Tintinnids are ciliates of the choreotrich taxon Tintinnida, distinguished by vase-shaped shells called loricae, which are mostly protein but may incorporate minute pieces of minerals (Agatha, Laval-Peuto & Simon 2013). Fossils resembling tintinnid loricas in shape and size, Calpionellids, appear as early as the Ordovician period but are formed of...
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http://en.wikipedia.org/wiki/Tintinnid
any protozoan of the ciliate order Tintinnida, characteristically conical or trumpet-shaped. Although most are marine, some forms are found in fresh ... [2 related articles]
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http://www.britannica.com/eb/a-z/t/53
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