| 释义 |
cercaria
cer·car·i·a C0208900 (sər-kâr′ē-ə)n. pl. cer·car·i·ae (-ē-ē′) or cer·car·i·as A larva of a trematode, which develops from a sporocyst or a redia.
[New Latin cercāria : Greek kerkos, tail + -āria, feminine of Latin -ārius, -ary.]
cer·car′i·al adj.cercaria (səˈkɛərɪə) n, pl -iae (-ɪˌiː) (Zoology) one of the larval forms of trematode worms. It has a short forked tail and resembles an immature adult[C19: New Latin, literally: tailed creature, from Greek kerkos tail] cerˈcarial adj cerˈcarian adj, ncer•car•i•a (sərˈkɛər i ə)
n., pl. -car•i•ae (-ˈkɛər iˌi) the free-swimming, tailed larva of parasitic trematodes. [1830–40; < New Latin < Greek kérkos tail] cer•car′i•al, adj. cer•car′i•an, adj., n. Thesaurus| Noun | 1. |  cercaria - tadpole-shaped parasitic larva of a trematode worm; tail disappears in adult stageclass Trematoda, Trematoda - parasitic flatworms (including flukes)larva - the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose |
Cercaria
cercaria[sər′kar·ē·ə] (invertebrate zoology) The larval generation which terminates development of a digenetic trematode in the intermediate host. Cercaria the larva of parasitic worms of the class Trematoda. The body, which measures 0.3–1 mm in length, has an oral and a ventral sucker. Cercariae have a furcately branched intestine, a nervous system, sometimes ocelli, cephalic glands, and well-developed protonephridia. Typical of cercariae is the development of a tail, which is sometimes bifurcate (in furcocercariae) or equipped with lateral appendages. The cercaria develops inside the preceding larval form, the sporocyst or redia, as a result of parthenogenesis. It leaves the body of the first intermediate host, a mollusk, and swims in water by means of its tail. It then penetrates the body of the second intermediate host, an invertebrate or frequently a fish, and becomes a metacercaria. The common liver fluke has no second intermediate host; the cercaria becomes encysted on coastal vegetation and is transformed into the next larval form, adolescarium. cercaria
cercaria [ser-kar´e-ah] (pl. cerca´riae) (L.) the final, free-swimming larval stage of a trematode parasite.cer·car·i·a, pl. cer·car·i·ae (ser-kā'rē-ă, -rē-ē), The free-swimming trematode larva that emerges from its host snail; it may penetrate the skin of a final host (as in Schistosoma of humans), encyst on vegetation (as in Fasciola), in or on fish (as in Clonorchis), or penetrate and encyst in various arthropod hosts. Body and tail are greatly varied in form, and specialized function is adapted to the particular life cycle demands of each species.
See also: sporocyst (1), redia. [G. kerkos, tail] cercaria (sər-kâr′ē-ə)n. pl. cercar·iae (-ē-ē′) or cercar·ias A larva of a trematode, which develops from a sporocyst or a redia.
cer·car′i·al adj.cer·car·i·a, pl. cercariae (sĕr-kar'ē-ă, -ē) The free-swimming trematode larva that emerges from its host snail; it may penetrate the skin of a final host, encyst on vegetation, or in or on fish, or penetrate and encyst in various arthropod hosts. Body and tail are greatly varied in form, and specialized functions are adapted to the particular life-cycle demands of each species.
See also: sporocyst (1) [G. kerkos, tail]cercaria The tailed, swimming larva of a trematode worm, such as a SCHISTOSOME.cercaria the last larval stage of the liver FLUKE. It lives in the freshwater snail Limnaea, produces a cyst round itself and develops into the adult fluke after ingestion by a sheep or another primary host.Cercaria (plural, cercariae)An intermediate-stage of the fluke larva, released into water by infected snails.Mentioned in: Fluke Infectionscercaria
Related to cercaria: Schistosoma, schistosomiasis, Metacercariae, rediaeWords related to cercarianoun tadpole-shaped parasitic larva of a trematode wormRelated Words- class Trematoda
- Trematoda
- larva
|