DINOSAUR TYPE SPECIMENS A B C D E F F G H I J K L M N O P Q R S T U V W X Y Z Frequently Asked Questions Additional References Texasetes pleurohalio Thescelosaurus neglectus Thespesius annectens [see Claosaurus annectens] Thespesius occidentalis Torosaurus utahensis [see Arrhinoceratops utahensis] Trachodon annectens [see Claosaurus annectens] Trachodon tripos Trachodon tripos Triceratops alticornis Triceratops calicornis Triceratops elatus Triceratops galeus > Triceratops hatcheri Triceratops obtusus Triceratops sulcatus Tröodon wyomingensis [see Pachycephalosaurus wyomingensis] > Triceratops hatcheri - Lull 1905   Catalogue: USNM 2412 Material: partial skull Classification: Ornithischia, Marginocephalia, Ceratopsia, Ceratopsidae Collected: J. B. Hatcher Place: Lance Formation, Niobrara County, Wyoming, USA Time: Maastrichtian, Late Cretaceous Original Publication: R. S. Lull. 1905. American Journal of Science series 4, 20:413-419 Other References: Hatcher, Marsh & Lull, 1907; Lull, 1933; Ostrom & Wellnhofer, 1986; Ostrom & Wellnhofer in Carpenter & Currie, 1990; Forster, 1996 The specimen has three large holes in the frill, which is a feature unknown in Triceratops. Some paleontologists therefore consider this specimen to be pathological (showing evidence of illness or injury), and therefore a junior synonym of Triceratops horridus. Others consider it to be a valid species of a different genus, Diceratops
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