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Many annelids move by peristalsis (waves of contraction and expansion that sweep along the body), [8] or flex the body while using parapodia to crawl or swim. [39] In these animals the septa enable the circular and longitudinal muscles to change the shape of individual segments, by making each segment a separate fluid-filled "balloon". [ 8 ]
The peristomium is the first true body segment in an annelid worm's body in the anterior end. It is directly behind the prostomium and contains the mouth, tentacular cirri, and sometimes feeding palps, which may instead occur on the prostomium.
This list of prehistoric annelids is an attempt to create a comprehensive listing of all genera that have ever been included in Annelida which have been found ...
Pleistoannelida is a group of annelid worms that comprises the vast majority of the diversity in phylum Annelida.Discovered through phylogenetic analyses, it is the largest clade of annelids, comprised by the last common ancestor of the highly diverse sister groups Errantia and Sedentaria (Clitellata and related polychaetes) and all the descendants of that ancestor.
Microscope image of an individual elytron from Augenerilepidonotus dictyolepis.Note the fringing papillae on the border. In annelids, elytra (/-t r ə /; from Greek ἔλυτρον "sheath, cover"; sg.: elytron / ˈ ɛ l ə t r ɒ n /) [1] are shield-like scales that are attached dorsally, one pair on each of a number of alternating segments and entirely or partly cover the dorsum. [2]
The prostomium (From Ancient Greek, meaning "before the mouth"; pl.: prostomia; sometimes also called the "acron") is the cephalized first body segment in an annelid worm's body at the anterior end. It is in front of (but does not include) the mouth, being usually a small shelf- or lip-like extension over the dorsal side of the mouth.
Specimen of the annelid, Lepidonotus oculatus, with a microscope image of one of its parapodia (inset). Museums Victoria specimen.. In invertebrates, the term parapodium (Gr. para, beyond or beside + podia, feet; pl.: parapodia) refers to lateral outgrowths or protrusions from the body.
The annelids, collectively called Annelida, are a large phylum of animals, comprising the segmented worms, with about 15 000 modern species including the well-known earthworms and leeches The main article for this category is Annelid .