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Plurellidae
Plurellidae is a family of tunicates belonging to the order Phlebobranchia Phlebobranchia is a suborder of sea squirts in the class Ascidiacea. Characteristics The group includes both colonial and solitary animals. They are distinguished from other sea squirts by the presence of longitudinal vessels in the pharynge ..., and was first described by P. Kott in 1973. Genera: * '' Microgastra'' Kott, 1985 * '' Plurella'' Kott, 1973 References Tunicates {{tunicata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phlebobranchia
Phlebobranchia is a suborder of sea squirts in the class Ascidiacea. Characteristics The group includes both colonial and solitary animals. They are distinguished from other sea squirts by the presence of longitudinal vessels in the pharyngeal basket. This provides the etymology of their name: in ancient greek, means "blood vessel". Another characteristic of phlebobranchians is the gonads being surrounded by a loop of gut. The posterior part of the abdomen is absent, and many species also lack the epicardial cavity that surrounds the heart and other internal organs in many other sea squirts. Taxonomy * ?† Permosomidae ** ?†'' Permosoma tunicatum'' Jaekel 1915 'Sphaerospongia permotessellata'' Parona 1933* Agneziidae Monniot & Monniot 1991 gnesiidae Michaelsen 1898**'' Adagnesia'' Kott 1963 **'' Agnezia'' Monniot & Monniot 1991 'Agnesia'' Michaelsen 1898 non Koninck 1883**'' Caenagnesia'' Ärnbäck-Christie-Linde 1938 **'' Proagnesia depressa'' (Millar 1955) **'' Pter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunicates
A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata (). It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords (including vertebrates). The subphylum was at one time called Urochordata, and the term urochordates is still sometimes used for these animals. They are the only chordates that have lost their myomeric segmentation, with the possible exception of the 'seriation of the gill slits'. Some tunicates live as solitary individuals, but others replicate by budding and become colonies, each unit being known as a zooid. They are marine filter feeders with a water-filled, sac-like body structure and two tubular openings, known as siphons, through which they draw in and expel water. During their respiration and feeding, they take in water through the incurrent (or inhalant) siphon and expel the filtered water through the excurrent (or exhalant) siphon. Most adult tunicates are sessile, immobile and perman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
