RCAAP Repository

An experiment was set-up to see in mortality inflicted by tadpole predators depends on prey and predator sizes. Fish and dragonfly larvae were used as predators and two size classes of Osteocephalus taurinus tadpoles as prey. Results show that the effect of predators is dependent on the size structure of the prey population. Furthermore, dragonfly larvae are more voracious predators than the fish used in the experiment. Both predators occur in natural ponds where Osteocephalus taurinus lays its eggs. The timing of arrival of predators and prey, which determines the relative sizes of predators and prey, is an important factor determining the outcome of an episode of community interaction in tropical ponds, as in similar temperate systems.

A contribution to the knowledge of the social organization of a population of Golden-rumped or Black-lion tamarin (L. chrysopygus) living in a stripe of natural vegetation in the State Park along the banks of the lower Paranapanema River, in the State of São Paulo, Brazil. Its composition and analysis based on captured groups, number of individuals and their distribuition in the area with concentrations; exchange of adults males, migration of individuals from groups and females home range establishment, indicate an organization which is likely to be matrilinear. The average number of individuals per group or expanded families, in the seven (7) captured groups was 3,57 specimens with a mean body weight in adults of 572,5 grams. In each group there is normally one reproducing couple with a double twin pregnancy in 2/3 (65 to 80%) of the occasions, and the twins are dizygotic. This tends to repetition in multiparous females.

A new species of synaptid holothurian, Leptosynapta brasiliensis n. sp., is described. The species shows affinities with Leptosynapta minuta (BECHER, 1906), presenting 12 simple tentacles and 12 dumb-bell shaped pieces constituting the calcareous ring; anchor ossicles exhibit a sharply bifurcate stock. All individuals were collected in Praia Vermelha, Rio de Janeiro - RJ, Brazil, in coarse sand, at a depth of some 3 m.

This paper was elaborated with intention of complementing original descriptions, updating the distribution ofthe species and providing the taxonomic basis necessary for a secure identification of the animals. We present detailed ilustrations of 6 species of Calanoid copepods and 3 species of Cyclopoids copepods found, but not necessarilly restricted to the Curuá - Una Reservoir located in the municipality of Santarém, state of Pará, Brazil.

No summary/description provided

A revision of the family Spelaeorhynchidae Oudemans, 1902 with descriptions of three new species from Brazil, Peru and Colombia.

Four zoeal stages and one megalopa stage of Hexapanopeus paulensis Rathbun, 1930 were obtained from eggs of ovigerous females from the northern coast of São Paulo State, Brazil. The experiments were performed in a climatically controlled room at 24 ±1 ºC at a salinity of 34.5%, and the animals were fed with newly hatched Artemia salina nauplii. All larval stages are illustrated and described in detail. The complete larval development consists of 4 zoeal stages and 1 megalopal stage. The main morphological characters that allow the identification of the zoeae and megalopa of H. paulensis are analyzed with respect to the other species of Xanthidae's family from southern and southeastern Brazilian coast.

Five species of Mysidacea are recorded: Metamysidopsis munda (Zimmer, 1918), Metamysidopsis neritica Bond-Buckup & Tavares, 1991, Mysidopsis tortonesei Bacescu, 1968, Promysis atlantica Tattersall, 1923 e Neomysis americana (Smith, 1873), all belonging to the family Mysidae. A key and illustrations of the principal morphological characters of the species are presented.

Oogenesis in Fannia pusio and Fannia heydenii was divided into a series of eight stages (stage I - germarium; stage VIII - mature egg), which are characterized and illustrated. Comments on similar researches and a comparison with related data in literature are also included.

Nudacotyle carollia sp. nov. (Trematoda, Nudacotylidae) is described on the basis of specimens from the intestinal tracts of three Colombian bats of the species Carollia perspicillata L. The new species resembles both of the genera of the family, Nudacotyle and Neocotyle, in the general position of the organs and in having a vertical cleft. It differs from Nudacotyle in the position of the ovary and cirrus sac and in the lenth of the ceca. The new species differs from Neocotyle in the shape of the body and the vitelline lobes and in the length of the ceca. The ventral cleft is considered to be an important generic character which can be used to unit all the species of both genera in the single genus, Nudacotyle.

Ananthidium gen.n. is described The type species, Anthidium inerme Friese, 1908, is redescribed with notes on its variations and Ananthidium dilmae sp.n., from Belo Horizonte, MG, Brazil, is described.

Four new species of Tropicanus DeLong are described: T. irroratus, T. mexicanus, T. chiapasus (from Mexico) and T. appendiculatus (from Brazil).

Females of Fannia pusio were submitted to three different diets (sugar, fish and sugar + liver), which influence in the oogenetic development was observed. The oogenesis was completed in the 15th. day, both under sugar or sugar + liver diets. This species proved to be autogenous for the first ovarian cycle.

Anatomical study of the alimentary canal and excretory system of the adult of Oncideres cervina are given and illustrated.

The effect of area size, number of collecting hours and months surveyed, on the estimation of relative richness of bees is analized. In order to characterize a biogeographical region, it is suggested to collect various samples of no less than 400 especimens for each one, in contrasting localities within a region, utilizing the usual standardized methodology for wild bees collecting. Thus, it is possible to have a better profit of the effort invested in the survey, making it possible to estimate the relative species richness among different biogeographical regions, in shorter periods of time.

General histology of small intestine (duodenum and jejunum) and the large intestine (colon and cloaca) of C. c. yacare (Daudin, 1802) Crocodilia-Reptilia. A comparative description is made of the histology of the small and large intestine of C. c. yacare. In all segments mucosa, submucosa, muscularis and serosa tunics were observed. The duodenum as very long villi, wich are well-developed and attached together to form irregular transverse ridges, covered with simple columnar epithelium with marginal and goblet cells. In the jejunum, the villi are shorter and less frequent. The colon as few folds, covered with the same epithelium; the lamina própria contains straight tubular glands with absortive cells, goblet and Paneth cells. The cloaca is very complex, with three well-defined regions: coprodeum, urodeum and proctodeum. In the coprodeum, the wall is folded, less muscular and the thin mucosa is covered by an epithelium with a few basal cells and mucosal cells. The urodeum as an additional external muscular tunic, with striated muscle fibers and a stritifield cylindrical epithelium with goblet cells. The proctodeum includes the free part of the penis in the male and, laterally, the ducts of a pair of holocrine cloacal glands. Near the opening of the ducts, the epithelium changes to a squamous keratinized type.

No summary/description provided

Narope cyllene Felder & Felder, 1859 is revalidated and redescribed. Descriptions of the immature stages and presented.

New data on the biology and morphology of Tunga penetrans (L., 1758) Jarocki, 1838 (Siphonaptera-Tungidae) are presented. In this paper is given a comparision between those points found at the literature with the new ones which have been pointed out, such as different aspects of the larval structural, a particular description of the egg-breaker, and morphobgical details of adults obtained by using scanning electron microscope. New data about evolution period are given.

Velez, I. & V.E. Thatcher: Five species of Lecithodendriidae (Trematoda) in bats from Colombia, including three new genera. Three new neotropical genera and species of Lecithodendriidae (Trematoda) are described from Colombian bats. Sturniratrema umbilicata gen. et sp. nov. from Sturnira lilium differs from other genera in having an oval ventral depression, a dorso-ventrally curved cirrus and a genital pore lateral to the acetabulum. Chiropterotrema antioquiense gen. et sp. nov. from Carollia perspicillata is distinguished by having the acetabulum within a triangular ventral pit as well as an separation between the the male and female genital pores. Topsiturvitrema verticalia gen. et sp. nov. from Carollia perspicillata has a different orientation of the body, being nearly spherical but somewhat flatened in an anterior-posterior direction. This genus also has a deep ventral cleft separating two ventral lobes which are filled with eggs. Castroia silvai Travassos, 1928, is also reported from Anoura caudifer and Peropteryx macrotis. The first of these represents a new host record for the species. Addiotionally, Limatulum gastroides Macy, 1935, is reported from Lonchophyla robusta wich is another new host record.