Annelid, phylum name Annelida, also called segmented worm, any member of aphylum of invertebrate animalsthat are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they tak...
Increased intestinal muscle contractility and worm expulsion in nematode-infected mice. Am J Physiol. 1997;272:G321-G327. [PubMed] [Cited in This Article: 1] 191. Vallance BA, Galeazzi F, Collins SM, Snider DP. CD4 T cells and major histocompatibility complex class II expression influence...
Sponges and cnidarians are two of the animal phyla that lack bilateral symmetry. Sponges are considered the simplest animals with the lowest degree of cellular specialization. Cnidarians have two true tissue layers that form during embryonic development, whi...
Phylum Annelida - Annelids are worm-like organisms (leeches, earthworms, etc.). They are characterized by an elongated muscular body that is segmented. See phylum: Percolozoa Aschelminthes Plant PhylaLike animals, plants are divided into several phyla depending on given structural/morphological ...
Do earthworms have Protonephridia? The simpler, more primitive protonephridia, found in flatworms, ribbon worms, and rotifers, are usually scattered among the other body cells. More advanced, segmented invertebrates, such as earthworms, possess the more complex metanephridia, usually arranged in pa...
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