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    Spirula - Wikipedia

    Spirula spirula is a species of deep-water squid-like cephalopod mollusk. It is the only extant member of the genus Spirula, the family Spirulidae, and the order Spirulida. Because of the shape of its internal shell, it is commonly known as the ram's horn squid or the little post horn squid. Because the live animal … See more

    S. spirula has a squid-like body between 35 mm and 45 mm long. It is a decapod, with eight arms and two longer tentacles, all with suckers. The … See more

    S. spirula is capable of emitting a green light from a photophore located at the tip of its mantle, between the ear-shaped fins. Evidently this … See more

    The order Spirulida also contains two extinct suborders: Groenlandibelina (including extinct families Groenlandibelidae See more

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    By day, Spirula lives in the deep oceans, reaching depths of 1,000 m. At night, it rises to 100–300 m. Its preferred temperature is around 10 °C, and it tends to live around … See more

    "Spirula Spirula". Tree of Life web project.
    "Spirulidae forum". TONMO.com. Archived from the original on 2006-03-16 – via Internet Archive (archive.org). See more

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  2. Spirulida - Wikipedia

  3. Spirulida - Wikipedia