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GERALD MAYR* Forschungsinstitut Senckenberg, Division of Ornithology, Senckenberganlage 25, D-60325 ... - page 10 / 10





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is also performed by many small passeriform birds with short, broad wings (e.g. Oehme 1959).

If monophyly of Trochilidae and Jungornithidae can be confirmed by future fossil specimens, the Jungornithidae sensu Karhu (1999) would probably be paraphyletic, with Jungornis being more closely related to the Trochilidae than Argornis and Parar- gornis, which lack the above mentioned derived features of the humerus. This would also coincide with the temporal occurrence of the taxa, as the derived trochilid characters are present in the geologically youngest taxon, Jungornis.

Finally, it should be noted that, although the humerus of the putative hemiprocnid Cypselavus is similar to that of recent Hemiprocnidae, it also resembles the corresponding bone of the contempo- raneous genus Argornis with which it has not been compared so far. As in Argornis, and contrary to Hemiprocne, Cypselavus exhibits a large, tapering crista deltopectoralis. Furthermore, the morphology of the coracoid that was assigned to C. gallicus by Mourer-Chauviré (1978) concords with Jungornis, Argornis and Parargornis. As mentioned in the intro- duction, this bone was described as a new taxon of the Jungornithidae by Karhu (1988). Direct exami- nation of the specimens will have to show whether Cypselavus gallicus is more closely related to Argornis than to recent Hemiprocnidae, and whether Palescy- vus escampensis is a junior synonym of this species.

I thank N. Micklich (HLMD) for the loan of the fossil specimen, and S. Tränkner (Forschungsinstitut Sencken- berg) for taking the photographs.


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Received 10 April 2001; revision accepted 2 May 2002

© 2003 British Ornithologists’ Union, Ibis, 145, 382–391

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