what is hypostome?

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A hypostome (also called the maxilla, radula, labium or Unterkiefer), is a calcified harpoon-like structure near the mouth area of certain parasiticarthropods including ticks and mites (Order Acari), that allows them to anchor themselves firmly in place on a host mammal while sucking blood. This mechanism is normally so strong that removal of a lodged tick requires two actions: One to remove the tick, and one to remove the remaining head section of the tick.

A partially complete, forked, conterminant hypostome of the trilobiteIsotelus (Ordovician of southern Ohio).

The apical portion of the polyps of hydrozoancnidarians like Hydra is referred to as a hypostome.

The term hypostome also refers to the ventral plate of trilobites and other arthropods...........

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