. Bonner zoologische Monographien. Zoology. 44 r Chordata I Notochordata Tunicata Craniata Cephalochordata. : Assumed phylogenetic systematics of the Chordata. Discussion see text. The phylogenetic hypothesis which resuks from this evidence is used as a frame- work to discuss the evolution of ontogenetic characters. The corresponding cla- dogram is depicted in The fossil record Following Hennig (1950), fossils are the only source of evidence regarding the absolute age of any monophyletic taxon. Whenever a fossil is attributable to a monophyletic taxon, the age of this taxon and i
. Bonner zoologische Monographien. Zoology. 44 r Chordata I Notochordata Tunicata Craniata Cephalochordata. : Assumed phylogenetic systematics of the Chordata. Discussion see text. The phylogenetic hypothesis which resuks from this evidence is used as a frame- work to discuss the evolution of ontogenetic characters. The corresponding cla- dogram is depicted in The fossil record Following Hennig (1950), fossils are the only source of evidence regarding the absolute age of any monophyletic taxon. Whenever a fossil is attributable to a monophyletic taxon, the age of this taxon and its sister-taxon is at least as old as the fossil in question. If the phylogenetic interpretation presented above is used as a framework to assign fossils to a monophyletic taxon, several fossils become cru- cial. Pikaia gracilens from the Middle Cambrian Burgess Shale is often considered to be a cephalochordate (Conway Morris & Whittington 1979, Conway Morris et Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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