: a larval form of a digenetic trematode
What is the function of miracidium?
The miracidium also has a simple, protonephridial excretory system . Waste-containing body fluids are collected by two or three pairs of flame cells and excreted through two lateral excretory pores. During differentiation of the miracidium, germ cells grow and divide to form germ balls.
Which larva is produced by Radia?
During encystment the cystogenous cells secrete an abundant slimy material which hardens immediately and in a few minutes the animal is covered by a thick hard cyst and gets firmly attached to the aquatic plants. This encysted larva is called Metacercaria . It is in fact the juvenile fluke, also known as Marita (Fig.
What is sporocyst larva?
A larval form of digenetic trematode (fluke) that develops in the body of its molluscan intermediate host, usually a snail; the sporocyst forms a simple saclike structure with germinal cells that bud off internally and develop into other larval types that continue this process of larval multiplication (considered to be ...
What is Radia in zoology?
redia. (Science: zoology) A kind of larva, or nurse , which is produced within the sporocyst of certain trematodes by asexual generation. It in turn produces, in the same way, either another generation of rediae, or else cercariae within its own body.
What is trematode life cycle?
There are three distinct larval stages involved in all digenetic trematode life cycles: the miracidium, sporocyst, and cercaria . Some taxa also produce rediae and/or encysted metacercariae. All of these life stages except for the miracidium can be found in first intermediate hosts.
What is the life cycle of liver fluke?
Following ingestion, the young flukes migrate to the liver, through which they tunnel, causing considerable tissue damage. The infection is patent about 10-12 weeks after the metacercariae are ingested. The whole cycle takes 18-20 weeks .
What is larva called?
The larval forms of the various insects are called caterpillars, grubs, maggots , and nymphs.
What is Ephyra larva?
Ephyra larva is a kind of jellyfish . Complete answer: – Ephyra larva is an immature medusa stage. It comes into the world through metamorphosis of scyphistoma (which resembles a fixed polyp-like stage in the life of jellyfish). Its size is just a few millimetres.
What is another word for larva?
In this page you can discover 23 synonyms, antonyms, idiomatic expressions, and related words for larva, like: caterpillar , maggot, grub, invertebrate, worm, imago, pupa, larval, spore, cercaria and tadpole.
Is cercaria a larva?
A cercaria (plural cercariae) is the larval form of the parasite Trematode . It develops within the germinal cells of the sporocyst or redia. ... The motile cercaria finds and settles in a host where it will become either an adult, or a mesocercaria, or a metacercaria, according to species.
What is miracidium larva?
The miracidium is a ciliated, nonfeeding larva (Fig. 9.18). Under favorable conditions, it escapes from the eggshell, usually through the operculum, into the environment. The miracidium is elongated and covered with flattened, ciliated epidermal plates.
What is the difference between Cercariae and Metacercariae?
At this stage, the cercaria is released from the snail and seeks out a second intermediate host to infect. Metacercaria: ... It is in this stage that the parasite infects the definitive human host via ingestion of the snail or other second intermediate host.
What does Cercaria mean?
: a usually tadpole-shaped larval trematode worm that develops in a molluscan host from a redia.
What is the meaning of redia?
: a larval form of a digenetic trematode (such as a liver fluke) that is produced within a sporocyst , has a mouth, pharynx, and gut, and contains cells which give rise to other rediae or to cercariae — see also redial entry 3.
Is redia a word?
noun , plural re·di·ae [ree-dee-ee]. Zoology. a cylindrical larval stage of some trematodes, produced by a sporocyst and giving rise to daughter rediae or to cercariae.
