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Juvenile morphology: A clue to the origins of the most mysterious of mysticetes?
MedLine Citation:
PMID:  23358804     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The origin of the pygmy right whale (Caperea marginata) has long been one of the most vexing conundrums of marine mammal evolution. The extremely disparate skeletal structure of Caperea and a patchy fossil record have left morphology and molecules at odds: whereas most morphological analyses ally Caperea with right whales (Balaenidae), most molecular studies instead suggest a close relationship with rorquals (Balaenopteridae) and grey whales (Eschrichtiidae). The morphological evidence supporting a Caperea-balaenid clade consists of several shared features of the skull and mandible, as traditionally observed in adult individuals. Here, we show that at least two of these features, the ascending process of the maxilla and the coronoid process, arise from substantially different precursors early during ontogeny and therefore likely do not represent genuine synapomorphies. Both of these juvenile morphologies have adult counterparts in the fossil record, thus indicating that the ontogenetic variation in the living species may be a genuine reflection of differing ancestral states. This new evidence contradicts previous morphological hypotheses on the origins of Caperea and may help to reconcile morphological and molecular evidence.
Authors:
Felix G Marx; Mónica R Buono; R Ewan Fordyce; R W Boessenecker
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-29
Journal Detail:
Title:  Die Naturwissenschaften     Volume:  -     ISSN:  1432-1904     ISO Abbreviation:  Naturwissenschaften     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0400767     Medline TA:  Naturwissenschaften     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Geology, University of Otago, P.O. Box 56, 360 Leith Walk, Dunedin, 9054, New Zealand, felix.marx@otago.ac.nz.
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