Cecilia Matzunaga, Giannina Passuni, José Pino, José Iannacone Oliver
Se describe el desarrollo embrionario de Helisoma peruvianum (Broderip, 1832) (Pulmonata:
Planorbidae) bajo condiciones de ambiente controlado. Se mantuvieron 1250 embriones localizados en 31 capsulas (promedio = 40,32) a 20 ± 1ºC y 24 h continuas de luz artificial. Se reconocieron 7 estadios embrionarios: 2 células, 4 células, mórula, blástula, gástrula, trocófora �veliger� y juvenil. La mayor mortalidad se produce a las 192 h post puesta en el estadio juvenil. Se obtuvieron diferencias significativas en el número de huevos por cápsula en comparación a H. trivolvis.
The embryonic development stages of Helisoma peruvianum (Broderip, 1832) (Pulmonata:
Planorbidae) reared under controlled conditions is described. 1 250 embryos located in 31 capsules (Mean = 40. 32) were maintained at 20 ± 1ºC, 24 h of continued artificial light. 7 embryonic stages were recognized: 2 cells, 4 cells, morulae, blastula, gastrula, trochophore "veliger" and juvenile. The greatest mortality occurs at 192 h after being placed on the juvenile. The number of eggs per capsule had a significant difference in comparison to H. trivolvis.
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