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Tunicata    
被囊類; 被囊亞門

被囊類; 被囊亞門

Tunicata
n 1: tunicates [synonym: {Urochordata}, {subphylum Urochordata},
{Urochorda}, {subphylum Urochorda}, {Tunicata}, {subphylum
Tunicata}]

Tunicata \Tu`ni*ca"ta\, pr. n. pl. [NL. See {Tunicate}.] (Zool.)
A grand division of the animal kingdom, intermediate, in some
respects, between the invertebrates and vertebrates, and in
modern classifications considered a subphylum of the
vertebrates; called also urochordata. They were formerly
classed with acephalous mollusks. The body is usually covered
with a firm external tunic, consisting in part of cellulose,
and having two openings, one for the entrance and one for the
exit of water. The pharynx is usually dilated in the form of
a sac, pierced by several series of ciliated slits, and
serves as a gill.
[1913 Webster]

Note: Most of the species when mature are firmly attached to
foreign substances, but have free-swimming larvae which
are furnished with an elongated tail and somewhat
resemble a tadpole. In this state the larva has a
urochord and certain other structures resembling some
embryonic vertebrates. See {Ascidian}, {Doliolum},
{Salpa}, {Urochord}, and Illust. of {Social ascidian},
under {Social}.
[1913 Webster] Tunicate

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  • Tunicate - Wikipedia
    Tunicates are marine invertebrates belonging to the subphylum Tunicata ( ˌtjuːnɪˈkeɪtə TEW-nih-KAY-tə) This grouping is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords (including vertebrates)
  • Tunicate | Anatomy, Habitat Adaptations | Britannica
    Tunicates are distributed in ocean waters from the polar regions to the tropics Free-swimming tunicates are found throughout the oceans as plankton, while sessile forms grow mainly on solid surfaces such as wharf piles, ship hulls, rocks, and the shells of various sea creatures
  • Tunicate - Examples, Characteristics, Anatomy, and Pictures
    Tunicates are marine invertebrates of the subphylum Tunicata characterized by an outer exoskeleton made of tunicin (a type of cellulose) These animals possess dorsal nerve cords and notochords and are thus part of the phylum Chordata
  • Tunicates—Not So Spineless Invertebrates | Smithsonian Ocean
    Although tunicates are invertebrates (animals without backbones) found in the subphylum Tunicata (sometimes called Urochordata), they are part of the Phylum Chordata, which also includes animals with backbones, like us That makes us distant cousins
  • Whats a Tunicate? - UW Departments Web Server
    What's a Tunicate? Tunicates, commonly called sea squirts, are a group of marine animals that spend most of their lives attached to docks, rocks or the undersides of boats To most people they look like small, colored blobs
  • Tunicates: Current Biology - Cell Press
    Tunicates, also called urochordates, are an extremely diverse subphylum of the Chordata, a phylum that also contains the vertebrates and cephalochordates
  • Tunicates Explained - Features, Facts, and Examples
    Research shows tunicates serve as natural monitors of ocean health by concentrating heavy metals from seawater Scientists study them for medical research, as their compounds might lead to new medicines
  • Tunicate - New World Encyclopedia
    Tunicates (subphylum Urochordata or subphylum Tunicata) are marine, barrel-shaped invertebrates of the phylum Chordata They are commonly called tunicates because they are covered by a tough covering, or tunic, and also are called sea squirts, because they squirt out water when touched (Towle 1989)
  • Tunicates (Tunicata) | Red Sea Creatures
    A tunicate is a marine invertebrate animal belonging to the subphylum Tunicata These organisms are part of the Chordata, a phylum that includes animals with dorsal nerve cords and notochords, including vertebrates
  • Tunicates (Subphylum Tunicata) - iNaturalist
    A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata, which is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords The subphylum was at one time called Urochordata, and the term urochordates is still sometimes used for these animals





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