There Is Little Question That Chordata Is a Monophyletic Group

question 15

Multiple Choice

There is little question that Chordata is a monophyletic group.There are some unresolved questions regarding whether the Craniata is more closely related to the Cephalochordata or to the Urochordata.Assume that the following new discoveries were made.Which might sway expert opinion in the direction of a sister relationship between Craniata and Cephalochordata? Check all that apply.

• A)Reinterpretations challenging molecular evidence from recent rRNA studies.
• B) Fossil discoveries suggesting a rudimentary tripartite brain in cephalochordate ancestors.
• C) Fossil discoveries of a pharyngeal apparatus with an endostyle and many stigmata in early craniate filter feeders.
• D) Reinterpretations challenging molecular evidence from recent genomic DNA studies.

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