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Tunicata

tunicata

(Science: zoology) A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter. 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.

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.

Origin: NL. See Tunicate.


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tunicate-notochord or NO notochord

... then it would have been correct. With the Cephalochordata it is easy, all species of amphioxus retain their notochord in the adult stage. With Tunicata, the rule is like this: all of them have a notochord in their tail in the larval stage, but they loose the notochord upon metamorphosis, when ...

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by MrMistery
Wed Jun 25, 2008 8:15 am
 
Forum: Zoology Discussion
Topic: tunicate-notochord or NO notochord
Replies: 2
Views: 6396

WHAT IS THIS??

This image come from Mediterranean sea at the depth of about 20 metres. What is this in your opinion? Tunicata? Ctenofora? :?: http://www.fondali.it/images/forum/m3.jpg http://www.fondali.it/images/forum/m1.jpg :?: :?: :?: :?: :?: :?: :?: :?: ...

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by Prionace
Thu Sep 14, 2006 2:51 pm
 
Forum: Zoology Discussion
Topic: WHAT IS THIS??
Replies: 7
Views: 3475

Moluscus and Arthropods

... more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve. Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called Acephala, which was also included under Mollusca. See Molluscoudea. See ...

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by kandarp shah
Sun Jul 17, 2005 5:45 pm
 
Forum: Zoology Discussion
Topic: Moluscus and Arthropods
Replies: 6
Views: 12349

Moluscus and Arthropods

... more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve. Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called Acephala, which was also included under Mollusca. See Molluscoudea. See ...

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by mith
Sun Jul 17, 2005 2:10 pm
 
Forum: Zoology Discussion
Topic: Moluscus and Arthropods
Replies: 6
Views: 12349


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