New Outlook on the System of Chitons (Mollusca: Polyplacophora)(<Special Number>the 2nd International Chiton Symposium)

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  • Sirenko Boris
    Zoological Institute of the Russian Academy of Sciences, Universitetskaya nab.1

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  • 多板類分類体系の新しい視点(<特集号>第2回国際ヒザラガイシンポジウム)
  • New outlook on the system of chitons (Mollusca: Polyplacophora)

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Abstract

In order to build a natural classification of the chitons, a new approach is proposed that uses not only the shells, as usual, but also other suitable features including aesthetes, girdle, radula, gills, glands, egg hull projections, spermatozoids etc. Several previous classifications are discussed. A brief review of the evolution of the Polyplacophora is given and a new classification of the chitons is proposed. The roles of the articulamentum and the reductions in the tegmentum in chitons are discussed. The evolutionary line of the reduction of slits is shown for the superfamily Cryptoplacoidea. Specifically, the genera Hemiarthrum, Weedingia and Choriplax, which have unslitted valves, have been removed from the order Lepidopleurida and reassigned to the order Chitonida within the Cryptoplacoidea. Affinities of these and other genera within the Cryptoplacoidea are discussed.

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