asked in 科學動物學 · 1 decade ago

有關海星的英文資料

最近學校要作英文的專題報告

我們決定要作有關於海星的

還有一些像海星的構造、覓食、習性、介紹...........等等

如果有資料

請直接貼上來

不要網頁

要全部都英文的喔

如果有中文翻譯就更好了......

那就拜託各位大大囉

小弟感激不盡

P.S.我們要用簡報作,所以資料要很詳細

1 Answer

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  • 1 decade ago
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    "Starfish" redirects here. For other uses, see Starfish (disambiguation).

    Sea stars, also known as starfish, are echinoderms belonging to the class Asteroidea. The names "sea star" and "starfish" are sometimes differentiated,with "starfish" used in a broader sense to include the closely related brittle stars, which make up the class Ophiuroidea, as well as excluding sea stars which do not have five arms, such as the sun stars and cushion stars.

    Sea stars exhibit a superficially radial symmetry. They typically have five "arms" which radiate from a central disk (pentaradial symmetry). However, the evolutionary ancestors of echinoderms are believed to have had bilateral symmetry. Sea stars do exhibit some superficial remnant of this body structure, evident in their larval pluteus forms.

    Sea stars do not rely on a jointed, movable skeleton for support and locomotion (although they are protected by their skeleton), but instead possess a hydraulic water vascular system that aids in locomotion.The water vascular system has many projections called tube feet on the ventral face of the sea star's arms which function in locomotion and aid with feeding. Sea stars usually hunt for shelled animals such as oysters and clams. They have two stomachs. One stomach is used for digestion, and the other stomach can be extended outward to engulf and digest prey. This feature allows the sea star to hunt prey that is much larger than its mouth would otherwise allow. Sea stars are able to regenerate lost arms. A new sea star may be regenerated from a single arm attached to a portion of the central disk.

    http://en.wikipedia.org/wiki/Sea_star

    裡面有更多詳細的資料

    2009-03-18 18:18:09 補充:

    翻譯

    海星是棘皮動物下的一個綱的動物的名稱。一般海星有五條「胳膊」,從身體中間伸出。海星的骨骼不能動,靠它的水管系統移動。在它胳膊上的水管系統上有很多凸出的小管足,用來吸水和抓食物。

    海星的嘴在身體下面。它的消化系統包括兩個胃,其中一個可以從身體裏面射出,在體外包住並且消化食物。

    2009-03-18 18:18:21 補充:

    有的海星靠著它的水管系統的韌性,可以打開貝殼,然後把胃插入貝殼裡直接消化殼裡的肉。海星這種外部消化的功能使它可以吃比它嘴大很多的動物,包括各種貝類,節肢動物和小魚。半消化的食物送入體內的另一個胃繼續消化吸收。因為海星需要很大的消化能力,它們的胳膊裏也有很多消化管。

    2009-03-18 18:18:25 補充:

    海星屬於能迅速再生的動物之一。如果一隻海星的一隻觸手被切斷的話,過一段短時間,海星便能長回觸手,而少數海星切下的觸手本身也會長成一隻海星,具有與蜥蜴、龍蝦、水螅綱生物、蝸牛和再生力最強大的渦蟲等生物的特點。

    Source(s): 謫仙+網路
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