Question

Which class of mollusca represents the primitive molluscs? What are their chief features?

Answer 1

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Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and in anatomical structure, but also in behaviour and in habitat. The phylum is typically divided into 8 or 9 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish and octopus, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods (snails and slugs) are by far the most numerous molluscs and account for 80% of the total classified species.

Answer 2

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❤. PRIMITIVE MOLLUSCS ❤

⭐. Class Aplacophora are primitive molluscs.

⭐. The animal are like worms.

⭐. They are marine.

⭐. Mantle, she foot and nephridia are absent.

⭐. Head is poorly developed.

⭐. Radula is present.

⭐. The cuticle has calcareous spicules.

⭐. Some animals have a ventral grove which can be compared to the foot of other molluscs.

⭐. Ex: Neomania , chaetoderma.