ABSTRACT. G rowth and reproduction of Bradybaena similaris (Férussac) (Moilusca, Xanthonychidae) in laboratory conditions. Biologica l aspects of Bradybaena similaris (Férussac, 182 1) were studied, such as: onset of sex ual maturity, occ urrence of self-fertilization, oviposi tion, incubation period, eclos ion rate and shell lengt h measurement at different stages of developme nt. It was noted that in isolated B. similaris the minimum and max imum ti me for reaching sexual maturity were 109 and 180 days, respectively. When kept in groups, the minimum time was 78 days. The occ urrence of self-fertili zation was observed in 18,4% ofspec imens. The total number of eggs per oviposition varied fro m one to 38 (average: 3,5 ± 7, 15), the total number of eggs per mollusc varied from one to 39 (average: 7,0 ± 10,21) and the total number of oviposition per moll usc vari ed form one to six (averege: 2,0 ± 1,27). Thirty oviposit ions (894 eggs) were fo ll owed and the minimum eclos ion time of the young was 14 days, the maximum eclosion time was 35 days and the average 23 ,69 days. The eclosion average percent was 8 1,22. As to the shelllength in different growth stages , it was observed that in B. sil1lila ris the length ofthe shell was similar unti l 30 days for age . After this period iso lated specimens acquired a greater growth rhythm when compared to that of grouped specimens. The maximum shell length of isolated spec imens was 17,4 mm whereas grouped spec imens reached 14,5 mm . In this specie, individ uais that were kept grouped became sex uall y mature earlier than isolated ones. Individ uais kept isolated reach larger length of shell. In the moment of the sex ual maturity, the Iength of the shell in the individuais tha were kept isolated was smaller than the grouped. KEY WORDS . Bradybaena similaris, biology, growth , reprod ucti on 8 radybaena similaris (F é

ABSTRACT. Biological developrnent of Angiostrongylus vasorum (Baillet) Karnensky (Nematoda, Metastrongylidae) in Subulina octona Bruguiere (Mollusca, Subulinidae) in laboratory conditions. With the purpose of investigating the biological aspects of Angiostrongy/us vasorum (Baillet, 1866) Kamensky, 1905 in Subu/ina octona Bruguiere, 1789 experimental infections were carried out with the exposure of 90 adult molluscs to 155 LI ofthe parasite/mollusc during 24 hours. The intramolluscan larval development was checked out daily through the chemical digestion offour infected molluscs and one molluscs from the control group dW'ing 21 days after infection. Until the 6 th day post-infection, only LI ofthe parasite has been observed.On the 7 th day; the presence of L2 was detected and from the 13 th day on, L3 of A.vasorum also appeared. By means of larval morphometry, it has been observed that, LI had na average size of335 x 14,5 um whereas L2 had an average size of440,7 x 33,9 um on the i h day ofter infection, reaching a, aximal diameter of 41,8 um on the 12 th day after infections. The L3 had an average size of 472,4 x 38,7 um on the 13 th day day and on the 21 st day after infection the measure was 551 ,3 x 27,6 um. ln order to verifY the infectivity ofL3 , from S. octona to the detinitive host, infection of a dog was undertaken by means of ingestion oftritured molluscs. On the 49 th day post-infection, L I was found in the feaces of the dog and at necropsy on the 84 th day post-infection adults worms were found in the lungs. KEY WORDS . Angiostrongy/us vasorUI11 , Subu/ina octona, intra-mollusc larvae evolutionEntre os helmintos que ocorrem no Brasil, observa-se Angiostrongylus vasorurn (Baillet, 1866) Kamensky, 1905, um nematóide que parasita artérias pulmonares e suas ramificações, ventrículo, átrio e aurícula direita de cães domésticos e carnívoros silvestres.

ABSTRACT. SIZE OI' Eli(;SA~1l~lEASlIRENlloNT

ABSTRACT. Growth and reproduction of Leptinaria IlIlilamellata (d'Orbigny) (Mollusca, Subulinidae) in laboratory conditions. Biological aspects of Leptinaria un/amellata (d ' Orbigny, 1835) were studied, such as : onset of sexual maturity, occurrence of self-fertilization and shell length measurement at different stages of development. In isolated specimens of L. uni/ameI/ata, sexual maturity was reached aI 74 days (minimum time) and 104 days (maximum lime). Forthe grouped specimens, the rninimum time was 71 days. The occurrence of self-fertilizalion was observed in both species, 100% of specimens. The 10lal number ofyoung per birth varied from one to 22 (average: 7,35 ± 5,78), lhe lotai number of offsprings per mollusc varied from IWO to eighl (average: 4.1 ± 1,41) and tOlal number of young per mollusc varied from five to 46 (average: 30.21 ± 8,08). As to lhe shelllength in different growth slages, il was observed lhat in L. uni/amellata, growth rhylhm was similar until 15 days for age . A f ter this period grouped specimens showed a high growth rhythm until 105 days after which the growth rhythm of grouped specimens beca me constant and the growth rhythm isolated specimens became greater. Grouped and isolated specimens reached a maximum size of 18,7 mm and 20,6 mm respectively. In lhe moment of the sexual maturity, lhe length ofthe shell in the individuais that were kept grouped was smaller than lhe isolaled ones for L. unilamel/ata. In this specie individuais thal were kepl isolated reach larger length of shell.

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