Search results
Results from the WOW.Com Content Network
Botryllus schlosseri is a colonial ascidian tunicate. It is commonly known as the star tunicate, [2] but it also has several other common names, including star ascidian and golden star tunicate. [3] [4] Colonies grow on slow-moving, submerged objects, plants, and animals in nearshore saltwater environments.
Ascidiacea, commonly known as the ascidians or sea squirts, is a paraphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. [2] Ascidians are characterized by a tough outer test or "tunic" made of the polysaccharide cellulose. Ascidians are found all over the world, usually in shallow water with salinities over ...
References A adhesive organ 1. An organ present at the anterior end of ascidian larvae, serving to attach the larva to the substrate during its metamorphosis. It is usually made of three papillae. 2. The individual papillae. atrium atrial pore atrial siphon Also excurrent siphon or exhalant siphon. Opening through which water exits the branchial basket in ascidians. B blastozooid Sexual ...
The star-shaped holes (Catellocaula vallata) in this Upper Ordovician bryozoan may represent a tunicate preserved by bioimmuration in the bryozoan skeleton. Undisputed fossils of tunicates are rare. The best known and earliest unequivocally identified species is Shankouclava shankouense from the Lower Cambrian Maotianshan Shale at Shankou ...
Botryllus schlosseri (star ascidian / golden star tunicate) Dendrodoa grossularia; Distomus variolosus; Polycarpa fibrosa ; Polycarpa gracilis; Polycarpa pomaria; Polycarpa scuba; Stolonica socialis; Styela clava (stalked sea squirt, club sea squirt, club tunicate, Asian tunicate, leathery sea squirt, rough sea squirt) Styela coriacea
Sycozoa pulchra, (common name - stalked ascidian) [2] is a sea squirt in the family Holozoidae, first described by William Abbott Herdman in 1886 as Colella pulchra. [ 1 ] [ 3 ] The taxonomic decision which determined the name, Sycozoa pulchra , and the species' synonymy was given by Patricia Kott in 1990.
Diagrammatic section of an Ascidia, representing the three sacs and the branchial sac as the pharynx or throat: (a) branchial orifice; (b) atrial orifice; (c) tunic or test (d) mantle; (e) branchial sac; (f) gullet; (g) stomach; (h) anal orifice; (i) dorsal lamina; the dotted line indicates the endostyle.
In modern representatives of ascidians, the contraction of the circular and longitudinal musculature causes the ascidian to squirt or shrink. Its presence in Megasiphon indicates that these behavioral traits typical of tunicates had already evolved approximately 500 million years ago.