ascidian

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Related to Ascidiacea: Larvacea, Thaliacea

ascidian

any PROTOCHORDATE of the class Ascidiacea (subphyllum Tunicata), such as the sea squirt, the adults of which are degenerate and sedentary. See also APPENDICULARIA.
References in periodicals archive ?
Location(s) Solitary or Taxon collected Colonial Phylum Chordata Subphylum Tunicata Class Ascidiacea Order Aplousobranchia Family Didemnidae Didemnum psammathodes b Colonial Didemnum duplicatum b, c Colonial Diplosoma listerianum b Colonial Lissoclinum fragile a, b Colonial Family Polyclinidae Polyclinum constellatum b, e Colonial Family Clavelinidae Clavelina oblonga d Colonial Order Phlebobranchia Family Perophoridae Perophora sp.
PSOLIDAE Psolus squamatus CHORDATA, ASCIDIACEA PYURIDAE Pyura haustor Pyura miranilis
Some species identified as causing similarity within fishing grounds such as Alcyonium digitatum, hydroids, Ascidiacea, and Diodora graeca are known to be associated or occur as epibionts on queen scallops in the Isle of Man (Bradshaw et al.
The epifauna was composed of 46 Scaphopoda and mollusca species, 36 Fish, 33 Polychaeta, 29 Crustacea, 6 Echinodermata, 2 Cnidaria (Anthozoa), 3 Sipuncula, 1 Nemertini, 2 Ascidiacea and 1 Pycnogonida.
0,2 0,4 ECHINODERMATA Holothuroidea Athyonidium chilensis (Semper, 1868) (1) 0,4 0,5 Echinoidea Tetrapygus niger (Molina, 1782) (1) 0,4 1,0 Loxechinus albus (Molina, 1782) (1) 0,3 0,7 Asteroidea Heliasther helianthus (Lamarck, 1816) (1) 0,1 0,3 Meyenaster gelatinosus (Meyen, 1834) (1) Stichaster striatus Muller & Troschel, 1840 (1) 0,2 0,4 UROCHORDATA Ascidiacea Pyura chilensis Molina, 1782 1,0 1,5 Ascidiacea indet.