![The internal morphology of primary spines of extant regular echinoids in the tropical western Atlantic: a SEM atlas | Swiss Journal of Palaeontology | Full Text The internal morphology of primary spines of extant regular echinoids in the tropical western Atlantic: a SEM atlas | Swiss Journal of Palaeontology | Full Text](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs13358-018-0157-x/MediaObjects/13358_2018_157_Fig10_HTML.jpg)
The internal morphology of primary spines of extant regular echinoids in the tropical western Atlantic: a SEM atlas | Swiss Journal of Palaeontology | Full Text
![A. Coarse bioclastic grainstone with echinoderms (Ech), bryozoans (Br),... | Download Scientific Diagram A. Coarse bioclastic grainstone with echinoderms (Ech), bryozoans (Br),... | Download Scientific Diagram](https://www.researchgate.net/publication/280009212/figure/fig7/AS:550469899689989@1508253659210/A-Coarse-bioclastic-grainstone-with-echinoderms-Ech-bryozoans-Br-bivalves-Bi.png)
A. Coarse bioclastic grainstone with echinoderms (Ech), bryozoans (Br),... | Download Scientific Diagram
![Thin section photographs of limestone of the Gray Mesa Formation (A)... | Download Scientific Diagram Thin section photographs of limestone of the Gray Mesa Formation (A)... | Download Scientific Diagram](https://www.researchgate.net/publication/320832895/figure/fig5/AS:556615566278666@1509718900958/Thin-section-photographs-of-limestone-of-the-Gray-Mesa-Formation-A-and-Bar-B-Formation.png)
Thin section photographs of limestone of the Gray Mesa Formation (A)... | Download Scientific Diagram
![The internal morphology of primary spines of extant regular echinoids in the tropical western Atlantic: a SEM atlas | Swiss Journal of Palaeontology | Full Text The internal morphology of primary spines of extant regular echinoids in the tropical western Atlantic: a SEM atlas | Swiss Journal of Palaeontology | Full Text](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs13358-018-0157-x/MediaObjects/13358_2018_157_Fig13_HTML.jpg)