Ontogeny of the Postcranial Axial Skeleton of Melanosuchus niger (Crocodylia, Alligatoridae)

This study proposes the description of the development of the postcranial axial skeleton, including vertebrae, gastralium, ribs, sternum, and interclavicle, in Melanosuchus niger. Six nests were marked and two eggs removed from each nest at 24-hr intervals until hatching. For posthatching evaluation, 30 hatchlings were kept in captivity and one exemplar was euthanized at three-day intervals. Samples were diaphanized using potassium hydroxide (KOH), alizarin red S, and Alcian blue. A routinely generally used method was applied for histological evaluation. It was difficult to define in which vertebrae the development of cartilaginous centers began, but it was possible to observe that this condensation advanced in the craniocaudal direction. The condensation started in the vertebral arches and was visibly stronger in the cervical and dorsal regions, advancing to the lumbar, sacral and, last, to the caudal region. The atlas showed a highly different morphology compared with the other cervical vertebrae, with a short intercenter, two neural arches, and a proatlas. The ossification process began in the body of cervical vertebrae III to VIII and alizarin retention decreased in the last vertebrae, indicating a craniocaudal direction in bone development, similar to cartilage formation. In the histological sections of gastralium and interclavicles of M. niger at several development stages, it was possible to observe that these elements showed intramembranous development. Anat Rec, 301:607-623, 2018. © 2017 Wiley Periodicals, Inc.

Ontogenia dos ossos da cintura peitoral e membros torácicos em embriões de Podocnemis unifilis / Bone ontogeny of the pectoral girdle and thoracic members of the Podocnemis unifilis embryos

Os Testudines abrangem um grupo restrito que combinam aspectos primitivos e derivados, por exemplo, no esqueleto de seus membros. Para descrever a ontogenia do esqueleto da cintura peitoral e membros torácicos de Podocnemis unifilis, sessenta e seis embriões foram clareados e os ossos corados para a evidenciação da sequência de formação de seu esqueleto, que começa concomitantemente pelos ossos úmero, rádio e ulna, no estágio 20, estando todos os ossos da cintura peitoral com centros de ossificação corados no final deste estágio, mesmo período onde os metacarpos também se ossificam, primeiro pelos MCIV e MCIII, seguido para os ossos MCII>MCI>MCV. Entre os estágio 21 e 22 todas as falanges apresentam centros de ossificação marcados com Alizarina, primeiro as falanges médias e distais, e por ultimo as proximais. Apenas no início do estágio 24 os carpos iniciam sua ossificação, primeiro com o osso intermédio do carpo, distal do carpo IV e central do carpo III, seguidos pelos demais até o estágio 25 onde o pisiforme é o ultimo a apresentar seu centro de ossificação. A cronologia dos eventos ontogênicos nas diferentes espécies de répteis pode diferir substancialmente, mas o padrão em P. unifilis é similar ao dos demais Testudines.

EFEITOS DA ADMINSTRAÇÃO DO MIDAZOLAM EM DOSES DIFERENTES EM JIBOIAS Boa constrictor LINNAEUS, 1758 (SQUAMATA: BOIDAE)

Resumo Objetivou-se comparar os efeitos de duas doses de midazolam em Boa constrictor. Utilizaram-se 20 jiboias, divididas em dois grupos. O grupo 1 (G1), composto por dez animais, recebeu 1 mg/kg de midazolam e o grupo 2 (G2), também com dez animais, 2 mg/kg, pela via intracelomática. Os animais do G1 apresentaram déficit de tônus da cabeça, tônus muscular, manipulação e locomoção por 3,89 ± 1,18 horas e os representantes do G2 por 5,47 ± 2,08 horas. Nenhuma jiboia, em ambos os grupos, manifestou ausência de reação postural de endireitamento ou alcançaram sedação profunda; entretanto, observou-se redução da agressividade, intenso relaxamento muscular e uma dificuldade de serpentear em todos os exemplares. O tempo de retorno às condições pré-sedativas foi de 4,65 ± 1,22 horas para o G1 e de 6,2 ± 2,37 horas para o G2. Não foram observadas diferenças significativas nas avaliações da frequência cardíaca e respiratória entre os grupos. Concluiu-se assim que 1 mg/kg de midazolam provoca nas jiboias o mesmo efeito que 2 mg/kg, porém na menor dose o tempo de recuperação é menor, podendo ser utilizado para a contenção farmacológica de Boa constrictor, ou em associações que visem um efetivo relaxamento muscular.

CRANIOMETRIA EM LOBOS-GUARÁ Chrysocyon brachyurus ILLIGER, 1815 (CARNIVORA, CANIDAE)

Resumo Os objetivos do presente trabalho foram obter mensurações em crânios de Chrysocyon brachyurus adultos, caracterizar valores craniométricos para a espécie e observar se a classificação craniométrica de cães domésticos é adequada para o lobo-guará. Foram utilizados sete crânios de lobo-guará adultos, sem distinção de sexo. Determinou-se a localização de nove pontos craniométricos utilizados em cães domésticos para o lobo-guará. Os pontos foram referência para as 18 medidas craniométricas utilizadas para o cálculo de seis índices craniométricos. Os índices craniométricos são: cefálico 96,147 ± 3,89 mm, crânio facial 1,06 ± 0,20 mm, do neurocrânio 61,68 ± 1,83 mm, facial 100,06 ± 3,36 mm, basal 29,79 ± 1,18 mm, e do forame magno 89,25 ± 7,82 mm. A classificação em braquicefálico, dolicocefálico ou mesaticefálico não se adequa a Chrysocyon brachyurus.

ANATOMIA ÓSSEA E MUSCULAR DA ESCAPULA E BRAÇO DE Chrysocyon brachyurus (CARNÍVORA, CANIDAE)

Resumo O Lobo-guará Chrysocyon brachyurus - Illiger, 1815, é o maior canídeo da América do Sul, distribuindo-se na região central desse continente, preferencialmente em biomas descampados. Pode atingir entre 20 e 33 kg e até 125 cm de altura. Encontra-se em ameaça de extinção. O conhecimento anatômico é de grande importância para a complementação das informações acerca das espécies silvestres e para implicações clínicas, cirúrgicas e conservacionistas. Objetivou-se descrever os ossos e respectivos acidentes ósseos pertencentes ao cíngulo do membro torácico da região braquial e respectivos músculos do lobo-guará, por meio dos procedimentos de dissecação em animais preservados em solução de formol a 10%. Os animais pertencem ao acervo didático do Laboratório de Ensino e Pesquisa em Animais Silvestres da UFU e são provenientes de atropelamentos. Os ossos são: escápula e úmero. Não foi observada a clavícula. Os músculos são: M. deltoide; M. supraespinhal; M. infraespinhal; M. redondo maior; M. redondo menor; M. tríceps braquial cabeças: lateral, acessória, longa e medial; M. ancôneo; M. bíceps braquial; M. subescapular; M. coracobraquial; M. tensor da fáscia do antebraço; M. braquial. A escápula e o braço têm acidentes específicos, porém são semelhantes aos dos cães domésticos. O úmero é reto. Os músculos apresentam algumas peculiaridades.

Brachial Plexus in the Pampas Fox (Lycalopex gymnocercus): a Descriptive and Comparative Analysis

Twenty thoracic limbs of ten Lycalopex gymnocercus were dissected to describe origin and distribution of the nerves forming brachial plexuses. The brachial plexus resulted from the connections between the ventral branches of the last three cervical nerves (C6, C7, and C8) and first thoracic nerve (T1). These branches connected the suprascapular, subscapular, axillary, musculocutaneous, radial, median and ulnar nerves to the intrinsic musculature and connected the brachiocephalic, thoracodorsal, lateral thoracic, long thoracic, cranial pectoral and caudal pectoral nerves to the extrinsic musculature. The C7 ventral branches contribute most to the formation of the nerves (62.7%), followed by C8 (58.8%), T1 (40.0%) and C6 (24.6%). Of the 260 nerves dissected, 69.2% resulted from a combination of two or three branches, while only 30.8% originated from a single branch. The origin and innervation area of the pampas fox brachial plexus, in comparison with other domestic and wild species, were most similar to the domestic dog and wild canids from the neotropics. The results of this study can serve as a base for comparative morphofunctional analysis involving this species and development of nerve block techniques. Anat Rec, 300:537-548, 2017. © 2016 Wiley Periodicals, Inc.

MUSCULAR ANATOMY OF THE PECTORAL AND FORELIMB OF Caiman crocodilus crocodilus (LINNAEUS, 1758) (CROCODYLIA: ALLIGATORIDAE)

Abstract Among the Brazilian crocodilian, Caiman crocodilus crocodilus is widely distributed, given its adaptation to diverse habitats and their generalist diet. Information about the reproductive and ethological character of this species is abundant, whereas morphological data are still scarce. This study aimed to identify and report the muscles and their origin and the insertion into the pectoral and forelimb of C. crocodilus crocodilus. We used two male specimens, adults, belonging to the collection of the UFG - Jataí. We performed usual procedures for dissection and further individualization, withdrawal of members, and observation of muscle origins and insertions. The musculature of C. crocodilus crocodilus generally conservative is similar to C. latirostris and A. mississippiensis. The muscles of the pectoral girdle showed little variation among crocodilians. In the forelimb, the triceps muscle has five distinct heads and biceps has only one. The extensor and flexor surface of the hand showed similar topography to A. mississippiensis. We described some differences in the origin and insertion of certain muscles, as well as the classification and topography of some flexor and extensor muscles in the forearm segment. The distal segments showed more variations, which probably reflects the variety of locomotor habits among crocodilians.

Movement anatomy of the gluteal region and thigh of the giant anteater Myrmecophaga tridactyla (Myrmecophagidae: Pilosa)

Abstract: Locomotion reveals the displacement and behavior manner of the species in their daily needs. According to different needs of the several species, different locomotor patterns are adopted. The shapes and attachment points of muscles are important determinants of the movements performed and consequently, the locomotion and motion patterns of living beings. It was aimed to associate anatomical, kinesiology and biomechanics aspects of the gluteal region and thigh of the giant anteater to its moving characteristics and locomotor habits. It was used three specimens of Myrmecophaga tridactyla, settled in formaldehyde aqueous solution at 10% and subsequently, dissected using usual techniques in gross anatomy. The morphological characteristics of the gluteal region and thigh that influence the patterns of movement and locomotion of animals, were analyzed and discussed in light of literature. All muscles of the gluteal region and thigh of giant anteater show parallel arrangement of the muscular fibers, being flat or fusiform. These muscles are formed in the joint which the interpotent type biolever act. These morphological characteristics indicate a greater predominance of amplitude and movement speed at the expense of strength. On the other hand, features such as osteometric index and the observation of giant anteater motion indicate the opposite, what reflects this animal lack of expertise in locomotor habits and shows the need of future realization of more detailed studies in this subject.

Effects of the exposure to atrazine on bone development of Podocnemis expansa (Testudines, Podocnemididae)

The use of pesticides is a widely spread practice in Brazilian agriculture, and dispersion of these substances is an important factor for the fauna and flora. Atrazine is an endocrine disruptor in the xenoestrogen class that is used worldwide in agricultural practices. In Brazil, its use is permitted in several crops. Podocnemis expansa is a representative of the Testudines order that is the largest freshwater reptile of South America. Its distribution enables it to get in contact with molecules that are commonly used as pesticides, which may cause deleterious effects in target populations. In order to evaluate the possible effects of the exposure to atrazine on bone ontogeny of this species, eggs were artificially incubated in sand moistened with water contaminated with atrazine at concentrations equal to 0, 2, 20 or 200 μg/L. Embryos were collected throughout incubation and submitted to diaphanization of soft tissues with potassium hydroxide (KOH); bones were stained with Alizarin red S and cartilages by Alcian blue. Embryos were evaluated for the presence of abnormalities during the different stages of pre-natal development of skeletal elements. No effect of atrazine was observed on bone development during the embryonic phase in P. expansa individuals, in the conditions of this study.

Microscopic agglutination test on captive rattlesnakes : Data on serovars and titers

The microscopic agglutination test (MAT) is considered the “golden standard” leptospirosis serodiagnostic test, but there is little information about it as it pertains to snakes. To fill this information gap, we provide data on serovars and titers of fifty-six Crotalus durissus collilineatus sera samples that tested positive by MAT (10.1016/j.actatropica.2016.02.006 (Rodrigues et al., 2016) [5]). These data are presented in a table, along with a description of the methodology used for sample collection and serologic testing.

Concentrações bioquímicas séricas de jacaré-açú (Melanosuchus niger) machos, adultos de vida livre

Resumo: O jacaré-açu (Melanosuchus niger), pertencendo à família Aligatoridae, é considerado o maior predador aquático da América Continental. Como todos os répteis, possui particularidades para o uso de energia, controlando sua temperatura corporal nas variações climáticas. Essas variações podem revelar a situação metabólica atual desse animal, justificando o estudo de tais parâmetros. A importância desse trabalho se justifica pela escassez de estudos disponíveis na literatura. Nesse sentido, determinamos o perfil bioquímico de compostos sanguíneos de 12 jacarés açu, com peso de 77,66±8,92 kg, os quais foram: uréia (3,41±0,66), albumina (24,85±0,63), proteína total (63,83±16,97), ácido úrico (0,25±0,09), glicose (6,99±0,77), colesterol total (2,20±0,27), triglicérides (0,58±0,07), TGO (138,83±9,16) e TGP (12,47±2,82).

Clostridium difficile and Clostridium perfringens from wild carnivore species in Brazil

Despite some case reports, the importance of Clostridium perfringens and Clostridium difficile for wild carnivores remains unclear. Thus, the objective of this study was to identify C. perfringens and C. difficile strains in stool samples from wild carnivore species in Brazil. A total of 34 stool samples were collected and subjected to C. perfringens and C. difficile isolation. Suggestive colonies of C. perfringens were then analyzed for genes encoding the major C. perfringens toxins (alpha, beta, epsilon and iota) and the beta-2 toxin (cpb2), enterotoxin (cpe) and NetB (netb) genes. C. difficile strains were analyzed by multiplex-PCR for toxins A (tcdA) and B (tcdB) and a binary toxin gene (cdtB) and also submitted to a PCR ribotyping. Unthawed aliquots of samples positive for C. difficile isolation were subjected to the detection of A/B toxins by a cytotoxicity assay (CTA). C. perfringens was isolated from 26 samples (76.5%), all of which were genotyped as type A. The netb gene was not detected, whereas the cpb2 and cpe genes were found in nine and three C. perfringens strains, respectively. C. difficile was isolated from two (5.9%) samples. A non-toxigenic strain was recovered from a non-diarrheic maned wolf (Chrysocyon brachyurus). Conversely, a toxigenic strain was found in the sample of a diarrheic ocelot (Leopardus pardallis); an unthawed stool sample was also positive for A/B toxins by CTA, indicating a diagnosis of C. difficile-associated diarrhea in this animal. The present work suggests that wild carnivore species could carry C. difficile strains and that they could be susceptible to C. difficile infection.

Association of midazolam with ketamine in giant Amazon river turtles Podocnemis expansa breed in captivity

PURPOSE

Evaluate the effects of two anesthetic associations in giant Amazon river turtles (P. expansa).

METHODS

Twenty P. expansa, healthy, of both sexes, with weights between 1.0 and 1.5 kg of a commercial breeding facility located in the valley of the Araguaia River, Goiás, Brazil, were divided into two groups ( G1 n = 10 and G2 n = 10). Each group received a protocol being: P1 = midazolam (2 mg/kg IM) and ketamine (20 mg/kg IM) and P2 = midazolam (2 mg/kg IM) and ketamine (60 mg/kg IM), applied on G1 and G2, respectively. The drugs were applied in the left forelimb. The clinical parameters evaluated were: locomotion, muscle relaxation, response to pain stimuli in the right thoracic and pelvic members and heart rate. These assessments were made at time 0 (immediately after injection) and times of 5, 10, 20, 30, 45, 60, 90, 120, 150 and 180 minutes after the injections.

RESULTS

Group 2 showed a higher heart rate than G1 and more rapid and prolonged immobilization.

CONCLUSION

The sedation scores obtained by these protocols (P1 and P2) were satisfactory, with possible pharmacological contention for collecting biological samples and physical examination in P. expansa.

Association of acepromazine with propofol in giant Amazon turtles Podocnemis expansa reared in captivity

PURPOSE

To evaluate the effects of different concentrations of an anesthetic association in giant amazon turtles (Podocnemis expansa).

METHODS

Twenty healthy P. expansa of both sexes weighing between 1.0 and 1.5kg commercially bred in the Araguaia River Valley, Goias, Brazil, were separated into two groups (G1 n=10 and G2 n=10). Each group received a respective protocol: P1= acepromazine (0.5 mg/kg IM) and propofol (5 mg/kg IV) and P2 = acepromazine (0.5 mg/kg IM) and propofol (10 mg/kg IV). The acepromazine was administered in the left thoracic member and the propofol in the cervical vertebral sinus. Assessments were made of the anesthetic parameters of locomotion, muscle relaxation, response to pain stimuli in the right thoracic and pelvic members and heartbeat.

RESULTS

The anesthetic induction time was the same for both protocols (P1 and P2); however the P2 effects were of a longer duration.

CONCLUSION

The sedation achieved with both protocols (P1 and P2) were satisfactory for the biological sample collection, physical examinations and minor surgeries on this species.

Reproductive indices in natural nests of giant Amazon river turtles Podocnemis expansa (Schweigger, 1812) (Testudines, Podocnemididae) in the Environmental Protection Area Meanders of the Araguaia river

A count was made of unhatched eggs and hatchling live and dead Podocnemis expansa turtles in 327 natural nests located on the beaches of the Environmental Protection Area (EPA) Meanders of the Araguaia River, to determine the percentage of hatching (94.63%), non-hatching (5.37%), survival (94.24%) and hatchling mortality (5.76%), and the average percentage of dead hatchlings during the 15 days in the nursery (0.97%). The mean number of hatchlings per nest was determined from the sum of the number of live and dead hatchlings divided by the total number of nests, while the mean number of eggs per nest was determined from the sum of live and dead hatchlings and unhatched eggs divided by the number of nests. These calculations yielded the following mean values: live hatchlings (88.98 ± 23.94), dead hatchlings (0.37 ± 0.93), unhatched eggs (5.07 ± 9.57), and total number of eggs (94.42 ± 21.30). The reproductive efficiency of the wild population of P. expansa can be affected by many environmental factors such as temperature, humidity and rainfall. In addition, man-made factors like the presence of chemicals in the water and the potential for infectious disease also have significant impact. The reproductive indices data obtained from this study are indispensable for future investigations of hatching anomalies.