Browsing by Author "ROSA, Ricardo Alexandre"

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Achado histopatológico de lipidose hepática em fetos de gambá (Didelphis sp.) lactantes
(Fundação de Ensino Octávio Bastos, 2008-11-30) GARCIA, Fernanda Figueiredo; MANÇANARES, Celina Almeida Furlanetto; MIGLINO, Maria Angélica; AMBRÓSIO, Carlos Eduardo; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de
Opossums (Didelphis sp.) Are highly reproducible marsupials, have a gestation period of approximately 12 days and extensive lactation. Fetuses receive high levels of carbohydrates and lipids from the mother during lactation. The objective of this work was describe the macro and microscopic morphology of the livers of opossum fetuses (Didelphis sp.) at different stages of their postnatal development. An old animal (5 days, 15 days, 22 days and 35 days) for macroscopic and microscopic verification of liver structures and consequent comparison with other domestic species. The animals' livers were processed and included by paraffin embedding techniques. Each block was cut and the sections were stained with HE, picrosirius, PAS histochemical reaction with hematoxylin, toluidine blue and Masson's trichrome to observe the hepatic structures. The macro and microscopic results indicate a premature development of the species in the fetal stage, similar to domestic animals and interestingly there is presence of hepatic lipidosis in all animals.
Análise comparativa entre as características morfológicas renais dos felinos domésticos (Felis catus) e grandes felídios (Puma concolor)
(Fundação de Ensino Octávio Bastos, 2023-10-18) HONÓRIO, Vinícius M.; ROSA, Ricardo Alexandre; AIUB, Plinio B.; MANÇANARES, Celina A. F.
The kidneys are paired structures covered externally by a capsule of dense connective tissue, resembling a bean grain shape, thin and well defined. They are located in the retroperitoneal space, located ventral to the transverse processes of the vertebrae in the dorsal abdominal wall, projecting cranially to the last ribs of the abdomen. For this research, four animals were used, two large felines (Puma concolor), and two domestic felines (Felis catus), so that both species went through the dissection process to recognize the structures and anatomical location of the organ under study. During the dissection process so far there has been a difference in kidney size, kidney weight and vein caliber. and renal arteries between species, in addition to the fact that one of the large felids had an extra renal vein on the right side, differentiating itself from other animals. However, it is noted that the topographic location of the kidneys of jaguars is similar to that of domestic felines. The aim of the study is to characterize the kidneys of domestic felines (Felis catus) and the kidneys of large felines (Puma concolor) in the macroscopic part, making it possible to carry out a comparative analysis of the renal morphological characteristics between the two species, to verify possible differences between they. The aim is also to obtain information that explains the appearance of changes that may predispose the occurrence of common pathologies in feline clinics.
Análise da estrutura macro e microscópica das glândulas salivares parótidas em duas espécies de procionídeos:
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2011-05-30) SANTOS, Amilton César dos; BERTASSOLI, Bruno M.; OLIVEIRA, Vanessa Cristina de; SOUZA, Aline F.; OLIVEIRA, Franciliusa D.; ROSA, Ricardo Alexandre; SILVA, Jodonai B.; CARVALHO, Ana Flávia de; MANÇANARES, Celina Almeida Furlanetto
The coati (Nasua nasua, Linnaeus, 1766) with daytime habits and the hand-pelada (Procyon cancrivorus, G. Cuvier, 1798) with twilight and nighttime habits, are terrestrial mammal species, belonging to the procionid family that are widely found in the Brazilian territory. For this work, three coatis and two hand-peeled adults from the Scientific Creation-CECRIMPAS of the University Center of the Fundação de Ensino Octávio Bastos (IBAMA 02027.003731 / 04-76) were used. These animals had already been euthanized and used in other research prior to ours. For this research, the parotid salivary glands of coatis and hand-peeled were identified, dissected, extracted, processed and prepared for observation under the optical microscope in the hematoxylin and eosin stains, picrossirius and photocumented. Macroscopically in each of the coatis and hand-peeled, a pair of parotid glands located below the parotid-auricular muscle, ventral to the auricular cartilage, can be seen, where it is in contact with the mandibular glands that are partially covered by the parotid glands. Microscopically, the parotid glands are multilobulated and are constituted by serous acini (parotid) in the coatis. The lobes of the coatis and hand-peeled parotid glands have striated intralobular ducts, lined by simple prismatic epithelium, interlobular ducts that vary their epithelium from simple cubic to bi-stratified cubic and intercalated ducts lined by simple cubic epithelium. They are composed of serous acini, similarly to that of most domestic animals, men and rodents, and unlike the results found in young dogs, lambs and some carnivores such as the ferret that has mixed acinos and some carnivores, which have serous and mucous acinos in their constitution.
Análise macroscópica comparativa do intestino do Puma Concolor e Felis Catus
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2024-10-09) MARQUES, Mariana Nogueira; RIBEIRO, Camila; MANÇANARES, Celina Almeida Furlanetto; AIUB, Plinio Bruno; VITOR, Victório Jordão; ROSA, Ricardo Alexandre
This study compared the macroscopic anatomy of the intestine of domestic cats and the Puma concolor, which is one of the largest felines in Brazil, widely distributed throughout the country, and is highly relevant as a flagship animal that suffers enormous losses due to human action. Due to its extreme national importance, the study of its anatomy is essential for academic, clinical, surgical purposes and for actions to preserve it. Since the digestive system is one of the main agents for the homeostasis of an organism, anatomical knowledge of the intestine, the largest portion of this system, is essential. The intestine of felines is divided into the small intestine, composed of the duodenum, jejunum and ileum, and the large intestine, composed of the cecum, colon and rectum. This work aims to analyze, describe and catalog the morphology of the intestine of the puma (Puma concolor) to improve anatomical knowledge of this animal for a variety of needs, such as scientific work, clinical and surgical assistance, environmental and food management, and mainly to help preserve and conserve this species.
Análise macroscópica das papilas da língua do Quati
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2010-05-30) SOUZA, Aline Fernandes de; SANTOS, Amilton César dos; OLIVEIRA, Vanessa Cristina de; ROSA, Ricardo Alexandre; CARVALHO, Ana Flavia de; MANÇANARES, Celina de Almeida Furlanetto
The coati (Nasua nasua) is an animal that belongs to the Phylum Chordata, the Mammalia Class, the Carnivorous Order and the Procyonidae Family. These animals have habits of climbing trees to breed, escape from danger and stay overnight and feed on fruits, small vertebrates, insects, nectar, eggs and vegetables. For this work, 3 orthothanized animals were used, from the Scientific Creatory (CECRIMPAS) - UNIFEOB authorized by IBAMA with the Process: nº 02027.003731 / 04-76. The techniques used were latex injection into the abdominal aorta to replenish the arterial bed, followed by fixation in a 10% formaldehyde solution. In this work, the morphology of the coati (Nasua nasua) tongue papillae was described using a macroscopic method of dissection and photographic documentation. The tongues were removed, dissected and divided into three portions: rostral, medium and caudal. Macroscopically, it can be seen that the dorsal surface of the tongue presents filiform, fungiform, ditch and conical papillae distributed in the rostral, middle and caudal regions. According to the results it can be concluded that the coati tongue has macroscopic characteristics similar to canids, varying the number of ditched papillae.
Análise macroscópica do aparelho reprodutor masculino do ouriço cacheiro
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2007-09-30) CASALS, Juliana Barbosa; BARREIRO, Juliana Regina; ROSA, Ricardo Alexandre; MANÇANARES, Celina Almeida Furlanetto; FAVARON, Phelipe Oliveira; CARVALHO, Ana Flávia de; MIGLINO, Maria Angélica; MARQUES, Leandro de Oliveira; ANDRADE, Filipe Ian Bindez de; NASCIMENTO, Priscila Leal do; FERRAZ, Ana Cláudia Cristiane; AMBRÓSIO, Carlos Eduardo
Rodents comprise most of the mammalian class. There are currently 2,021 species, organized into 443 genera and 29 families. Hedgehogs (Coendou villosus), are animals that in captivity, reproduce with some ease and become tame. In the urban and metropolitan region their presence is becoming common and this can be identified by the number of accidents involving dogs in the yard, registered in veterinary clinics. This work aimed to describe macroscopically the reproductive apparatus of Coendou villosus (hedgehog) to better clarify the anatomy of this important organ in the wild rodent model, since very little is known about this species. We compared the results obtained with other rodent species already studied. For the macroscopic description of the male reproductive system, 2 animals from donations were used, these animals ended up dying after attack by dogs.
Análise microscópica comparativa do intestino da Puma Concolor e Felis Catus
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2024-10-09) RIBEIRO, Camila; MARQUES, Mariana Nogueira; MANÇANARES, Celina Almeida Furlanetto; AIUB, Plinio Bruno; VITOR, Victório Jordão; ROSA, Ricardo Alexandre
This study compared the microscopic anatomy of the intestine of Puma concolor with that of the domestic cat in order to describe, evaluate and catalog the differences and similarities in the intestinal morphology of these species. The intestine is the largest portion of the digestive system and is extremely important for the proper functioning of the organism. Under microscopy, both intestines have mucosal, submucosal, muscular and serous layers; however, only the small intestine has villi, while this structure is absent in the large intestine. The microscopic intestinal anatomy of domestic and wild felines is similar. The puma is one of the largest felines in Brazil, widely distributed throughout the national territory, and is highly relevant in the country. Furthermore, it is a national animal and suffers enormous losses due to human actions. Therefore, this research aims to enrich the anatomical knowledge of Puma concolor to assist in clinical and surgical care, environmental management, and mainly in the preservation of this species.
Análise microscópica do estágio de ossificação do gambá (DIDELPHIS SP.) em diferentes estágios fetais através da diafanização e do exame radiográfico
(Fundação de Ensino Octávio Bastos, 2008-11-30) GARCIA, Fernanda Figueiredo; MANÇANARES, Celina Almeida Furlanetto; ALVES, Jeferson Douglas Soares; ROSA, Ricardo Alexandre; MIGLINO, Angélica; AMBRÓSIO, Carlos Eduardo; CARVALHO, Ana Flávia de
Opossums (Didelphis sp.) Are marsupials that have a very short gestation period, therefore, their offspring are born immature and will end their development in the mother's marsupium. Because they are very early in their development, in the fetal stage of these animals, they already have premature growth of their organs and tissues as a whole. The objective of this work was to describe the ossification stages of opossum fetuses (Didelphis sp.) At different postnatal stages, through diaphanization and radiographic examination. One animal of each age (5 days, 15 days, 22 days and 35 days) was used to verify ossification and consequent comparison with other domestic species. The results indicate a premature ossification of the species in the fetal stage, unlike domestic animals.
Características, lobação e segmentação de pulmões dos Quatis
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2010-05-30) SANTOS, Amilton César dos; OLIVEIRA, Vanessa Cristina de; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de; MANÇANARES, Celina Almeida Furlanetto
The coati (Nasua nasua) is a procionid with a flexible snout, small eyes and ears, which have long canines. They are omnivorous animals with diurnal, terrestrial and arboreal habits, which feed mainly on fruits and small invertebrates. For this work, 3 orthothanized animals were used, coming from the Scientific Creatory (CECRIMPAS) - UNIFEOB authorized by IBAMA as Process: nº 02027.003731 / 04-76. The techniques used were latex injection into the abdominal aorta to replenish the arterial bed, followed by fixation in a 10% formaldehyde solution. The coatis lungs were collected, analyzed macroscopically to establish the pulmonary lobation, where 4 pulmonary lobes (cranial, middle, accessory and caudal) can be found on the right side of the coatis lung and 2 left lobes (cranial and caudal). Then, the hilum was identified to check the bronchial behavior before penetrating the pulmonary parenchyma, and then the dissection started, determining the bronchipulmonary segmentation of the coatis, where it was found that the bronchial tree of the coatis has 24 segmental bronchi.
Caracterização macroscópica do funículo umbilical de búfalos
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2001-11-30) FERREIRA, Guilherme J. B.C.; CARVALHO, Ana Flávia de; AMBRÓSIO, Carlos Eduardo; MIGLINO, Maria A.; ROSA, Ricardo Alexandre; ESTEVES, Alessandra; THOMAZ, Juliana M.
The umbilical funiculus is the organ that connects the fetus to the placenta where blood and excreta from the fetus pass. Arterial blood flows from the placenta to the fetus through the umbilical veins and venous blood through the arteries, the excretion is carried through the allantoic duct. In this study, nine fetuses were used, which had their funicles measured and dissected, in order to establish developmental correlations and describe their morphology. The funnel was rod-shaped, a parallel arrangement of the vessels in the fetal just portion and a standard ruminant arrangement in the just portion - placental and middle.
Classificação macroscópica dos dentes de Nasua nasua
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2009-09-30) PIREI, Naira Caroline Godoy; MANÇANARES, Celina Almeida Furlanetto; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de; BERTASSOLI, Bruno M.
Nasua nasua, also known as coati, is an omnivorous mammal, with wide distribution throughout South America, found from Colombia to Argentina and in Brazil it occupies all regions. The evolution caused in the teeth of mammals multiple variations, adapting the most diverse diets. Due to these variations, it is possible to classify vertebrates by order, gender and family. This work aimed to morphologically classify the teeth of males and females Nasua nausa, in order to classify and compare them with each other and with the morphology of Cannis familiaris (dogs) teeth described in the literature. In this study, five heads of Nasua nasua were used, adults, of both sexes, provided by the scientific breeding CECRIMPAS (UNIFEOB). Two macerated animals had their oral cavity exposed for the photographic documentation of the position of the teeth. In the oral cavity of Nasua nasua due to sexual dimorphism, it was possible to compare the male and female dentition macroscopically. The female has smaller teeth, rounded canines, and the incisor group on the lower part is smaller than on the upper and in the male they are pointed and larger. The animals presented 2x dental formula (I3 / 3, C1 / 1, P4 / 4, M2 / 2), with I = incisors, C = canines, P = premolars and M = molars, in a total of 40 teeth.
Desenvolvimento das membranas fetais em carnívoros (Canis familiaris, Linnaeus, 1758)
(Fundação de Ensino Octávio Bastos, 2004-09-30) WENCESLAU, Cristiane V.; MIGLINO, Maria Angélica; AMBRÓSIO, Carlos Eduardo; CARVALHO, Ana Flávia de; OLIVEIRA, Priscila C. de; FIORAVANTE FILHO, Nivaldo; ROSA, Ricardo Alexandre; MANÇANARES, Celina Almeida Furlaneto
The present study aims to provide morphological subsidies that can contribute to research in the processes of biotechnology of reproduction, as well as in vitro fertilization, cloning and obtaining stem cells, since this process in carnivores is complex and complicated. Therefore, our proposal aims at describing the structures and evolution of fetal membranes in dogs, including the process of involution of the yolk sac.
Desenvolvimento embrionário do fígado e do pâncreas de embriões e fetos bovinos
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2009-09-30) SANTOS, Ana Paula de Almeida; MANÇANARES, Celina Almeida Furlanetto; CARVALHO, Ana Flávia de; ROSA, Ricardo Alexandre
In domestic mammals, the increase in production rates as well as the greater dissemination of superior genetic material in herds, has been the subject of intense studies and investments, which has allowed a great advance and development of several biotechnologies related to animal reproduction. In cattle, most organs and body parts are formed between the 2nd and 6th week of gestation. During this period, the digestive tract, lungs, liver and pancreas develop from the primitive intestine, and the beginnings of the muscular, skeletal, nervous and urogenital system are established. In the course of development, the epithelial components of the digestive tract are derived from the endoderm that lines the primitive intestine and the connective and muscular components. Approximately 25 to 45% of bovine embryos are lost until the final implantation process. Due to the scarce literature related to organogenesis and the growth of technological innovations linked to bovine reproduction, the present study aims to study based on the normal development of the pancreas and liver of bovine embryos, thus generating a comparison for the understanding of numerous deformities and anomalies frequently encountered.
Estudo da pluripotencialidade do fígado fetal canino nos diferentes períodos gestacionais
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2007-09-30) VIEIRA, Eduardo; MARTINS, Daniele dos Santos; WENCESLAU Cristiane Valverde; AMBRÓSIO, Carlos Eduardo; CARVALHO, Ana Flávia de; ROSA, Ricardo Alexandre; MIGLINO, Maria Angélica
The study of the differentiation capacity of some cells, called stem cells or '' sistem '' cells represents an important tool for understanding and developing new research, as well as an enormous potential for discovering the treatment of numerous diseases. These embryonic stem cells are pluripotent, capable of multiplication and differentiation, and can proliferate in several cell types depending on the culture conditions. The identification of factors that lead to the direction of the cell differentiation process will allow, from embryonic stem cells, the culture to be carried out in a controlled manner among the most different cell types, making bioengineering possible. In this work, cells of the canine fetal liver were studied. The liver performs an important hematopoietic function during fetal development, while in the adult it has a multiplicity of functions such as: bile excretion, storage, synthesis and biotransformation. The livers, for study, were obtained from fetuses with gestational age with an average of 25, 35, 45 and 55 days, from females of mixed breed dogs that underwent ovariosalpingohesterectomy. These canine fetal liver cells were analyzed histologically to characterize cell differentiation, using previously established histological methods.
Estudo dos dentes de Guaiaquica
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2011-05-30) LOBO, Luis M.; SANTOS, Amilton César dos; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de; MANÇANARES, Celina de Almeida Furlanetto
The guaiquica (Gracilinanus microtarsus), belongs to the family Didelphidae, which is a very important family among marsupials, because in addition to containing many species (like opossums), it represents the model group of marsupials. Marsupial ancestors, from the Cretaceous period, had morphological characteristics very similar to those of today's Neotropical skunks. For this reason, their reproductive adaptations are considered directly related to primitive marsupials, and this similarity is of great interest for the comparative study of their biology. The teeth together with the gums, the temporomandibular and symphysial joints of the jaws, and also the masticatory muscles, constitute the masticatory apparatus. This work aims at the morphological characterization of the teeth of guaiquica for a better understanding of evolutionary aspects related to marsupials and other mammals.
Estudo macroscópico de estômago de Mocó
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2008-11-30) FERRAZ, Ana Cláudia Cristiane; ROSA, Felipe Gonçalves; MANÇANARES, Celina de Almeida Furlanetto; SILVA, Angélica do Rocio Carvalho; AMBRÓSIO, Carlos Eduardo; OLIVEIRA, Moacir Franco; ROQUETO, Marco Antônio; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de
Four stomachs were used for macroscopic analysis. Stomachs were measured, photographed and dissected according to biometry and anatomy techniques. The 4 stomachs were similar in terms of their external and internal anatomical characteristics, with greater, lesser curvature and cardiac, funicular and pyloric regions, respectively. The shape was also similar to that of other domestic animals, and there was no statistically significant difference between the equal regions measured or in terms of their height, however, there was variation between two different structures (greater and lesser curvature). It was concluded that the stomachs of mocós are anatomically similar to those of other domestic monogastrics and rodents already studied.
Estudo macroscópico do aparelho respiratório do Quati (Nasua nasua)
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2010-05-30) OLIVEIRA, Vanessa Cristina de; SANTOS, Amílton Cesar dos; BERTASSOLI, Bruno Machado; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de; MANÇANARES, Celina Almeida Furlanetto
The coati (Nasua nasua) is a long-snouted procionid, small eyes and ears, which have long canines. Their color varies according to body regions, they are omnivorous animals with diurnal, terrestrial and arboreal habits, which feed mainly on fruits and small invertebrates. For the macroscopic description of the coati respiratory system (Nasua nasua), 5 orthothanged animals were used, which were used in other research carried out at this institution, from the Scientific Creatory (CECRIMPAS) - UNIFEOB authorized by IBAMA as the Process: nº 02027.003731 / 04-76 . These animals were already fixed in a 10% aqueous solution of formaldehyde. The structures were identified, dissected and photo-documented. The respiratory system comprises the lungs in a system of tubes that communicate the lung parenchyma with the external environment. In the coati the nose is located in a nasal plane with a pointed shape and facing top, with its nostrils, it has the dorsal nasal concha and the ventral nasal concha, with dorsal and ventral nasal meatus.The larynx has the four cartilages the arytenoid, cricoid, epiglottis and The trachea is a cartilaginous tube that contains tracheal rings. The lungs are subdivided into lobes by deep interlobar fissures, the right lung is divided into 4 lobes and is larger than the left while the left lung has only 2 lobes. We have concluded so far that the coati respiratory system is similar to the findings described in the literature for domestic carnivores.
Estudo macroscópico do coração e pulmão de Mocó
(Fundação de Ensino Octávio Bastos, 2008-11-30) FERRAZ , Ana Cláudia Cristiane; NASCIMENTO, Priscila Leal do; CARVALHO, Ana Flávia de; OLIVEIRA, Moacir Franco; ROQUETO, Marco Antônio; ROSA, Ricardo Alexandre; MANÇANARES, Celina de Almeida Furlanetto
For this research, three hearts and three lungs of mocó (Kerodon rupestris) were used, coming from the ESAM Scientific Creatory (School of Agriculture of Mossoró - CEMAS) accredited at IBAMA RN-12-492-004. These organs were measured and macroscopically analyzed. The right and left lungs were macroscopically similar, with the right lung being slightly larger, spongy, multilobed aspect and involved by the visceral pleura. The right lung had a cranial lobe, medium, caudal and accessory subdivided into lateral and medial portion. The left lung showed the cranial lobe subdivided into a cranial and caudal portion, a caudal lobe and an accessory lobe. The anatomical structures of the mocó heart are similar to those of the carnivores, with a rounded apex, a thick interventricular septum and a more pronounced paraconal interventricular branch of the left coronary artery.
Estudo macroscópico do nervo isquiático do Quati (Nasua nasua) e suas ramificações
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2009-09-30) SANTOS, Amilton César dos; MANÇANARES, Ana Carolina Furlanetto; BERTOSSOLI, Bruno Machado; CARLOS, Camila Zeferino; SILVA, Flávia Martins da; BENATO, Talita Mascarim; OLIVEIRA, Vanessa Cristina de; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de; MANÇANARES, Celina Almeida Furlanetto
The coati (Nasua nasua) is a procionid with a flexible snout, small eyes and ears, which have long canines. They are omnivorous animals with diurnal, terrestrial and arboreal habits, which feed mainly on fruits and small invertebrates. This omnivore has been constituted in an important group among the animals submitted to different studies, which is extremely important even for the understanding of its own evolution, adding to the fact that detailed knowledge of its Anatomy can represent an important factor for their preservation and protection. The objective of this research is, is to know the anatomical aspects of the sciatic nerve, its origin and composition, aiming at a better understanding of the innervation of the pelvic limb of this animal. For this work, 3 orthothanged animals were used, from the Scientific Creatory (CECRIMPAS) -UNIFEOB authorized by IBAMA as the Process: nº 02027.003731 / 04-76. The techniques used were latex injection into the abdominal aorta to replenish the arterial bed, followed by fixation in a 10% formaldehyde solution. The sciatic nerve and its branches were dissected, measured and photo documented. After analyzing the pieces studied, we could observe that the largest nerve in the coati's body is the sciatic nerve, as well as in the feline, swine and goat. This one The nerve derives its fibers essentially from the ventral branches of the lumbar nerves and from the sacral nerves that make up the lumbosacral plexus.
Estudo macroscópico dos dentes de Guaiaquica
(Centro Universitário da Fundação de Ensino Octávio Bastos, 2011-05-30) LOBO, Luis M.; SANTOS, Amilton César dos; ROSA, Ricardo Alexandre; CARVALHO, Ana Flávia de; MANÇANARES, Celina de Almeida Furlanetto
The guaiquica (Gracilinanus microtarsus), belongs to the family Didelphidae, which is a very important family among marsupials, because in addition to containing many species (like opossums), it represents the model group of marsupials. Marsupial ancestors, from the Cretaceous period, had morphological characteristics very similar to those of today's Neotropical skunks. For this reason, their reproductive adaptations are considered directly related to primitive marsupials, and this similarity is of great interest for the comparative study of their biology. The teeth together with the gums, the temporomandibular and symphysial joints of the jaws, and also the masticatory muscles, constitute the masticatory apparatus. This work aims at the morphological characterization of the teeth of guaiquica for a better understanding of evolutionary aspects related to marsupials and other mammals.