné aux vertébrés possédant des mâchoires, par opposition aux agnathes, sans mâchoires, beaucoup moins nombreux … Encyclopédie Universelle
Gnathostome — Gnathostomata (Vertebrata) Pour les articles homonymes, voir Gnathostomata … Wikipédia en Français
gnathostome — gnatho·stome … English syllables
gnathostome — noun a vertebrate animal possessing true jaws • Hypernyms: ↑vertebrate, ↑craniate • Member Holonyms: ↑Gnathostomata, ↑superclass Gnathostomata … Useful english dictionary
Paraphyly — A cladogram showing a hypothetical descent from an ancestor species of the clade vertebrata.[1] Note that cladograms do not necessarily correspond to taxonomic classifications. In this one, Sauropsida are a paraphyletic group. It can be made… … Wikipedia
Myelin — Structure of a typical neuron Myelin sheath Dendrite … Wikipedia
Ordovician — Period 488.3–443.7 million years ago … Wikipedia
Trilobite — ] Highly complex compound eyes are another obvious feature of the cephalon (see below). Figure 3 shows gross morphology of the cephalon. The cheeks (genae) are the pleural lobes on each side of the axial feature, the glabella. When trilobites… … Wikipedia
Lungfish — For the band, see Lungfish (band). Lungfishes Temporal range: Early Devonian–Recent … Wikipedia
Placodermi — Taxobox name = Placodermi fossil range = fossil range|430|360Early/Mid Silurian – Late Devonian image width = 200px image caption = Dunkleosteus attacking Gorgonichthys regnum = Animalia phylum = Chordata subphylum = Vertebrata infraphylum =… … Wikipedia
