Embryonic Skulls of Titanosaur Sauropod Dinosaurs-Reference-Cited by-同舟云学术

Embryonic Skulls of Titanosaur Sauropod Dinosaurs

Published:2001-09-28 Issue:5539 Volume:293 Page:2444-2446
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Chiappe Luis M.¹,Salgado Leonardo²,Coria Rodolfo A.³

Affiliation:

1. Department of Vertebrate Paleontology, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA.

2. Museo de Geologı́a y Paleontologı́a, Universidad Nacional del Comahue, Buenos Aires 1400, (8300) Neuquén, Provincia del Neuquén, Argentina.

3. Museo Carmen Funes, (8318) Plaza Huincul, Provincia del Neuquén, Argentina.

Abstract

Little is known about the cranial anatomy of the taxonomically diverse and geographically widespread titanosaurs, a paucity that has hindered inferences about the genealogical history and evolutionary development of the latest sauropod dinosaurs. Newly discovered fossil eggs containing embryonic remains from the Late Cretaceous of Argentina provide the first articulated skulls of titanosaur dinosaurs. The nearly complete fetal skulls shed light on the evolution of some of the most notable cranial features of sauropod dinosaurs, including the retraction of the external nares, the forward rotation of the braincase, and the abbreviation of the infraorbital region.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference23 articles.

1. Sauropod dinosaur embryos from the Late Cretaceous of Patagonia

2. Hundreds of egg clutches have been discovered at Auca Mahuevo (19 20). A large number of eggs from this site contain bone remains and/or calcite-replaced patches of integument (1 19 20). Magnetostratigraphic characterization of the Rı́o Colorado Formation at Auca Mahuevo supports an early or middle Campanian age (∼83.5 to 79.5 million years ago) for this lithostratigraphic unit (21).

3. All embryonic remains from Auca Mahuevo belong to the vertebrate paleontology collection (MCF-PVPH) of the Museo Municipal “Carmen Funes” in Plaza Huincul (Province of Neuquén Argentina).

4. The skull length of the best-preserved specimen (MCF-PVPH-272) is ∼35.0 mm from the proximocaudal end of the quadrate to the tip of the rostrum; the horizontal length of its orbit is 13.5 mm. The parietal width measured from its contribution to the supratemporal fenestra to the interparietal suture is about 7.6 mm and 8.3 mm in MCF-PVPH-272 and MCF-PVPH-250 respectively. The teeth of the new and previously reported embryos are ∼2.0 mm in length (1). Estimates based on limb measurements suggest that the total length of the most advanced embryos was ∼300 mm (20).

5. The last of the dinosaur titans: a new sauropod from Madagascar

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