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Clypeaster annandalei caviventer Deraniyagala, 1961; Holotype (Colombo Museum No. F 60.5.32), Miocene, Minihagal Kanda, Sri Lanka. Aboral and oral view. Length of test 41 mm. Note that while the plate description suggest that both images illustrate the same specimen, namely the holotype, this clearly is not the case. from Deraniyagala, P. E. P. 1961. The Amphitheatres of Minihagel Kanada, Their Possible Origin and Some of the Fossils and Stone Artefacts Collected from Them. Spolia Zeylanica, Bulletin of the National Museums of Ceylon 29, 149-161.
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Fossil sand dollar, Miocene of Peace River, Hardee County, Florida, USA Image kindly provided by Fred Mazza, Paleo Discoveries http://www.paleodiscoveries.com/Invertebrates.html
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Aboral and oral surface of Sculpsitechinus tenuissimus, California Academy of Sciences (CASIZ 112664), Kakeroma Island, Ryukyu Islands, Japan.
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Aboral and oral view of a naked Echinodiscus truncatus), from Bali, Indonesia (Museum of Toulouse, France). Width : 7 cm. Author : Didier Descouens (https://commons.wikimedia.org/wiki/User:Archaeodontosaurus). (probably misidentified as Sculpsitechinus tenuissimus)
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Lanthonia longifissa (previously known as Mellita longifissa) from Punta Chame, Panama, eastern Pacific. ID & Photographer : Simon E. Coppard (http://echinoderms.lifedesks.org/gallery?page=10).
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Lanthonia longifissa, aboral view of denuded test. Punta Chame, Panama, eastern Pacific. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/185).
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Lanthonia grantii, aboral view of denuded test. Golfo de San Miguel, Darien, Panama, eastern Pacific. Source : Echinoderms of Panama (http://echinoderms.lifedesks.org/file-colorboxed/367).
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