ascidian

(redirected from Ascidians)
Also found in: Dictionary, Thesaurus, Medical.
Related to Ascidians: Urochordata, Bryozoans, Tunicates

ascidian:

see ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
..... Click the link for more information.
; tunicatetunicate
, marine animal of the phylum Chordata, which also includes the vertebrates. The adult form of most tunicates (also called urochordates) shows no resemblance to vertebrate animals, but such a resemblance is evident in the larva.
..... Click the link for more information.
.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
References in periodicals archive ?
ceratodes in the northern Chilean coast to spite to collect intertidal ascidians between Iquique and Antofagasta (Stations 129, 131, 133 and 159 sampled during Lund University Chile Expedition 1948-1949).
The ascidians described below were collected from the western slope of Four Ladies Bank (Quilty 1997), where sediment of gravelly sandy mud is thickly deposited (Harris et al.
Colonial ascidians as model organisms for the study of germ cells, fertility, whole body regeneration, vascular biology and aging.
and Haliclona sp., the coral Siderastrea stellata, and ascidian (Ascidiacea) collected at the states of Paraiba and Rio Grande do Norte, Northeastern Brazil.
(2011) A maternal factor unique to ascidians silences the germline via binding to P-TEFb and RNAP II regulation.
The ascidian has become the hot topic for research and development both at home and abroad for its numerous active agents with high activity.
Indole alkaloids from marine invertebrates have reported to be anti-inflammatory potentials; these include conicamin from tunicate [22], Lepadiformines A and B from ascidian [23] and aplysinopsintype compound from sponge Hyrtios erecta [24], manzamine from sponge [25], carteramine A from sponge [26], and ascidiathiazones A and B [27, 28] from ascidan.
Even longer sperm longevities of more than 24 h were reported in the ascidians Ascidia mentula [30].
(35) Besides bacteria and diatoms, other species like barnacles, serpulidae, ascidians, bryozoans, algae, and polychaetes are the frequent fouling organisms encountered on hard substrates in Mar del Plata harbor.
I used a PowerPoint presentation with photographs of algae, protozoa (single celled organisms - star forams are found on Lord Howe), sponges, cnidaria (sea jellies, sea anemones, coral, bryozoans), Molluscs (sea snails and sea slugs, clams, cuttlefish), Echinoderms (sea stars, sea urchins, brittle stars, feather stars, basket stars), Arthropods (hermit crabs, coral banded shrimp, anemone shrimp, painted crayfish), Chordates including those without backbones - Ascidians (yes there is such a thing), and those with back bones - Sharks and Rays, Fish, Turtles, Birds and Mammals (Lord Howe has Dolphins and gets the odd Whale shark or other whales passing by).