Webtrochophore a free-swimming, ciliated larva of many worms and some mollusks visceral mass the central section of a mollusk's body that contains the mollusk's organs mantle in biology, a layer of tissue that covers the body of many invertebrates mantle cavity the space between the mantle and body mass in mollusks and brachiopods ganglion WebJul 6, 2024 · Trochophore larva is the larva found in mollusca and annelids. What is the life cycle of a mollusk? Like many invertebrates, the mollusk life cycle includes one or more juvenile or larval stages that are very different from the adult form of the animal.
Early embryogenesis and organogenesis in the annelid
WebDec 5, 2003 · larvae referred to this larval type as ‘‘Love´n’s larva.’’ Huxley (1853, p 18–19) compared the ciliary bands of rotifers and annelid larvae and concluded that ‘‘the Rotifera are organized upon the plan of an Annelid larva’’; furthermore he proposed ‘‘that the Rotifera are the permanent forms of Echinoderm larvae.’’ WebMay 10, 2024 · Owenia fusiformis embryogenesis is similar to that of other equal spiral cleaving annelids, supporting that equal cleavage is associated with the formation of a coeloblastula, gastrulation via invagination, and a feeding trochophore-like larva in Annelida. The nervous system of the mitraria larva forms earlier and is more elaborated than ... thief spells dnd
Trochophore larva is found inA. Annelida and MolluscaB. Annelida …
WebTrochophore, alternatively referred to as trochosphere, are tiny, translucent, freely swimming marine larvae occurring in annelids and most of the mollusks. They have pear or spherical shapes and are girdled by ciliary rings, prototroch that helps in swimming. WebMay 10, 2024 · Annelid trochophore larvae have multiple and distinct ciliary structures, including an apical tuft, a prototroch, a neurotroch, a metatroch and/or a telotroch [68, 69]. Our study demonstrates that the first cilia to appear in O. fusiformis are those in the apical tuft and the prototroch, followed by the neurotroch, and lastly the metatroch (Fig ... Since annelids are soft-bodied, their fossils are rare. Polychaetes' fossil record consists mainly of the jaws that some species had and the mineralized tubes that some secreted. Some Ediacaran fossils such as Dickinsonia in some ways resemble polychaetes, but the similarities are too vague for these fossils to be classified with confidence. The small shelly fossil Cloudina, from 549 to 542 million years ago, has been classified by some authors as an annelid, but by others as a cnidarian (i.e. … thiefs scanning backpacks for credit cards