The class Thaliacea contains about 70 species of small, barrel shaped animals that spend their lives swimming slowly through the warmer seas of the world. They swim as they feed, or visa versa, because — like all the Urochordates — they are filter feeders and they have their inhalant and exhalent siphons at opposite ends of their bodies. Like the Tunicates , they feed by drawing a current of water in through their inhalant siphon and out through the exhalent siphon. Between the two siphons, the water passes through the many pore or slats of the enlarged pharynx which occupies most of the body cavity. The water current is driven by beating cilia.
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Additional Information Encyclopedia of Life. Thaliacea Facebook. Kingdom Animalia animals. Animalia: information 1 Animalia: pictures Animalia: specimens Animalia: sounds Animalia: maps Eumetazoa metazoans. Eumetazoa: pictures Eumetazoa: specimens Eumetazoa: sounds Eumetazoa: maps Bilateria bilaterally symmetrical animals.
Bilateria: pictures Bilateria: specimens Bilateria: sounds Bilateria: maps Deuterostomia deuterostomes. Deuterostomia: pictures Deuterostomia: specimens Deuterostomia: sounds Phylum Chordata chordates. Chordata: information 1 Chordata: pictures Chordata: specimens Chordata: sounds Subphylum Urochordata sea squirts. Urochordata: pictures 31 Urochordata: specimens 1. Thaliacea: pictures 6. Order Doliolida. Doliolida: pictures 1. Order Pyrosomatida.
Pyrosomatida: pictures 1. Order Salpida. Salpida: pictures 4. Read more Connect with us Help us improve the site by taking our survey. Facebook Twitter Pinterest. Classification Kingdom Animalia animals Animalia: information 1 Animalia: pictures Animalia: specimens Animalia: sounds Animalia: maps The ADW Team gratefully acknowledges their support.
The Thaliacea comprise a class of marine animals within the subphylum Tunicata. Unlike their benthic relatives the ascidians , thaliaceans are free-floating pelagic for their entire lifespan. The group includes species with complex life cycles with both solitary and colonial forms. The three orders of thaliaceans are filter feeders.
Class Thaliacea: Strange World Of The Pyrosomes & Salps
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Van der Hoeven, Thaliacea are pelagic tunicates with a permanent and transparent test ; a tail is absent. They vary in size from very small about 1 mm to very large 20 m in case of the colonial pyrosomid forms. In contrast to the Class Ascidiacea , the Thaliacea have in common that they have the buccal and atrial siphons at opposite ends of the body. The musculature consists of loop-like bands in the body wall; rhythmic contractions of the muscles provokes a water circulation, which is not only used for gas exchange and feeding but serves also as a sort of propulsion. The life cycle comprises an alternation of generations. The sexually reproducing stages blastozooids are derived by budding from the individuals oozooids that develop from the egg.