Species of plated dinosaur Stegosaurus (Morrison Formation, Late Jurassic) of western USA: new type species designation needed

2010 ◽  
Vol 103 (2) ◽  
pp. 187-198 ◽  
Author(s):  
Peter M. Galton
Keyword(s):  
Type Species ◽  
Late Jurassic ◽  
Morrison Formation ◽  
Western Usa ◽  
New Type

On the genus Urytalpa Edwards (Diptera: Keroplatidae) in the Nordic and Nearctic regions, with fixation of a new type species and a key to world males

Zootaxa ◽  
2009 ◽  
Vol 2160 (1) ◽  
pp. 29-50 ◽  
Author(s):  
JOSTEIN KJÆRANDSEN ◽  
SVANTE MARTINSSON ◽  
KJELL HEDMARK ◽  
NEAL L. EVENHUIS
Keyword(s):  
Central Europe ◽  
Type Species ◽  
Northern Sweden ◽  
Western Usa ◽  
New Type ◽  
Species Assignment ◽  
Original Type

The five Nordic species of the genus Urytalpa Edwards (Diptera: Keroplatidae) are revised, of which one species, Urytalpa galdes Hedmark & Kjaerandsen, sp. n., is described as new to science based on males collected in northern Sweden. We find that the original type species assignment for Urytalpa (Platyura ochracea Meigen, 1818) is based on a misidentification, and in order to stabilize the nomenclature we therefore select a new type species, Urytalpa dorsalis (Staeger, 1840), sp. restit. A lectotype is designated for Orfelia ochracea (Meigen, 1818), comb. n. = Orfelia unicolor (Staeger, 1840), syn. n. The males of U. atriceps (Edwards, 1913), U. dorsalis, U. macrocera (Edwards, 1913) and U. trivittata (Lundström, 1914), and the females of U. dorsalis, U. macrocera and U. trivittata are described and illustrated based on Nordic material. As the first known Nearctic representative of Urytalpa, U. nigrita (Johannsen, 1910), comb. n., known from western USA (Washington) and Canada, is transferred from Pyrtaula to Urytalpa, illustrated and compared with the closely related U. rhapsodica Chandler, 1995 from central Europe. A key to all known males is provided. The generic limits of Urytalpa as presently understood are vague in relation to related genera and the genus is in need of a revision.

scholarly journals The rarity of gastroliths in sauropod dinosaurs – a case study in the Late Jurassic Morrison Formation, western USA

Fossil Record ◽  
2014 ◽  
Vol 18 (1) ◽  
pp. 1-16 ◽  
Author(s):  
O. Wings
Keyword(s):  
Late Jurassic ◽  
Convincing Evidence ◽  
Morrison Formation ◽  
Gastric Mill ◽  
Fossil Bone ◽  
Western Usa ◽  
Fine Grained ◽  
National Monument ◽  
Dinosaur National Monument

Abstract. Occurrences of suspected sauropod geo-gastroliths and "exoliths" (exotic clasts) are compared with authentic finds of stomach stones in the sauropods Diplodocus, Cedarosaurus, and Camarasaurus. Sedimentological and taphonomical evidence from classic sauropod dinosaur localities in the Late Jurassic Morrison Formation (Cleveland-Lloyd Dinosaur Quarry, Dry Mesa Dinosaur Quarry, Carnegie Quarry/Dinosaur National Monument, Howe Quarry, Como Bluff, and Bone Cabin Quarry) reveals very few sauropod finds with unambiguous gastroliths. The scarcity of clasts in the fine-grained sediments of most of the localities suggests that only a small number of sauropods possessed gastroliths. The occurrence of a hypothetical avian-style gastric mill in sauropods is not supported by taphonomical evidence. Exoliths that are abundant in the Early Cretaceous of the western USA are nearly absent in Late Jurassic sediments. Without an association with fossil bone, there is no convincing evidence that such clasts represent former gastroliths. It is more plausible that most exoliths have been transported in hyperclastic flows or that surface-collected stones are weathering relicts of former conglomerate layers.

DISPERSED PALYNOMORPH AND CUTICLE ASSEMBLAGES FROM THE LATE JURASSIC MORRISON FORMATION, SOUTHEASTERN UTAH: FLORISTIC AND PALEOCLIMATE IMPLICATIONS

2018 ◽  
Author(s):  
Nina L. Baghai-Riding ◽  
◽  
James I. Kirkland ◽  
Kelli C. Trujillo ◽  
Kevin R. Chamberlain ◽  
...  
Keyword(s):  
Late Jurassic ◽  
Morrison Formation

CONTEXTUALIZING A NEW, LARGE ALLOSAURUS SKELETON FROM WYOMING INTO STRATIGRAPHIC PERSPECTIVE WITHIN THE LATE JURASSIC MORRISON FORMATION

2020 ◽  
Author(s):  
Joseph Grove ◽  
◽  
Adam L. Dallmann ◽  
Kristyn Voegele ◽  
Paul Victor Ullmann ◽  
...  
Keyword(s):  
Late Jurassic ◽  
Morrison Formation

scholarly journals Isolated pliosaurid teeth from the Albian–Cenomanian (Cretaceous) of Annopol, Poland

2017 ◽  
Vol 67 (3) ◽  
pp. 393-403 ◽  
Author(s):  
Daniel Madzia ◽  
Marcin Machalski
Keyword(s):  
Cross Section ◽  
Late Cretaceous ◽  
Type Species ◽  
Late Jurassic ◽  
Morphological Variability ◽  
Original Material ◽  
Tooth Crown ◽  
Similar Morphology ◽  
Faunal Turnover ◽  
Early Late

AbstractBrachauchenine pliosaurids were a cosmopolitan clade of macropredatory plesiosaurs that are considered to represent the only pliosaurid lineage that survived the faunal turnover of marine amniotes during the Jurassic- Cretaceous transition. However, the European record of the Early to early Late Cretaceous brachauchenines is largely limited to isolated tooth crowns, most of which have been attributed to the classic Cretaceous taxon Polyptychodon. Nevertheless, the original material of P. interruptus, the type species of Polyptychodon, was recently reappraised and found undiagnostic. Here, we describe a collection of twelve pliosaurid teeth from the upper Albian-middle Cenomanian interval of the condensed, phosphorite-bearing Cretaceous succession at Annopol, Poland. Eleven of the studied tooth crowns, from the Albian and Cenomanian strata, fall within the range of the morphological variability observed in the original material of P. interruptus from the Cretaceous of England. One tooth crown from the middle Cenomanian is characterized by a gently subtrihedral cross-section. Similar morphology has so far been described only for pliosaurid teeth from the Late Jurassic and Early Cretaceous. Even though it remains impossible to precisely settle the taxonomic distinctions, the studied material is considered to be taxonomically heterogeneous.

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