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| Koch,E.; Winik,B.C.; Castro-Vazquez,A.. |
| Development of Pomacea canaliculata from the gastrula stage until the first day after hatching is described. Trochophore embryos are developed after gastrulation, showing the prototroch as a crown of ciliated orange-brownish cells. However, no true veliger embryos are formed, since the prototroch does not fully develop into a velum. Afterward, the connection between the fore- and midgut is permeated and the midgut becomes full of the pink-reddish albumen, which is stored into a central archenteron's lake, from where it is accumulated into the large cells forming the midgut wall ("giant cells"). Electron microscopy of giant cells in late embryos showed that albumen is engulfed by large endocytic vesicles formed between the irregular microvilli at the top of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alimentary canal; Midgut gland; Symbiosis; Albumen. |
| Ano: 2009 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452009000100006 |
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| Gamarra-Luques,C. D.; Vega,I. A.; Koch,E.; Castro-Vazquez,A.. |
| A new species of cyclopoid copepod, Ozmana huarpium, is described as a symbiont to Pomacea canaliculata (Lamarck 1822) (Caenogastropoda, Ampullariidae). Rather large numbers (about one hundred copepods per snail) were found, although there was no evidence of harm to the host. To our knowledge, O. haemophila (symbiont to P. maculata), and the currently described species, O. huarpium, are the only copepod species ever recorded as endosymbionts to freshwater invertebrates. While O. haemophila is restricted to the haemocoel of its host, O. huarpium predominate in the penis sheath, the ctenidium and the mantle cavity, figuring in these pallial organs 63-65 % of total mature forms. The sex ratio of the symbiont is skewed to the female side in these organs,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ozmanidae; Ozmana haemophila; Ozmana huarpium. n. sp.; Pallial organs; Haemocoel. |
| Ano: 2004 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452004000200005 |
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