Resumo em Inglês:
The present study deals with the syncranial osteology of Liolaemus occipitalis Boulenger, 1885, a typical iguanid of the coastal region of Southern Brazil and Uruguay. Four specimens, collected in the State of Rio Grande do Sul, Brazil, were prepared by dissection, from which an osteological description is presented.Resumo em Inglês:
Three ariid fish, Netuma barba, Netuma planifrons and Genidens genidens, use the estuary of the Patos Lagoon (32ºS), Rio Grande do Sul, Brazil, as a nursery and feeding ground in various stages of their life history. A comparative study was made of the temporal and spatial distribution and relative abundance. Seasonal movements were interpreted on the basis of distribution and abundance of the young of these coexisting sea catfishe. Monthly otter trawl samples were made between November, 1979 and April, 1983. Temperature, salinities and dissolved oxygen contents were taken at each of the 674 sample stations. All three species were caught in ample temperature (12,1 to 26,3ºC), salinity (0,3 to 35,5‰) and dissolved oxygen (4,7 to 11,5 mg/l) ranges. However, they were more abundant in stations of low temperature and in salinity with highly dissolved oxygen content. N. barba was the most abundant catfish caught in the estuary, it constituted 81,9% in number and 81,4% in weight of ali ariid trawl catches during the study. N. barba occurred throughout the estuary, from the adjacent coastal region to the upper reaches of the Patos Lagoon estuary near the liminetic zone. N. planifrons occurred from adjacent coastal regions to low saline parts of the Patos Lagoon estuary, whereas G. genidens were distributed mainly in low saline and freshwater parts of the lagoon. Young-of-the-year N. barba aggregated near of the entrance of the lagoon in fall and winter, then moved up to intermediary parts of the estuary in spring, and they went to the upper part of the estuary in summer. Yearlings N. barba moved into the estuary in common with young-of-the-year but did not reach the coastal adjacent area. Young-of-the-year and yearling N. planifrons moved in to the estuary as the same pattern as N. barba but they became scarce during the late summer and early fall. G. genidens were scarcely captured in the estuary throughout the year. The spatial and temporal segregations among Netuma and Genidens were evident. A hypothetical model for the life history of N. barba is suggested.Resumo em Inglês:
The intermaxillary gland of Bufo paracnemis Lutz, 1925 is located at the pre-nasal area being divided anteriorly by the ascendent processes of the intermaxillary bone. The secretory tubules converge to form very ramified ducts which drain into a common opening in a fosseta underlying the vomer bone. The cells of the intermaxillary gland were be classified in four distinct types: Light-granule secretory; Dark-granule secretory; ciliated and basal cells. The light-granule secretory cells, are the main type of the secretory tubules, which are also found, in smaller numbers, in the excretory ducts. The dark-granule secretory cells appear in a low number, both in the secretory tubules and in the excretory ducts. Degranulated cells are frequently found in the excretory ducts and represent the degranulated phase of dark-granule secretory cells. The ciliated cells occur only in the excretory ducts. The basal cells occur in small number in the excretory ducts and secretory tubules. In the excretory ducts these cells are regarded as being mioepithelial cells. Although usually described in the literature as mucous, the secretory cells of the intermaxillary gland have serous characteristics. The intermaxillary gland is the first salivary gland to appear in the vertebrate evolution. Its duct system is uniformly lined by ciliated cells and scattered secretory cells. This indicates that in the evolution, of salivary glands, there was a diversification of the duct system, together with progressxve concentration of secretory cells in special áreas of this system.Resumo em Inglês:
In this paper the Cynolebias minimus species-complex is defined, together with a redescription of this species and a description of two new species. Informations on their ecology and reproductive behavior is also included. The interrelationships and distribution of the group is discussed.Resumo em Inglês:
Recent analytical and conceptual developments in multivariate statistics and morphometrics are reviewed. These developments include a modification of principal components analysis, the shear, and the truss networks, a geometric protocol for the generation of variables for statistical analyses. The implications of these techniques for studies of organismal evolution are discussed.Resumo em Inglês:
Leptinaria unilamellata is a species of veterinary importance, being cited here in Pernambuco for the first time. Accounts of both environment and reproduction are made. Ecological observations in a population of Dois Irmãos, Recife, Pernambuco, show predominance in relation to the sympatric snail: Bulimulus tenuissimus, Subulina octona and Sarasinula sp., and showed exceptional ability to adapt to environmental conditions. From August 1982 to November 1983 a total of 1.169 specimens were collected and classified into 8 class sizes. The average occurences in each month indicate that the population is in a state of reproductive equilibrium. Sexual maturity begins at a body length of 6.1 - 7.0 mm, when the specimens (still at half their final lenght) already manifest embryos in the uterus, numbering 1 to 8.Resumo em Inglês:
Vairimorpha necatrix was detected among laboratory cultured and field collected Spodoptera frugiperda larvae. Weak infections were not always fatal. In the case of fatal infections among diseased larvae, white patches were formed by agglomerations of adipose tissue beneath the transparent integument. The mid-gut of S. frugiperda larvae presented the first site of histological alterations caused by V. necatrix. The migration of the pathogen, probably occured in the form of agglomerations, from the epithelial cells to the body cavity. Adipose tissue appears to be the principal site for the pathogen development. The nerve ganglia, muscle fibres and epidermis also presented histological alterations due to the pathogen propagation.Resumo em Inglês:
In this paper the application of the resin poliester (Polylite 8001) for the inclusion of animals is described.Resumo em Inglês:
In this paper a new, small species of Telmatobius from the Department of Ancash, Peru, is described. Telmatobius carrillae sp. n. is compared to T. brevipes Vellard and T. marmoratus (Dumeril & Bibron), which are distinctly larger. Though morphologically similar to Batrachophrynus brachidactylus Peters, its chromosomic features indicate that it belongs in Telmatobius, T. carrillae could represent a connecting link between Batrachophrynus and Telmatobius.Resumo em Inglês:
Morphological and biological observations on populations of the land snail Bostryx conspersus, in three "Lomas"of the Central Coast of Peru, were carried out between 1979 and 1982. Three shell color varieties of B. conspersus are reponed herein, as well as its aestivation, activity and reproduction strategies. The possible interactions of B. conspersus with a dipteron (Scaptomyza sp.; Drosophilidae) and a nematode species are also discussed.Resumo em Inglês:
Calpodes ethlius (Cramer) is recorded for the first time a occurring in Galapagos.