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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 ...
The annelids (/ ˈ æ n ə l ɪ d z /), also known as the segmented worms, comprise a large phylum called Annelida (/ ə ˈ n ɛ l ɪ d ə /; from Latin anellus 'little ring'). [ 3 ] [ a ] The phylum contains over 22,000 extant species , including ragworms , earthworms , and leeches .
List of annelid families describes the taxa relationships in the phylum Annelida, which contains more than 17,000 extant species including ragworms, earthworms, ...
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.
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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 .
The Articulata hypothesis, simply stated, is the phylogenetic grouping of the phylum Annelida (which includes polychaetes, oligochaetes, and leeches) together with the phylum Arthropoda (arachnids, insects and crustaceans) into the common taxon Articulata. Cuvier grouped these diverse phyla together according to the common structural feature ...
These three genera have the following characters in common. The body is small and resembles polychaete larvae; the epidermis is ciliated; the number of segments varies from five and up, or can be completely absent; small prostomium with or without appendages; parapodia absent; septa reduced or absent; the nervous system consists of a brain and longitudinal ventral nerve cords closely connected ...