Araneus eburnus  Hi Volker, yes, my first thought was Novakiella, then no spine, so I thought A. arenaceus but not peaked enough. Then I thought a peaked A. eburnus, and now that you say it yes the eburnus abdomen is much longer and barrel shaped, although some have the white figure on the front of the abdomen. I have kept this one for you, and I will keep the hi-res 4000x3000px photos for you too.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/21021373@N04">Robert Whyte</a> from Brisbane, Australia
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/21021373@N04/4184207788/">Araneidae &gt; Araneus eburnus</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Berichard" title="User:Berichard">berichard</a></li></ul>