Description of the lower jaws of Baculites from the Upper Cretaceous U.S. Western Interior

• Autorzy: Larson N. L. , Landman N. H.

Identyfikatory

DOI

10.1515/agp-2017-0006

• Języki publikacji: EN

Abstrakty

EN

We report the discovery of lower jaws of Baculites (Ammonoidea) from the Upper Cretaceous U.S. Western Interior. In the lower Campanian Smoky Hill Chalk Member of the Niobrara Chalk of Kansas, most of the jaws occur as isolated elements. Based on their age, they probably belong to Baculites sp. (smooth). They conform to the description of rugaptychus, and are ornamented with coarse rugae on their ventral side. One specimen is preserved inside a small fecal pellet that was probably produced by a fish. Another specimen occurs inside in a crushed body chamber near the aperture and is probably in situ. Three small structures are present immediately behind the jaw and may represent the remains of the gills. In the lower Maastrichtian Pierre Shale of Wyoming, two specimens of Baculites grandis contain lower jaws inside their body chambers, and are probably in situ. In both specimens, the jaws are oriented at an acute angle to the long axis of the shell, with their anterior ends pointing toward the dorsum. One of the jaws is folded into a U-shape, which probably approximates the shape of the jaw during life. Based on the measurements of the jaws and the shape of the shell, the jaws could not have touched the sides of the shell even if they were splayed out, implying that they could not have effectively served as opercula. Instead, in combination with the upper jaws and radula, they constituted the buccal apparatus that collected and conveyed food to the esophagus.

Słowa kluczowe

EN

jaws; Upper Cretaceous; Pierre Shale; Niobrara Chalk; Baculites

PL

szczęki; kreda górna; Pierre Shale; formacja Niobrara; Baculites

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 2017
• Tom: Vol. 67, no. 1
• Strony: 109--120
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Larson N. L.

• Larson Paleontology Unlimited, 12799 Wolframite Rd., Keystone, South Dakota 57751, USA.

autor

Landman N. H.

• Division of Paleontology (Invertebrates), American Museum of Natural History, 79th St. and Central Park West, New York 10024, USA

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).