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Chaetae on the notopodium are called notochaetae and those on the neuropodium are called neurochaetae. Thick, internal chaetae that provide support for well-developed notopodia or parapodia are called acicula. A wide range of chaetal shapes and arrangements exists: [6] [1] [4] [5] Basic forms are capillaries and spines. Capillaries are the most ...
In most species the edge of the mantle also bears movable bristles, often called chaetae or setae, that may help defend the animals and may act as sensors. In some brachiopods groups of chaetae help to channel the flow of water into and out of the mantle cavity.
There are four bundles of one to twenty-five chaetae on each segment; these have muscles attached to their bases and can be extended or retracted. [2] Leeches, order Hirudinida, [4] mostly have flattened bodies, usually tapered at both ends. They have a fixed number of segments, 33, but the segmentation is not visible externally because the ...
Depending partly on their form and function, setae may be called hairs, macrotrichia, chaetae, or scales. The setal membrane is not cuticularized and movement is possible. Some insects, such as Eriogaster lanestris larvae, use setae as a defense mechanism, as they can cause dermatitis when they come into contact with skin. [5]
The worm has 21 segments and 16 of them bear chaetae (the bristled setae of polychaetes). The face is somewhat flattened. The body is cylindrical, but tapers slightly toward the posterior end. In life, the worm is transparent, with ring-shaped integument (scaly ridges) along the back, and discontinuous brown stripe markings.
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