Chapter: Superphylum Ecdysozoa
Collection: Invertebrates
Unit 5. Biological Diversity
Book: Biology
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Nematodes are pseudocoelomate animals akin to flatworms, yet display more advanced neuronal development, a complete digestive system, and a body cavity. This phylum includes free-living as well as parasitic organisms like 'Caenorhabditis elegans' and 'Ascaris' spp., respectively. They include dioeceous as well as hermaphroditic species. Nematodes also possess an excretory system that is not quite well developed. Embryonic development is external and proceeds via three larval stages. A peculiar feature of nematodes is the secretion of a collagenous/chitinous cuticle outside the body. Arthropods represent the most successful phylum of animal on Earth, in terms of the number of species as well as the number of individuals. These animals are characterized by a segmented body as well as the presence of jointed appendages. In the basic body plan, a pair of appendages is present per body segment. Within the phylum, traditional classification is based on mouthparts, number of appendages, and modifications of appendages present. Arthropods bear a chitinous exoskeleton. Gills, trachea, and book lungs facilitate respiration. Sexual dimorphism is seen in this phylum, and embryonic development includes multiple larval stages.
00:00 Superphylum Ecdysozoa
01:02 Phylum nematoda
03:01 Morphology
04:45 Excretory system
05:13 Nervous system
05:54 Reproduction
07:18 Everyday connection
12:47 Phylum arthropoda
14:44 Morphology
17:24 Subphylum hexapoda
18:51 Subphylum myriapoda
20:32 Subphylum crustacea
23:27 Subphylum chelicerata
25:52 Section summary
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