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aptychi

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Journal Article
Published: 18 October 2019
Journal of the Geological Society (2020) 177 (1): 82–102.
...R. Hoffmann; K. Stevens; H. Keupp; S. Simonsen; G. Schweigert Abstract Fossil oral ejecta that exclusively contain bivalved calcitic lower jaws of ammonites (=aptychi) from Late Jurassic Solnhofen-type deposits of southern Germany are described. Based on the symphysis length of aptychi the ammonite...
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Journal Article
Published: 01 November 2012
Proceedings of the Yorkshire Geological Society (2012) 59 (2): 99–107.
...Dean R. Lomax; Benjamin G. Hyde Summary Ammonite aptychi from the Lower Jurassic of Port Mulgrave near Whitby, U.K., are reported for the first time in association with ammonites of the Family Hildoceratidae, Subfamily Harpoceratinae. The aptychi are preserved in shale, varying...
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Journal Article
Published: 01 January 1983
Journal of Paleontology (1983) 57 (1_Part_I): 124–127.
...Ellis L. Yochelson Abstract The Chattanooga Shale in northern Alabama has yielded part of a cephalopod aptychus. This is the first report of a Devonian aptychus in the United States and only the fourth report of aptychi in the Paleozoic of North America.--Journal abstract. GeoRef, Copyright 2004...
Journal Article
Published: 01 January 1982
Journal of Paleontology (1982) 56 (1_Part_1): 215–220.
Journal Article
Published: 01 September 1980
Journal of Paleontology (1980) 54 (5): 903–909.
Journal Article
Published: 01 September 1964
Journal of Paleontology (1964) 38 (5): 899–903.