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    August 19

    ANASPIDEA (海兔目/海鹿目)

    ANIMALIA (動物界)
       MOLLUSCA (軟體動物門)
          GASTROPODA (腹足綱)
             OPISTHOBRANCHIA (後鰓亞綱)
                ANASPIDEA (海兔目/無盾目)
     
    Anasppidea海兔目1
    Anasppidea海兔目2
    上圖: Akera soluta 顯示著脆弱的外殼(shell)、疣足翼(parapodia)及小頭盾(head)(白線顯示)
    下圖: 一隻典型的「海兔」, Aplysia dactylomela 展示著兩邊的疣足翼(簡稱足翼)及鼻通氣管(rhinophore簡稱鼻管)
     
    海兔目Anaspidea也稱為Aplysiomorpha,底下有著兩個科, Akeroidea Aplysioidea 各自成科。
    Akeroidea科底下有幾種Akera,他們屬於原始軟體動物類,有著輕薄鈣化的 氣泡殼及演變的細長的身體以方便在軟沉澱物中挖掘及隱藏。  頭部小,沒有觸鬚及鼻管。
    Aplysiomorpha科俗稱海兔,分為九屬: Aplysia, Bursatella, Dolabella, Dolabrifera, Notarchus, Petalifera, Phyllaplysia, Stylocheilus Syphonota 有些屬身長小於2cm,有些則可大於70cm 他們通常有一對捲起的鼻管,口器的兩邊各有大且扁平捲起的觸角。 有殼的話,已演化成一小塊鈣化的內骨板覆蓋著腮與心臟。 這個縮小的外套腔(mantle cavity)裹在一對足翼葉中。有些品種甚至演化出第二個外套腔。
    Akeroidea Aplysioidea 兩科有著兩個共同點,外套腔中有著蛋白石色的分泌腺(在地上分泌無色強味的液體)及紫色分泌腺在背頂(分泌紅或紫色液體) 第三個共同點在食管胃中的前腔有個大的角質板,後腔中有著許多的針刺。
    海兔目的成員皆是草食性,以特定的海草或藍綠藻(cyanobacteria 非藻類,亦稱藍綠菌)為生。
     
    原文網址: http://www.seaslugforum.net/factsheet.cfm?base=anaspidea

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