Ch 33 Cont - Ch 33 An Introduction to Invertebrates...

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Ch. 33 An Introduction to Invertebrates Annelids : Have bodies composed of a series of fused rings Annelids are coelomates The phylum Annelida is divided into two groups : Polychaeta (polychaetes) Oligochaeta (earthworms and their relatives, and leeches)
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Phylum Annelida Annelids : Have bodies composed of a series of fused rings Annelids are coelomates The phylum Annelida is divided into two groups : Polychaeta (polychaetes) Oligochaeta (earthworms and their relatives, and leeches)
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Figure 33.23 Parapodia Polychaeta (polychaetes)
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Oligochaete
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Epidermis Circular muscle Cuticle Longitudinal muscle Dorsal vessel Chaetae Intestine Nephrostome Fused nerve cords Ventral vessel Clitellum Esophagus Pharynx Crop Metanephridium Coelom Septum (partition between segments) Anus Skin Metanephridium Intestine Gizzard Ventral nerve cords with segmental ganglia Circulatory system vessels Subpharyngeal ganglion Mouth Cerebral ganglia Giant Australian earthworm Oligochaete
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Figure 33.25 Hirudo medicinalis
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Figure 33.UN04 Porifera Cnidaria Lophotrochozoa Ecdysozoa Deuterostomia Phlya : Nematoda and Arthropoda
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Phylum Nematoda Nematodes, or roundworms, are found in most aquatic habitats, in the soil, in moist tissues of plants, and in body fluids and tissues of animals They have an alimentary canal, but lack a circulatory system Reproduction in nematodes is usually sexual, by internal fertilization
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Figure 33.26 25 m
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Figure 33.27
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  • Spring '11
  • Cusic
  • Biology, Annelid, phylum Annelida

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