Phylogeny of the Echini, Boston, The Society, 1912, paleontology, Paleozoic, sea urchins, fossil, fossils, sea urchins, The image features a collection of detailed illustrations showcasing various types of echinoid tests, which are the hard outer shells of sea urchins. The specimens are labeled with letters and numbers for identification, indicating different morphological features. Each test displays unique textures and patterns, highlighting the intricate designs that characterize these marine organisms. The varying shapes and surfaces provide insight into their biological structure and evolutionary adaptations. Prominently, one specimen is rendered with an emphasis on its pentaradial symmetry, common among echinoderms, while others exhibit more irregular forms, suggesting a diverse range of species or developmental stages.

Phylogeny of the Echini, Boston, The Society, 1912, paleontology, Paleozoic, sea urchins, fossil, fossils, sea urchins, The image features a collection of detailed illustrations showcasing various types of echinoid tests, which are the hard outer shells of sea urchins. The specimens are labeled with letters and numbers for identification, indicating different morphological features. Each test displays unique textures and patterns, highlighting the intricate designs that characterize these marine organisms. The varying shapes and surfaces provide insight into their biological structure and evolutionary adaptations. Prominently, one specimen is rendered with an emphasis on its pentaradial symmetry, common among echinoderms, while others exhibit more irregular forms, suggesting a diverse range of species or developmental stages.

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2882 x 3901 px | 32.2 MB

24.4 x 33.0 cm | 9.6 x 13.0 in (300 dpi)