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Perusal of a reprint kindly supplied by Wang and Zhou suggests that
Chaoyangopterus is indeed an azhdarchoid. In any case it is almost
certainly not related to Nyctosaurus, which exhibits numerous apomophies
of Ornithocheiroidea while Chaoyangopterus does not. Chaoyangopterus
lacks at least one key azhdarchid apomophy (highly elongate mid-series
cervicals) and seems to compare quite well (at least morphometrically
speaking) with Sinopterus which has been identified as a tapejarid,
generally recognised (at least by me and Kellner) as a basal azhdarchoid.
Further details should appear in various papers in the Geol. Soc.
Evolution and Palaeobiology of Pterosaurs volume due out in September
(more shameless touting, I know).
PS, Ollie, did you remember to feed HH, seeing as you were the last one
to take him out for a ride?
David M. Unwin PhD
Institut fur Palaontologie, MUSEUM FUR NATURKUNDE
Zentralinstitut der Humboldt-Universitat zu Berlin
Invalidenstrasse 43, D-10115 Berlin, GERMANY
0049 30 2093 8577 (office)
0049 30 2093 8862 (department secretary)
0049 30 2093 8868 (fax)