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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 ...
A tunicate is an exclusively marine invertebrate animal, a member of the subphylum Tunicata (/ ˌ tj uː n ɪ ˈ k eɪ t ə / 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).
A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomal bilaterian animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / kor-DAY-tə).All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.
The calcichordate hypothesis, formulated by British Museum paleontologist Richard Jefferies, holds that each separate lineage of chordate (Cephalochordates, Urochordates, Craniates) evolved from its own lineage of mitrate, and thus the echinoderms and the chordates are sister groups, with the hemichordates as an out-group. [1]
Thaliacea is a class of marine chordates within the subphylum Tunicata, comprising the salps, pyrosomes and doliolids.Unlike their benthic relatives the ascidians, from which they are believed to have emerged, thaliaceans are free-floating for their entire lifespan.
Pegea confederata on a 1995 stamp from Azerbaijan. A salp (pl.: salps, also known colloquially as “sea grape”) or salpa (pl.: salpae or salpas [2]) is a barrel-shaped, planktonic tunicate in the family Salpidae.
Clavelina picta have variable cool colours. The rims of the siphons are reddish to dark purple. Their bodies are translucent. [2]Clavelina picta are invertebrate filter feeders that feed by inducing a current into the branchial cavity from the incurrent siphon, with the help of the endostyle using cilia. [3]