RCAAP Repository

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.

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.

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.

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.

In this paper the application of the resin poliester (Polylite 8001) for the inclusion of animals is described.

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.

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.

Calpodes ethlius (Cramer) is recorded for the first time a occurring in Galapagos.

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In this paper, the relative growth of Macrobrachium acanthurus (Wiegmann, 1836) (Crustacea, Decapoda, Palaemonidae), is presented; the cephalothorax length/abdominal length, telson length/abdominal length and abdominal length/total length relashionships were determined. The adjusted equations showed a isometric growth pattern. There are no changes in these relationships during the animals growth that may be significant in the maximization of the meat's profit.

In this paper, the fecundity in Macrobrachium acanthurus (Wiegmann, 1836) of the Ribeira de Iguape river (Southern Brazil) (Crustacea, Decapoda, Palaemonidae), is presented. The mean individual fecundity of the population was estimated. Fecundity was related to either length and/or weight. Our data showed that this species presents high fecundity and is thus suitable for comercial culture. The fecundity/length and fecundity/weight relationships obtained are: F = - 14 712 + 2 311,8 L and F = -1493,9 + 798,76 W

Hammeriella gen. n. and, Hammeriellidae fam. n. (Acari, Oribatei) from South America are described. Hammeriella is also recorded from "Tierra del Fuego" (Chile) and from Argentina. The type species of Hammeriella, Pedrocortesia grandis Hammer, is fully redescribed and the cogeneric species, Pedrocortesia australis Hammer, is diagnosed in comparison with the type species, both being transferred to Hammeriella. The redescriptions were made from syntypes deposited in the Zoologisk Museum of Copenhagen, sent on loan for this study.

A new genus Andesperuviella (Acari, Oribatei, Hammeriellidae) is described. The type species, Pedrocortesia dentata Hammer, 1961 is redescribed in detail. The genus, up to the present, is monotypic and restricted to the Peruvian Andes.

A new genus Novazelandiella (Acari, Oribatei, Hammeriellidae) is described. The type species, Pedrocortesella nigroclava Hammer, 1966, New Zealand, is redescribed from the holotype (Zoologisk Museum, Denmark) and from six specimens (Acarology Laboratory, USA) identified as being co-specific with the type material, after being confronted with it. Up to the present time, the new genus is monotypic and restricted to New Zealand, being close to the South American genus Hammeriella Paschoal.

In order to verify the existence of seasonal variations in morphology of Bosmina longirostris and Bosmina hagmanni, samples were taken from Paranoá Lake (Brasília, DF) during 1983. Body length and breadth, antennule, mucro and eye diameter were measured. Alometry rates were also calculated. It was verified that throughout the year both Bosmina species presented variation involving the five measures. The measures, except the antennule and mucro of B. longirostris, depend, at least partially, on the size of the individual and, therefore, on the age structure of the population. The antennule and mucro variations of B. hagmanni were strongly related to alometry rates. For B. longirostris the antennule and mucro variations appeared to be related to phenomena in an embryonic phase.