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To what extent are molluscs a group of specialised worms?
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Emma Jarvis To what extent are molluscs a group of specialised worms? The huge morphological diversity of molluscs makes it difficult to compare them, as a whole group, to any other group, phyla or even set of characteristics. Worms tend to be described as slender, elongated invertebrate animals, usually with soft moist bodies and inhabiting marine or freshwater, or burrowing in the soil. They can be parasites of humans or other animals, or any insect larva with an elongated body, for example a maggot or grub. Molluscs could have evolved almost anywhere out of the worm line. Many appear to have possible segmentation, and it was thought for a long time that their ancestors were annelids (they also share the same type of trochophore larva as annelids) and that they had lost their segmentation and coelomic body cavity in the evolutionary process. However, whilst some molluscs do have multiple pairs of the...
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