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  2. Clitellata - Wikipedia

    en.wikipedia.org/wiki/Clitellata

    Earthworms and their kin, in the subclass Oligochaeta, lack eyes but have photoreceptor cells in the skin, especially in the dorsal portion of the anterior end. They also lack parapodia and appendages on the prostomium, the body and the periproct (terminal segment on which the anus is located).

  3. Earthworm - Wikipedia

    en.wikipedia.org/wiki/Earthworm

    The first body segment (segment number 1) features both the earthworm's mouth and, overhanging the mouth, a fleshy lobe called the prostomium, which seals the entrance when the worm is at rest, but is also used to feel and chemically sense the worm's surroundings. Some species of earthworm can even use the prehensile prostomium to grab and drag ...

  4. Annelid - Wikipedia

    en.wikipedia.org/wiki/Annelid

    Lamellibrachian tube worms have no gut and gain nutrients from chemoautotrophic bacteria living inside them. Feeding structures in the mouth region vary widely, and have little correlation with the animals' diets. Many polychaetes have a muscular pharynx that can be everted (turned inside out to extend it). In these animals the foremost few ...

  5. Oligochaeta - Wikipedia

    en.wikipedia.org/wiki/Oligochaeta

    Oligochaetes are well-segmented worms and most have a spacious body cavity (coelom) used as a hydroskeleton.They range in length from less than 0.5 mm (0.02 in) up to 2 to 3 metres (6.6 to 9.8 ft) in the 'giant' species such as the giant Gippsland earthworm (Megascolides australis) and the Mekong worm (Amynthas mekongianus).

  6. Papilla (worms) - Wikipedia

    en.wikipedia.org/wiki/Papilla_(worms)

    In polychaetes, these papillae are tiny, fleshy projections on the worm's body or parapodia, often associated with sensory and locomotive functions. [2] Some papillae have sensory receptors to help the worm detect environmental changes , such as touch, water currents , or chemical signals, and support movement by working with parapodia to aid ...

  7. Sucker (zoology) - Wikipedia

    en.wikipedia.org/wiki/Sucker_(zoology)

    In digeneal flukes there are usually an oral sucker at the mouth and a ventral sucker (or acetabulum) posterior to the mouth. Roundworms have their sucker just in front of the anus; hence it is often called a pre-anal sucker. Among chordates, some fishes and mammals have suckers, which are used as a holdfast to substrata.

  8. Polychaete - Wikipedia

    en.wikipedia.org/wiki/Polychaete

    Polychaeta (/ ˌ p ɒ l ɪ ˈ k iː t ə /) is a paraphyletic [1] class of generally marine annelid worms, commonly called bristle worms or polychaetes (/ ˈ p ɒ l ɪ ˌ k iː t s /). Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae , which are made of chitin .

  9. Gongylonema pulchrum - Wikipedia

    en.wikipedia.org/wiki/Gongylonema_pulchrum

    Gongylonema pulchrum was first named and presented with its own species by Molin in 1857. The first reported case was in 1850 by Dr. Joseph Leidy, when he identified a worm "obtained from the mouth of a child" from the Philadelphia Academy (however, an earlier case may have been treated in patient Elizabeth Livingstone in the seventeenth century [2]).