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Registros recuperados: 14
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A new protodidelphid (Mammalia, Marsupialia, Didelphimorphia) from the Itaboraí Basin and its implications for the evolution of the Protodidelphidae Anais da ABC (AABC)
CARNEIRO,LEONARDO M..
Abstract The Protodidelphidae was a group of marsupials that lived in Gondwana from the early to middle Eocene. Among South American faunas, the Itaboraí Basin calls attention by the presence of four genera and six species. Herein is described Bergqvistherium primigenia gen. et sp. nov., a new protodidelphid from the Itaboraí Basin - lower Eocene. This taxon differs from other protodidelphids in the smaller size, developed entocristid, less brachyo-bunoid adaptations, and entoconid more mesial than the hypoconid. These characters are recovered as plesiomorphies of the Protodidelphidae, supporting Bergqvistherium as an early-divergent lineage of this group. The Protodidelphidae fauna of the Itaboraí Basin is represented by less specialized “basal” taxa,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Metatheria; Paleogene; Systematics; Teeth.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400507
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A new species of Tyttocharax (Characiformes: Characidae: Stevardiinae) from the Güejar river, Orinoco river Basin, Colombia Neotropical Ichthyology
Román-Valencia,César; García-Alzate,Carlos A.; Ruiz-C,Raquel I; Donald,C; Taphorn,B.
A new Tyttocharax species from the Güejar River system, near the Macarena Mountains in Colombia is described. This is the first record for the genus from the Orinoco basin. The combination of the following characters distinguish Tyttocharax metae from its congeners: presence of bony hooks on the pectoral and caudal-fin rays; bony hooks on the anal-fin rays larger than those on the pelvic-fin rays; pectoral-fin rays i,5-6,i; presence of three unbranched dorsal-fin rays; absence of an adipose fin; four scales rows between the anal-fin origin and the lateral line; and four scale rows between the pelvic-fin and the lateral line. Ecological characteristics of the habitat of the new species are also presented.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geographic distribution; Neotropical fish; Osteology; Scales; Teeth.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300004
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Anomalias e patologias dentárias em Arctocephalus G. Saint-Hilaire & Cuvier (Pinnipedia, Otariidae) da costa do Rio Grande do Sul, Brasil Zoologia
Drehmer,César Jaeger; Ferigolo,Jorge.
The studied species were Arctocephalus australis (Zimmermann, 1783) and Arctocephalus tropicalis (Gray, 1872), (five specimens of each one). Anomalies were discussed under the light of theories which relate the ancestry of pinnipeds with the Ursidae; as well as concerning the evolutionary trends supposed for the Otariidae. Pathologies were related to alimentary and reproductive habits.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pinnipedia; Otariidae; Arctocephalus; Anomaly; Pathology; Teeth.
Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751996000400008
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Biomechanical analysis of the masticatory movement before and after adjusting dental occlusion in equine Arq. Bras. Med. Vet. Zootec.
Paiva Neto,A.O.; Leite,C.T.; Duarte,C.A.; Dias,D.P.M.; Döwich,G.; Queiroz Neto,A.; Lacerda Neto,J.C..
ABSTRACT The aim of this study was to evaluate through three-dimensional kinematic analysis the influence of occlusal adjustment by tooth wear in masticatory biomechanics of horses. Seven clinically healthy thoroughbred Arabian horses with strong occlusal irregularities were used, of which seven castrated males and one female of between seven and nineteen years of age. Three digital video cameras and seven spherical reflective markers placed on the horses’ face were employed. The animals were filmed twice in succession: while chewing hay before and after the occlusal adjustment by tooth wear. Following that, kinematic analysis was made of the movements obtained by means of the images which were synchronized, segmented and reconstructed three-dimensionally...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Kinematics; Teeth; Chewing; Occlusion; Dentistry.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000100006
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Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supraspecific taxa of Chondrichthyan fishes. Part A: Selachii. 1: Order: Hexanchiformes - Family: Hexanchidae. Commissural teeth OMA
Herman, J.; Hovestadt-Euler, M.; Hovestadt, D.C..
The commissural teeth of the Hexanchidae are for the first time described and illustrated. The morphology allows a direct generic assignment.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal morphology; Taxonomy; Teeth; Chondrichthyes; Hexanchidae [Cow sharks].
Ano: 1987 URL: http://www.vliz.be/imisdocs/publications/294440.pdf
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Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supra-specific taxa of Chondrichthyan fishes. Part B. Batomorphii: 1c. Order Rajiformes - Suborder Rajoidei - Family: Rajidae - Genera and Subgenera: <i>Arhynchobatis, Bathyraja richardsoni-</i>type, <i>Cruriraja, Irolita, Notoraja, Pavoraja (Insentiraja), Pavoraja (Pavoraja), Pseudoraja, Raja (Atlantoraja), Raja (Okamejei)</i> and <i>Rhinoraja</i> OMA
Herman, J.; Hovestadt-Euler, M.; Hovestadt, D.C.; Stehmann, M..
Part B, Nos. 1a and 1b of this series, comprising of the Batomorphii the first and the second sections on the Rajoidei, is continued with the last group of rajoid taxa as far as material was available. The tooth morphology of representatives of eleven more genera and subgenera, namely <i>Arhynchobatis, Bathyraja richardsoni-type, Cruriraja, Irolita, Notoraja, Pavoraja (Insentiraja), Pavoraja (Pavoraja), Pseudoraja, Raja (Atlantoraja), Raja (Okamejei)</i> and <i>Rhinoraja</i>, is described and illustrated by SEM-photographs. Differential diagnoses and systematic interpretations are presented as a result of the odontological examinations described here and in the previous two issues 1a and 1b for the supraspefic taxa of the Rajoidei.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Functional morphology; Marine fish; Taxonomy; Teeth; Rajiformes.
Ano: 1996 URL: http://www.vliz.be/imisdocs/publications/294448.pdf
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Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supraspecific taxa of Chondrichtyan fishes. Part A. Selachii. 2b: Order: Carcharhiniformes - Family: Scyliorhinidae OMA
Herman, J.; Hovestadt, D.C.; Hovestadt-Euler, M..
The tooth morphology of all the genera and subgenera of the Scyliorhinidae, with the unique exception of <i>Pentanchus</i> (not available for examination), is described and illustrated. Several systematic considerations are given. The odontology of the genera <i>Centroscyllium</i> and <i>Aculeola</i>, which are rather aberrant among the Squaliforms, is compared with that of all the Scyliorhinidae taxa presently described.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal morphology; Centroscyllium; Teeth; Scyliorhinidae [cat sharks].
Ano: 1990 URL: http://www.vliz.be/imisdocs/publications/294442.pdf
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Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supraspecific taxa of Chondrichtyan fishes. Part A: Selachii. 3: Order: Squaliformes - Families: Echinorhinidae, Oxynotidae and Squalidae OMA
Herman, J.; Hovestadt-Euler, M.; Hovestadt, D.C..
The teeth of nearly all supraspecific taxa of squaliformes are described and illustrated by SEM photos. The tooth morphology allows a direct assignment to all these taxa and some proposals of taxonomic adjustments. The results support opinions of other authors, that Echinorhinidae represent a separate order, Oxynotidae coincide odontologically with Squalidae; Squalid genera could be grouped into 8 subfamilies, 4 of which could not be defined hitherto; <i>Centroselachus</i> Garman, 1913 is confirmed and should be revalidated; significant odontological differences do not exist between <i>Cirrhigaleus</i> and <i>Squalus, Lepidorhinus</i> and <i>Centrophorus, Scymnodon</i> and <i>Scymnodalatias</i>,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal morphology; Identification keys; Teeth; Squalidae [Dogfish sharks].
Ano: 1989 URL: http://www.vliz.be/imisdocs/publications/294441.pdf
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Dentición y remplazo dental en algunos tiburones Carcharhinidos del Pacífico colombiano OceanDocs
Díaz-M., J.M..
Las mandíbulas secas de cuatro especies de tiburones carcharh inicios (Galeozerdo cuvieri, Carcharhinus albimarginatus, C. galapaguensis y C. porosus) del Pacífico oriental tropical fueron examinadas para determinar las tasas de remplazo dental de cada especie. En general, las tasas de remplazo fueron mayores en la mandíbula inferior que en la superior, y esta diferencia fue más grande en aquellas especies en las que la diferenciación morfológica entre los dientes superiores e inferiores es más notable. Además, las mandíbulas cuyos dientes tienden a ser más anchos que largos tienen tasas de remplazo menores que aquellas cuyos dientes tienden a ser más largos que anchos. Esto es debido posiblemente a la mayor capacidad de tensión de los dientes anchos y a...
Tipo: Journal Contribution Palavras-chave: Marine fish; Teeth; Teeth; Http://aims.fao.org/aos/agrovoc/c_7650.
Ano: 1979 URL: http://hdl.handle.net/1834/3949
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Estimating head and body length in fossil rodents Naturalis
Freudenthal, M.; Martín-Suárez, E..
We present estimates for head and body length (HBL) of fossil rodents. We assembled HBL data and tooth row length data (LTR, UTR) for a large number of extant rodents, and calculated regression lines of HBL on LTR and UTR for all rodents together (all-rodents equation), and for separate taxonomic groups (family equations). In fossil rodents, data for complete tooth rows are scarce, therefore we use the sum of the lengths of the teeth (LRsum, URsum) as a surrogate for tooth row length. The relation between this parameter and real tooth row length (LTR, UTR) is calculated on the basis of a number of populations for which both parameters are available. We estimate HBL of fossil rodents, using LRsum and URsum and the regression lines of extant rodents, and we...
Tipo: Article / Letter to the editor Palavras-chave: Rodentia; Body mass; Teeth; Tooth row length.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/607530
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Gross and Morphometrical Studies on Mandible of Blackbuck (Antelope cervicapra) International Journal of Morphology
Choudhary,Om Prakash; Singh,Ishwer; Bharti,Sanjay Kumar; Mohd,Khan Idrees; Sathapathy,Srinivas; Mrigesh,Meena.
The present study has been done on the mandible of blackbuck. The mandible was a paired bone. It was the largest bone of the skull, and it was made up of two halves, which were united with immovable articulation forming mandibular symphysis. It presented for description three surfaces and three borders. The lingual sur-face was smooth and concave. Its symphyseal surface was rough and irregular. The most prominent part of the curve of the ramus formed the angle of the jaw; the part of the ramus between the body and the angle was called horizontal part and carries the lower cheek teeth. The part of the ramus above the angle was termed the vertical part. The vertical part of ramus was non-tooth bearing, expanded vertical part of mandible. Each ramus presented...
Tipo: Journal article Palavras-chave: Blackbuck; Mandible; Ramus; Teeth.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200003
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Growth of the skull of the Harbour Porpoise, Phocoena Phocoena (Linnaeus, 1758), in the North Sea, after age determination based on dentinal growth layer groups Naturalis
Noldus, L.P.J.J.; Klerk, R.J.J. De.
This study of the Harbour Porpoise Phocoena phocoena (Linnaeus, 1758) has been undertaken in order to find out whether differences in size and growth rate between the skulls of males and females could be demonstrated. Stuart & Morejohn (1980) have established this phenomenon in the population of the north-eastern Pacific. The material on which this study is based, consists of 76 skulls present in the collection of the Rijksmuseum van Natuurlijke Historie (RMNH), Leiden. They all belong to specimens stranded on the Dutch coast. In order to determine the age, of all these specimens the number of dentinal growth layer groups (GLG) in the teeth was counted. Thereupon 32 cranial characters were measured of each skull; these measurements were plotted against...
Tipo: Article / Letter to the editor Palavras-chave: Mammalia; Cetacea; Phocoenidae; Phocoena phocoena; North Sea; Skull; Growth; Teeth; Age determination; 42.84.
Ano: 1984 URL: http://www.repository.naturalis.nl/record/319036
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Previously undescribed dental arrangement among electric knifefishes, with comments on the taxonomic and conservation status of Tembeassu marauna Triques (Otophysi: Gymnotiformes: Apteronotidae) Neotropical Ichthyology
Campos-da-Paz,Ricardo.
Recent study of the type-material of Tembeassu marauna, a poorly-known species currently represented in collections only by its holotype (male) and paratypes (male and female), all collected forty years ago at the Ilha Solteira reservoir area, upper Paraná river region, revealed an unique pattern of dental arrangement among members of the order Gymnotiformes. This autapomorphic condition refers to a patch of around 15 elongate conical, extra teeth associated to soft tissue, and disposed inside the mouth on a restricted area at the roof of oral cavity and located just in front of the premaxillary bones (although clearly apart from those). Besides this obvious feature, two additional conditions are recognized as possibly unique for T. marauna, which refer to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apteronotus; Gymnotiforms; Mouth; Osteology; Teeth; Upper Paraná.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300007
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Tooth Root Size, Chewing Muscle Leverage, and the Biology of Homunculus patagonicus (Primates) from the late early Miocene of Patagonia Ameghiniana
Perry,Jonathan M. G.; Kay,Richard F.; Vizcaíno,Sergio F.; Bargo,M. Susana.
Inferences about the diet of Miocene platyrrhine monkeys have relied upon the morphology of the molar teeth, specifically the crests on the molars. Using a library of Micro-CT images of a broad comparative sample of living platyrrhines (callitrichines, cebines, pitheciids and atelids), late early Miocene Homunculus, and the early Miocene Tremacebus and Dolichocebus, we extend these inferences by examining the surface areas of the tooth roots, anchor points for the periodontal ligaments. From muscle scars on the skull, we estimate the mechanical leverage of the chewing muscles at bite points from the canine to the last molar. Extant platyrrhines that gouge bark to obtain exudates do not have especially large canine roots or anterior premolar roots compared...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Primates; Platyrrhini; Homunculus; Miocene; Teeth; Diet.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142010000300007
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