Apparent absence of claustrum in monotremes: implications for forebrain evolution in amniotes.
The claustrum, which comprises the claustrum proper and the endopiriform nucleus, is generally thought to be present in all mammals. Some previous reports of its possible absence in monotremes have appeared in the literature, but the question of its presence or absence in this clade has not been formally addressed. Whether monotremes have a claustrum is of some importance for formulating and evaluating hypotheses relating to the evolution of the structures in the lateral sector of the pallium...Expand abstract
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