Saturday, April 30, 2005

Description of Tyrannotitan chubutensis

Two partially disarticulated skeletons found 1 km apart from each other (Rich et al. 2000)

Theropoda Marsh, 1881

-Allosauroidea Currie and Zhao, 1993
-Carcharodontosauridae Stromer, 1934
-Tyrannotitan chubutensis gen sp. nov.

Etymology: The generic name is derived from the Lation words tyrannus (tyrant) and titan (giant), the specific name from the Chubut province, Argentina.

Holotype: MPEF-PV 1156 (Museo Paleontologico "Egidio Feruglio"): Partial dentaries, isolated teeth, dorsals 3-8 and 11-14, proximal caudal vertebra, isolated ribs and haemals arches, incomplete left scapulocoracoid and right humerus and ulna; pubes, ischia, and fragments of left ilium; almost complete left femora, fibula and metatarsal II.

Paratype: MPEF-PV 1157: jugals, right dentary, isolated teeth, atlas, cervical 9?, dorsals 7?, 10 and 13, partially preserved fused centra of sacrals 1-5, isolated distal caudals, ribs, right femur, incomplete left metatarsal II, pedal phalanges 2.I, 2.II, and 3.III. Paratype specimen is approximately 7% larger than that of the holotype.

Locality and horizon: "La Juanita" farm, 28 km NE of Paso de Indios, Chubut Province, Argentina. Possibly Cerro Castano Member, Cerro Barcino Formation, Aptian (Musacchio and Chebli 1975; Codignotto et al. 1978; Rich et al. 200)

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All information and photo(s) was gathered from the following paper posted earlier in the day.

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