sexta-feira, 4 de outubro de 2013

EVOLUTION OF MOLLUSCA FROM "annelids". Attention for missing scales on the back of the Polynoide annelid in Figure, is not normal. Creepers polychaetes gave rise to animals that preceded the Mollusca, with ventral adhesive glands, that allowed an adherence to coastal rocks,where algae are fixed, It would be used as food by scraping, which would result in the emergence of the radula. The parapodia must be fused in an organ adhesive and locomotor, which served for the animal to explore the bedrock. Dorsal scales of Aphroditidae are connected to dorso-ventral muscle, in the same manner as dorsal plates of the Polyplacophora.

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