What is the meaning of miracidium?
: the free-swimming ciliated first larva of a digenetic trematode that seeks out and penetrates a suitable snail intermediate host in which it develops into a sporocyst.
What does a miracidium do?
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.
What is miracidium larvae?
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 does Cercaria mean?
Definition of cercaria : a usually tadpole-shaped larval trematode worm that develops in a molluscan host from a redia.
What is the life cycle of trematode?
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 sporocyst larva?
sporocyst in American English a. a saclike larval stage of many trematodes which produces rediae by asexual development from germinal cells. b. a protective cyst produced by some protozoans before sporulation, or a protozoan in such encystment.
What causes Fascioliasis?
Fascioliasis is a parasitic infection typically caused by Fasciola hepatica, which is also known as “the common liver fluke” or “the sheep liver fluke.” A related parasite, Fasciola gigantica, also can infect people.
How does miracidium swim?
Miracidium. Most Digenea with aquatic life cycles produce a miracidium that hatches from the egg and swims in search of a molluscan host. Locomotion is provided by numerous ciliated plates covering the body surface. Some miracidia, such as those of Stichorchis, already contain a well-developed sporocyst within.
How do you pronounce Cercaria?
noun, plural cer·car·i·ae [ser-kair-ee-ee]. Zoology. the disk-shaped larva of flukes of the class Trematoda, having a taillike appendage.
Where does Swimmer’s Itch come from?
What is swimmer’s itch? Swimmer’s itch, also called cercarial dermatitis, appears as a skin rash caused by an allergic reaction to certain microscopic parasites that infect some birds and mammals. These parasites are released from infected snails into fresh and salt water (such as lakes, ponds, and oceans).
What is Digenetic life cycle explain?
Any organism requires two hosts to complete its life cycle is called as a digenetic life cycle. The life cycle of Plasmodium requires two hosts ( human and mosquitoes) for completion.
What disease is caused by snails?
Schistosomiasis is considered one of the neglected tropical diseases (NTDs). The parasites that cause schistosomiasis live in certain types of freshwater snails. The infectious form of the parasite, known as cercariae, emerge from the snail into the water.
