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The post-larval development of Loimia medusa Sav

, : The post-larval development of Loimia medusa Sav. Jour Marine Biol Assoc Unit Kingdom 15(1): 129-149

A terebellid, larva very common in plankton from the Plymouth district during spring, was reared and proved to be L. medusa. It is characterized by a very large gelatinous tube. Development of the external structures is described from a stage in which the 1st tentacle was just appearing to a juvenile stage in which the characters of the adult had arisen. Building of the 1st sandy tube on the bottom is described. Development of bristles and uncini are dealt with in detail and a comparison made with the corresponding development in Nicolea zostericola. Evidence of suppression of a pair of larval bristle-bundles in Loimia is indicated. Previous records of Loimia larvae are discussed. Mc-Intosh's separation of the British Loimia as a new species, L. montagui, is probably unjustified.


DOI: 10.1017/S0025315400055582

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