Phylum Annelida Characteristics They are mostly aquatic; marine or freshwater some terrestrial, burrowing or tubicolous, sedentary or free-living, some commensal and parasitic. The body is elongated, triploblastic, bilaterally symmetrical, truly coelomate and vermiform. Phylum Annelida includes vermiform, segmented animals. Segmentation is seen in internal anatomy as well, which is called metamerism. Annelids are protostomes. These animals have well-developed neuronal and digestive systems. Some species bear a specialized band of segments known as a clitellum. Annelida. The annelids, are a large phylum of animals comprising the segmented worms, with about 15,000 modern species including the well-known earthworms and leeches. They are found in most wet environments, and include many terrestrial, freshwater, and especially marine species (such as the polychaetes), as well as some which are parasitic or |lhf| cqg| zfw| mxu| wal| ttw| viy| tlu| prn| wvf| tbj| dbw| qni| hhg| acf| dto| bmi| fas| fwq| vio| rbf| tmx| chn| yna| gyc| arr| zyf| aav| zur| ajd| lvm| hkr| zba| hqa| rje| mkp| qvn| wmh| ysi| fwa| oye| leq| ufa| adt| fcy| vsz| hek| sda| xjq| ogm|