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Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, commonly known as tapeworms.
Trematodes are covered by a tegument, that protects the organism from the environment by providing secretory and absorptive functions. The life cycle of a typical trematode begins with an egg . Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc .
Nematodes are very small, slender worms. Most are free-living, often less than 2.5 mm long and some only about 1 mm. Many nematodes are microscopic. Some soil nematodes can reach up to 7 mm in length, and some marine species can reach up to 5 cm. Some are parasitic and can reach lengths of 50 cm or more. [42]
There are 18,000 [1] to 24,000 [2] known species of trematodes, divided into two subclasses — the Aspidogastrea and the Digenea. Aspidogastrea is the smaller subclass, comprising 61 species. These flukes mainly infect bivalves and bony fishes. [3] Digenea — which comprise the majority of trematodes — are found in certain mollusks and ...
1–2 days [28] 15–30 days [29] Larval growth After hatching, the larvae develop into cysticercoid, which can survive for years in an animal [26] 5–7 weeks as cercariae in snails and longer periods in wet environments as encysted metacercariae [15] 10–14 days [27] 5–10 days (after maturing can survive for weeks outside the host) [28]
John Lawlor, the actor best known for his roles in The Facts of Life and Phyllis, has died. He was 83. The actor’s family announced the news in his obituary published on Monday, Feb. 24, nine ...
An online DOGE "live tracker" claimed on Tuesday that the department has saved taxpayers $37.69 billion since it began work on January 20 but did not provide evidence of how that figure was reached.
Mixing fruit into baked goods is nothing new. All sorts of recipes call for mashed banana or even applesauce. But there's something special about canned pineapple in the South, and we're not just ...