…The eight-segmented thorax and the location of the genital pores are characteristic of the Malacostraca, but the Stomatopoda are an isolated group with few characteristics that indicate a deep affinities with other classes. Most of them, such as the mantis shrimp Oratosquilla oratoria (illustration), commonly found in Japan, live in holes dug in the sandy mud bottom of shallow waters, but some, such as the giant clam Gonodactyla , live on coral reefs, and a few species are known from the deep sea. While the adult population has a very narrow range of movement, the planktonic larvae of this group appear in unexpected, distant oceans. … *Some of the terminology that mentions "Gonodactyla" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…胸部が8胸節からなることと,生殖孔の位置などは軟甲亜綱の一員である特徴を表しているが,口脚類は他の類との間に深い類縁関係を示すような特徴の少ない孤立した群である。 日本でふつうに見られるシャコOratosquilla oratoria(イラスト)のように多くは浅海の砂泥底に穴を掘ってすむが,フトユビシャコGonodactylaなどのようにサンゴ礁にすむものもあり,深海からも少数の種が知られている。成体の行動範囲はごく狭いのに対し,この類の浮遊期の幼生は思いがけない遠方の海に現れる。… ※「Gonodactyla」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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