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单词 procercoid
释义

procercoid

enUK

pro·cer·coid

P0576550 (prō-sûr′koid)n. A wormlike larval form of certain tapeworms, typically developing in a copepod.
[pro- + Greek kerkos, tail + -oid.]

procercoid

(prəʊˈsɜːkɔɪd) n (Zoology) the larval stage of certain tapeworms

Procercoid

enUK

procercoid

[prō′sər‚kȯid] (invertebrate zoology) The solid parasitic larva of certain eucestodes, such as pseudophyllideans, that develops in the body of the intermediate host.

Procercoid

 

one of the larval stages of certain tapeworms (including the broad fish tapeworm). A procercoid is approximately 0.05 mm long and is spindle-shaped. The posterior end is distinct from the rest of the body and is equipped with three pairs of chitinoid hooklets. The procercoid stage is usually passed in the body cavity of copepods, which serve as the first intermediate hosts of many tapeworms. After the second intermediate host—a fish—swallows the parasitized copepod, the procercoid is converted in the fish’s body into the next larval stage—the plerocercoid.

procercoid

enUK

procercoid

 [pro-ser´koid] a larval stage of fish tapeworms.

pro·cer·coid

(prō-ser'koyd), The first stage in the aquatic life cycle of certain tapeworms, such as the pseudophyllideans (family Diphyllobothriidae), following ingestion of the newly hatched larva (coracidium) by a copepod (water flea). The procercoid develops into a tailed larva in the body cavity of the crustacean first intermediate host; when the procercoid and its host are ingested by a fish, the procercoid enters the new host's tissues and becomes a plerocercoid.
See also: Diphyllobothrium latum, Pseudophyllidea. [pro- + G. kerkos, tail, + eidos, resemblance]

procercoid

(prō-sûr′koid)n. A wormlike larval form of certain tapeworms, typically developing in a copepod.
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更新时间：2025/1/9 17:27:58