A Review of Molluscan Cytogenetic Information based on the CISMOCH : Computerized Index System for Molluscan Chromosomes : Bivalvia, Polyplacophora and Cephalopoda

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  • 軟体動物細胞遺伝学的研究総覧 : コンピュータを利用した軟体動物染色体の検索システム CISMOCH を利用して : 二枚貝綱・多板綱・頭足綱
  • 軟体動物細胞遺伝学的研究総覧-コンピュータを利用した軟体動物染色体の検索システムCISMOCHを利用して--2枚貝綱・多板綱・頭足綱〔英文〕
  • ナンタイ ドウブツ サイボウ イデンガクテキ ケンキュウ ソウラン コンピュー

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Abstract

Cytogenetic studies (up to 1984) of the three molluscan classes, Bivalvia, Polyplacophora and Cephalopoda have been compiled using the CISMOCH-Computerized Index System for Molluscan Chromosomes-and reviewed concerning on the basis of karyological characters, i.e. chromosome number, fundamental number and chromosome size. Diploid chromosome numbers (2N) of 125 bivalve species from 22 families range from 14 to 48. Fundamental numbers (FN) for 55 species have been calculated and range from 20 to 76. More than half of the diploid chromosome complements in bivalves are meta- or submetacentrics except in some Mytilidae, Pectinidae and Terenidae. Total diploid chromosome length has been reported mostly from the Mytilidae, and shows an increase as 2N increases. Karyotype variety is very apparent in the Mytilidae and Pectinidae ; while stability is more typical of the Ostreidae and the Unionoida. Diploid chromosome numbers range from 12 to 26 among the 14 species Polyplacophora studied. FN has been calculated for six of these. Chromosome of some types are mostly meta- or submetacentric and 2N=24 appears frequently in this class. Nevertheless, the Acanthochitonidae have a variety of chromosome numbers, i.e. 2N=16, 18 and 24, and several telo- or subtelocentrics appear in their karyotypes. Chromosomes of only three Cephalopoda species investigated have high diploid numbers, 2N=52 and 56. There is no published information on the chromosomal morphology of this highly specialized group.

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