Published April 24, 2019
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FIGURE 4 in Lower Jaw of Spathites (Ammonoidea: Acanthoceratoidea) from the Upper Cretaceous (Turonian) of New Mexico
Description
FIGURE 4. Cross section of a piece of the aptychus from the anterior edge of the left plate, with the outer (ventral) surface on top. A. The aptychus is 0.19 mm thick and consists of a very thin outer layer 7.7 µm thick and a thicker inner (dorsal) layer—the rest of the aptychus. B. Close-up of the bottom of the inner layer showing oblique laminations. C. Close-up of the middle of the inner layer showing massive microstructure. D. Close-up of the outer layer showing massive microstructure.
Notes
Published as part of Landman, Neil H., Sealey, Paul L., Foley, Michael P. & Lucas, Spencer G., 2019, American Museum Novitates 2019 (3925) on page 1, DOI: 10.1206/3925.1, http://zenodo.org/record/5369770
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- Is part of
- Journal article: 10.1206/3925.1 (DOI)
- Journal article: urn:lsid:plazi.org:pub:9817FFA6FFD28B7B4B541825D629CC19 (LSID)
- Journal article: https://zenodo.org/record/5369770 (URL)