from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See sea squirt.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any member of the class Ascidiacea (the sea squirts)
from the GNU version of the Collaborative International Dictionary of English
- n. One of the Ascidioidea, or in a more general sense, one of the Tunicata. Also as an adj.
from The Century Dictionary and Cyclopedia
- Of or belonging to the Ascidia or Tunicata.
- n. One of the Ascidia or Tunicata; a sea-squirt.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves
It is an interesting fact that vanadium is an essential element to [[ascidian]] s, also known as sea squirts.
Kenjo A, et al., Cloning and characterization of novel ficolins from the solitary ascidian, Halocynthia roretzi.
A new transglutaminase-like from the ascidian Ciona intestinalis.
On the left is a urochordate, an ascidian, a sessile, filter-feeding blob that is anchored to rocks or pilings and sucks in sea water to extract microorganismal meals.
The colour of the ascidian is in some cases sallow, and in other cases red.
As a general rule, then, all testaceans grow by spontaneous generation in mud, differing from one another according to the differences of the material; oysters growing in slime, and cockles and the other testaceans above mentioned on sandy bottoms; and in the hollows of the rocks the ascidian and the barnacle, and common sorts, such as the limpet and the nerites.
The so-called tethyum or ascidian has of all these animals the most remarkable characteristics.
With regard to testaceans, of the walking or creeping species the urchin appears to have the least developed sense of smell; and, of the stationary species, the ascidian and the barnacle.
If the animal be opened, it is found to have, in the first place, a tendinous membrane running round inside the shell-like substance, and within this membrane is the flesh-like substance of the ascidian, not resembling that in other molluscs; but this flesh, to which I now allude, is the same in all ascidia.
In the transition that once took place from one species of ascidian larva to a form similar to the lancelet fish, he sees the new branch diverging in the series of vertebrates.