Now, if we were to concede that the ascidians were the common ancestors [61] of both these sharks and of the higher mammals, we should be little, if any, nearer to an explanation of the phenomenon by means of "Natural ❋ St. George Mivart (N/A)
The species composition of the benthic community changed from a crab-dominated assemblage to a more diverse mix of starfish, ascidians, and sponges. ❋ Unknown (2009)
Fisheries in several of the Australian colonies, and who is qualified to speak on these matters, the destruction of the oyster there has been brought about by sedimentary deposits, by parasitic growths, such as sponges, mussels, ascidians, and sea-weed; by the attacks of the dog-whelk and other natural enemies; and by their continual removal by human agency. ❋ Unknown (2004)
In others again, as the ascidians, nothing of the sort is visible. ❋ Unknown (2002)
Some testaceans there are, that are entirely enveloped in shell and expose no portion of their flesh outside, as the tethya or ascidians. ❋ Unknown (2002)
Further, the substance of some of these intermediate creatures is fleshlike, as is the case with the so-called tethya (or ascidians) and the acalephae (or sea-anemones); but the sponge is in every respect like a vegetable. ❋ Unknown (2002)
There indeed it might well be supposed to end, but, marvellous as it seems, it reappears in very lowly creatures; namely, in certain of the ascidians, sometimes called tunicaries or sea-squirts. ❋ St. George Mivart (N/A)
We were just in ecstasies over differentiations, and molecules, and the professor, and protoplasms, and ascidians. ❋ Various (N/A)
BARRIER REEF OF AUSTRALIA and formerly Commissioner of Fisheries in several of the Australian colonies, and who is qualified to speak on these matters, the destruction of the oyster there has been brought about by sedimentary deposits, by parasitic growths, such as sponges, mussels, ascidians, and sea-weed; by the attacks of the dog-whelk and other natural enemies; and by their continual removal by human agency. ❋ Philip E. Muskett (N/A)
Included in the catch were a large number of monstrous gelatinous ascidians or "sea-squirts." ❋ Douglas Mawson (1920)
A haul was made in two hundred and fifty fathoms of ascidians, sponges, crinoids, holothurians, fish and other forms of life in such quantity that Hunter and Hamilton were occupied in sorting the specimens until five o'clock next morning. ❋ Douglas Mawson (1920)
Urochorda = the ascidians, or sea-squirts, certain forms of life only recently recognised as relatives of the vertebrata. ❋ Unknown (1906)
There are also a variety of remotely allied marine organisms known as tunicates, sea-squirts, or ascidians (Fig. 2). ❋ Various (1880)
In the oyster and ascidians no organs can be detected in the male, but in the female they are developed. ❋ Ray Vaughn Pierce (1877)
Lamarck's acuteness is also shown in the fact that, whereas Cuvier placed them among the acephalous molluscs, he did not regard the ascidians as molluscs at all, but places them in a class by themselves under the name of _Tunicata_, following the Sipunculus worms. ❋ Unknown (1872)
In Paris, about the time of Lamarck's death, flourished also Savigny, who published his immortal works on the morphology of arthropods and of ascidians; and Straus-Durckheim, whose splendidly illustrated volumes on the anatomy of the cockchafer and of the cat will never cease to be of value; and É. ❋ Unknown (1872)
Thus, beginning with the larvae of ascidians (a marine mollusc,) we get by development to fish lowly organized (as the lancelet), thence to ganoids and other fish, then to amphibians. ❋ Ebenezer Cobham Brewer (1853)
I mean, Wells is supposed to be a developmental biologist - he must know about, to name one example, the work of EG Conklin on ascidians around 1900, in which he mapped out the distribution of cytoplasmic determinants in the egg. ❋ Unknown (2009)
This is also not a new revelation; I already mentioned the work of Conklin on ascidians, so we've known for over a century that many animals are mosaic, getting a headstart on spatial differentiation with a specific distribution of some informational molecules. ❋ Unknown (2009)
