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Introduction Basic Information Platyhelminthes Rotifera Nematoda Morphological Characteristics Nutrition Reproduction Nemertea Example Cool Facts Platyhelminthes Basic Information Platyhelminthes (Scientific name) Flatworms (Common name) Most are in marine, freshwater, and moist terrestrial habitats Few are parasitic Morphological Characteristics Bilateral symmetry Triploblastic Respire by Diffusion Invertebrate Acoelomate Incomplete Digestive system Excretory system Protonephridia Nutrition Free-living: -Carnivores -Scavengers Parasites: -Blood -Tissue fluids -Pieces of cells Reproduction Hermaphrodites Asexual Reproduction Example Class: Cestoda Parasite Live in digestive track of vertebrate Taenia saginata Beef tapeworm Cool Facts! Rotifera Basic Information Rotifera (Scientific name) Wheel Animal (Common name) Microscopic Animal Live in moist area Morphological Characteristics Multicellular Mostly soft body Cuticle Cement gland Not Segmented Complete Digestive System Cryptobiosis Pseudocelom Nutrition Primarily Omnivorous Filter food from water Eat dead or decomposing organic materials Reproduction Parthenogenesis Sexual Dimorphism Example Class: Bdelloidea Well-developed corona Evolutionary role of sexual reproduction Diversified into more than 300 species but are fairly similar to other sexually reproducing rotifera species Cool Facts! Nematoda Basic Information Nematoda (Scientific name) Roundworms (Common name) Most are parasitic Morphological Characteristics Unique Epidermis Invertebrate Muscles are all aligned longitudinally Little sensory apparatus Bilateral symmetry Pseudocoelom Lack of cilia Lack of respiratory system Cryptobiosis Nutrition Carnivorous Many terrestrial species feed on plant roots Some eat dead organic material Reproduction Example Class: Secernentea Parasitic Ascaris lumbricoides Giant roundworms Infect human Most common Cool Facts! Nemertea Basic Information Nemertea (Scientific name) Ribbon Worms (Common name) More complicated and well developed than the seemingly similar flatworms Most are marine Morphological Characteristics Lack of specialized gas exchange structures System of Blood Vessels Proboscis Rhynchocoel Acoelomate Complete digestive system Well-developed nervous system Highly flexible and contractible Nutrition Carnivorous Hunt Reproduction Gonochoristic Few terrestrial species are Hermaphroditic No Permanent Gonads Pilidium Larva Desor and Iwata larvae Most species can reproduce asexually by fragmentation, even multiple times Example Class: Anopla Lineus longissimus Longest Mucus contains a relatively strong neurotoxin Cool Facts!
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