scholarly journals Reexamination of a primitive ornithomimosaur, Garudimimus brevipes Barsbold, 1981 (Dinosauria: Theropoda), from the Late Cretaceous of Mongolia

2005 ◽  
Vol 42 (9) ◽  
pp. 1501-1521 ◽  
Author(s):  
Yoshitsugu Kobayashi ◽  
Rinchen Barsbold
Keyword(s):  
Upper Cretaceous ◽  
Feeding Habits ◽  
Caudal Vertebra ◽  
Middle Portion ◽  
Anterior Portion ◽  
Original Diagnosis ◽  
Deep Groove ◽  
Dorsal Process ◽  
Anatomical Information ◽  
Edentulous Jaws

The holotype of Garudimimus brevipes, discovered from the Upper Cretaceous sediments of Mongolia and named by Barsbold in 1981, is redescribed in detail in this paper. Reexamination of the holotype reveals a great deal of anatomical information, which allows us to revise the original diagnosis of this taxon and make comparisons with other ornithomimosaur taxa to understand the evolution of ornithomimosaurs. This paper suggests that characters used to differentiate this taxon in the original paper (short ilia, short metatarsals, exposure of the proximal end of metatarsal III, presence of pedal digit I, and absence of pleurocoels) are not apomorphies but represent the primitive conditions in ornithomimosaurs and are symplesiomorphies. Revised diagnoses are assigned for G. brevipes (posteriorly positioned jaw articulation, fossae at base of dorsal process of supraoccipital, paired depressions on neural spines of proximal caudal vertebra, and deep groove on lateral surface of pedal phalanges III-1 and III-2). Metatarsals of Garudimimus display a non-arctometatarsalian condition as in an Early Cretaceous form, Harpymimus, but the constriction of metatarsal III in Garudimimus is intermediate between Harpymimus and the arctometatarsalian condition in Gallimimus and other derived ornithomimosaurs (ornithomimids). Garudimimus is the only non-ornithomimid ornithomimosaur with edentulous jaws, which were probably covered by rhamphothecae. The loss of teeth with evolution of rhamphothecae and development of a cutting edge in the dentary of Garudimimus suggest the acquisition of feeding habits that included plucking food at the anterior portion of the jaw and cutting at the middle portion, similar to ornithomimids.

Computed Tomogram Findings of Mucous Recirculation between the Natural and Accessory Ostia of the Maxillary Sinus

2002 ◽  
Vol 16 (5) ◽  
pp. 265-268 ◽  
Author(s):  
Seung-Kyu Chung ◽  
Do Yeon Cho ◽  
Hun Jong Dhong
Keyword(s):  
Maxillary Sinus ◽  
Ring Structure ◽  
Endoscopic Examination ◽  
Mucous Secretion ◽  
Middle Portion ◽  
Anterior Portion ◽  
Posterior Portion

Background The phenomenon of recirculation involves the circulation of mucous secretion between the natural ostium and other openings and is observed mainly after surgery when the surgical opening is not connected. Methods Seven patients with a mucous stream transporting into an accessory ostium, as found during endoscopic examination, were entered into study. The coronal computed tomogram findings of the mucous recirculation were analyzed at three levels: anterior, middle, and posterior portion of it. Results The anterior portion was visualized at the level of the natural ostium in five patients. The middle portion inside the maxillary sinus was visible in six cases. The posterior portion was visualized at the level of the accessory ostium in five patients. Among the axial scans, mucous rings were visible in two patients. Conclusions The primary mucous recirculation between the natural and accessory openings is shown as a ring structure in coronal computed tomogram scans.

scholarly journals First rebbachisaurid sauropod dinosaur from Asia

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246620
Author(s):  
Alexander Averianov ◽  
Hans-Dieter Sues
Keyword(s):  
Phylogenetic Analysis ◽  
Fossil Record ◽  
Upper Cretaceous ◽  
Neural Spine ◽  
Lateral Side ◽  
New Taxon ◽  
Caudal Vertebra

Dzharatitanis kingi gen. et sp. nov. is based on an isolated anterior caudal vertebra (USNM 538127) from the Upper Cretaceous (Turonian) Bissekty Formation at Dzharakuduk, Uzbekistan. Phylogenetic analysis places the new taxon within the diplodocoid clade Rebbachisauridae. This is the first rebbachisaurid reported from Asia and one of the youngest rebbachisaurids in the known fossil record. The caudal is characterized by a slightly opisthocoelous centrum, ‘wing-like’ transverse processes with large but shallow PRCDF and POCDF, and the absence of a hyposphenal ridge and of TPRL and TPOL. The neural spine has high SPRL, SPDL, SPOL, and POSL and is pneumatized. The apex of neural spine is transversely expanded and bears triangular lateral processes. The new taxon shares with Demandasaurus and the Wessex rebbachisaurid a high SPDL on the lateral side of the neural spine, separated from SPRL and SPOL. This possibly suggests derivation of Dzharatitanis from European rebbachisaurids. This is the second sauropod group identified in the assemblage of non-avian dinosaurs from the Bissekty Formation, in addition to a previously identified indeterminate titanosaurian.

scholarly journals Crocodyliform affinities for Kemkemia auditorei Cau & Maganuco, 2009 from the Late Cretaceous of Morocco

2012 ◽  
Vol 153 (1) ◽  
pp. 119 ◽  
Author(s):  
Gabriel Lio ◽  
Federico Agnolin ◽  
Andrea Cau ◽  
Simone Maganuco
Keyword(s):  
Upper Cretaceous ◽  
New Genus ◽  
Phylogenetic Position ◽  
Caudal Vertebra ◽  
New Genus And Species ◽  
Theropod Dinosaur ◽  
Incertae Sedis ◽  
Theropod Dinosaurs ◽  
Neural Canal ◽  
Posterolateral Margin

<em>Kemkemia auditorei</em> Cau &amp; Maganuco, 2009 was recently described as a new genus and species of theropod dinosaur on the basis on an isolated distal caudal vertebra. The holotype and only known specimen comes from Kem Kem beds (Upper Cretaceous) of Morocco. In the present paper we review the phylogenetic position of <em>Kemkemia</em> and we conclude that this taxon belongs to Crocodyliformes. It shares with crocodyliforms the presence of a concavity at the posterolateral margin of neural spines, an inflated neural canal, and reduced prezygapophyses, among other traits. This combination of characters clearly distinguishes <em>Kemkemia</em> from theropod dinosaurs. In this way, <em>Kemkemia</em> is here considered as a Crocodyliformes <em>incertae sedis</em>, and based on the absence of unique characters, the genus and species <em>Kemkemia</em> auditorei is proposed as a nomen <em>dubium</em>.

Enhancing bonebed mapping with GIS technology using the Danek Bonebed (Upper Cretaceous Horseshoe Canyon Formation, Edmonton, Alberta, Canada) as a case study

2014 ◽  
Vol 51 (11) ◽  
pp. 987-991 ◽  
Author(s):  
Katherine Bramble ◽  
Michael E. Burns ◽  
Philip J. Currie
Keyword(s):  
Information System ◽  
Upper Cretaceous ◽  
Gis Technology ◽  
Digital Map ◽  
Anatomical Information ◽  
The City ◽  
Horseshoe Canyon Formation ◽  
Specimen Identification ◽  
Upper Campanian

The Danek Bonebed is a monodominant Edmontosaurus bonebed preserving predominantly disarticulated material from the Upper Campanian Horseshoe Canyon Formation within the city limits of Edmonton, Alberta, Canada. To date, at least six dinosaur taxa have been identified at the site: Albertosaurus sarcophagus, Chasmosaurinae indet., Dromaeosauridae indet., Edmontosaurus regalis, Ornithomimidae indet., and Troodontidae indet. This bonebed has been used as a case study for creating a digital, searchable bonebed map using a geographic information system (GIS) platform. The original quarry maps produced on site are refined when digitized with new anatomical information gathered during preparation of collected specimens. Each specimen is labeled with the known specimen identification, quarry coordinates, and catalogue number. Creating a digital map of the bonebed allows easier interpretation of data and the ability to share maps to compare specific elements within the bonebed.

Systematic revision of Aquilapollenites Rouse 1957

1970 ◽  
Vol 48 (9) ◽  
pp. 1591-1601 ◽  
Author(s):  
Satish K. Srivastava ◽  
Glenn E. Rouse
Keyword(s):  
New Species ◽  
Type Species ◽  
Upper Cretaceous ◽  
Generic Diagnosis ◽  
Systematic Revision ◽  
Original Diagnosis ◽  
A New Species

The original diagnosis of the genus Aquilapollenites is inadequate. It is suitably emended here and a revised generic diagnosis is given. The validity of the genera Aquilapollenites and Pentapollenites is examined. It is concluded that Aquilapollenites has seniority over Pentapollenites.The holotypes of the type species Aquilapollenites quadrilobus and A. trialatus have been lost. These two species are redescribed in detail and their neotypes selected. A. formosus is described as a new species from the Upper Cretaceous Oldman Formation of Alberta.

scholarly journals New titanosauriform (Dinosauria: Sauropoda) specimens from the Upper Cretaceous Daijiaping Formation of southern China

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e8237
Author(s):  
Fenglu Han ◽  
Xing Xu ◽  
Corwin Sullivan ◽  
Leqing Huang ◽  
Yu Guo ◽  
...  
Keyword(s):  
Upper Cretaceous ◽  
Southern China ◽  
Character Evolution ◽  
Geographic Range ◽  
Hunan Province ◽  
Eastern Asia ◽  
Complex Patterns ◽  
Anatomical Information ◽  
Stratigraphic Interval

Titanosauriform sauropod dinosaurs were once considered rare in the Upper Cretaceous of Asia, but a number of titanosauriforms from this stratigraphic interval have been discovered in China in recent years. In fact, all adequately known Cretaceous Asian sauropods are titanosauriforms, but only a few have been well studied, lending significance to any new anatomical information that can be extracted from Asia’s Cretaceous sauropod record. Here we give a detailed description of some titanosauriform bones recovered recently from the Upper Cretaceous Daijiaping Formation of Tianyuan County, Zhuzhou City, Hunan Province, southern China. The occurrence of this material in Hunan increases the known geographic range of titanosauriforms in eastern Asia. Although all of the specimens discussed in this paper can be assigned to Titanosauriformes at least tentatively, some bones display a limited number of features that are more typical of basal sauropods and/or derived diplodocoids, suggesting complex patterns of character evolution within Neosauropoda.

A new species of Bananogmius (Teleostei: Tselfatiformes) from the Upper Cretaceous Carlile Shale of western Kansas

1999 ◽  
Vol 73 (3) ◽  
pp. 504-511 ◽  
Author(s):  
Christopher Fielitz ◽  
Kenshu Shimada
Keyword(s):  
New Species ◽  
Upper Cretaceous ◽  
Narrow Band ◽  
Lateral Side ◽  
Post Mortem ◽  
Anterior Portion ◽  
Shale Formation ◽  
A New Species

A new species, Bananogmius ellisensis n. sp., known only from the holotype, is described from the Blue Hill Shale Member (Upper Cretaceous, middle Middle Turonian) of the Carlile Shale Formation in western Kansas. The skull and anterior portion of the specimen is well-preserved and was subjected to little post-mortem deformation suggesting rapid burial. The nearly complete skull shows three characters that separate the fish from other species of Bananogmius: a straight, rather than ventrally curved dentary, a narrow band of teeth on the dentary that does not extend onto its lateral side, and a cylindrically-shaped articular condyle of the quadrate. The uncompressed preservation of the skull reveals a pair of long structures ventral to the mandible that are also found, but not described for some other Bananogmius species. Based on the positions of muscles in extant teleosts, these structures are most likely the mineralized protractor hyoidei muscles. Furthermore, these structures may be homologous with ventral structures found in Tselfatia. The presence of Bananogmius adds a new ecological component to the Blue Hill Shale fauna.

scholarly journals FRONTAL BONE ANATOMY OF TERATOPHONEUS CURRIEI (THEROPODA: TYRANNOSAURIDAE) FROM THE UPPER CRETACEOUS KAIPAROWITS FORMATION OF UTAH

2021 ◽  
pp. 51-64
Author(s):  
CHAN-GYU YUN
Keyword(s):  
Body Size ◽  
Body Mass ◽  
Upper Cretaceous ◽  
Frontal Bone ◽  
The Body ◽  
Anatomical Information

A right frontal bone belonging to the tyrannosaurid theropod Teratophoneus curriei from the Campanian Kaiparowits Formation of Utah provides important anatomical information that is useful in understanding tyrannosaurid taxonomy and relationships. Many aspects of its anatomy indicate a subadult ontogenetic status of this individual, as they compare favorably with subadults of other tyrannosaurids such as Daspletosaurus torosus and Tyrannosaurus rex. This is consistent with the previous interpretation that this individual was subadult, based on different cranial bones such as lacrimal or maxilla. It is likely that a previous assessment of the body mass of this individual was underestimated, and it is presumed here that it was most likely around 1000 kg. This description of the frontal anatomy has several implications for previous works on tyrannosaurid cranial anatomy, and information that corrects aspects of our understanding on tyrannosaurid frontal anatomy is provided. Reanalysis of Nanuqsaurus hoglundi, a tyrannosaurid theropod that has similar frontal morphology with Teratophoneus curriei, implies that parts of its diagnosis are problematic and the proposed evidence for the supposed diminutive body size of this taxon is weak.

An istiodactylid pterosaur from the Upper Cretaceous Nanaimo Group, Hornby Island, British Columbia, Canada

2011 ◽  
Vol 48 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Victoria M. Arbour ◽  
Philip J. Currie
Keyword(s):  
British Columbia ◽  
Upper Cretaceous ◽  
New Genus ◽  
East Coast ◽  
Vancouver Island ◽  
Geographic Range ◽  
Anterior Portion ◽  
Anterior Edge ◽  
Group A ◽  
Upper Campanian

An unusual jaw found in a calcite nodule from Collishaw Point, Hornby Island, British Columbia (off the east coast of Vancouver Island) represents the first definitive pterosaur found in British Columbia, and the first istiodactylid from Canada. The nodule was derived from the Northumberland Formation (Nanaimo Group), a fossiliferous formation known for producing numerous plants, invertebrates, sharks, and mosasaurs. The pterosaur is represented by the anterior portion of the rostrum, including the anterior edge of the nasoantorbital fenestra, and numerous small, triangular teeth lacking denticles. These teeth are similar in overall morphology to the teeth of istiodactylids, but are smaller, more numerous, more tightly packed, and have proportionately smaller crowns. Although fragmentary, this specimen is diagnostic and represents a new genus of istiodactylid pterosaur. Its presence in the upper Campanian Northumberland Formation makes this the latest occurring istiodactylid and extends the stratigraphic and geographic range of this enigmatic group of pterosaurs.

Ultrastructure of the Parotid Gland of the Nine-Banded Armadillo

1977 ◽  
Vol 35 ◽  
pp. 640-641
Author(s):  
J. R. Ruby
Keyword(s):  
Endoplasmic Reticulum ◽  
Parotid Gland ◽  
Periodic Acid ◽  
Acinar Cells ◽  
Duct System ◽  
Parotid Glands ◽  
Dasypus Novemcinctus ◽  
Anterior Portion ◽  
Periodic Acid Schiff ◽  
Thin Sections

Parotid glands were obtained from five adult (four male and one female) armadillos (Dasypus novemcinctus) which were perfusion-fixed. The glands were located in a position similar to that of most mammals. They extended interiorly to the anterior portion of the submandibular gland.In the light microscope, it was noted that the acini were relatively small and stained strongly positive with the periodic acid-Schiff (PAS) and alcian blue techniques, confirming the earlier results of Shackleford (1). Based on these qualities and other structural criteria, these cells have been classified as seromucous (2). The duct system was well developed. There were numerous intercalated ducts and intralobular striated ducts. The striated duct cells contained large amounts of PAS-positive substance.Thin sections revealed that the acinar cells were pyramidal in shape and contained a basally placed, slightly flattened nucleus (Fig. 1). The rough endoplasmic reticulum was also at the base of the cell.

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