Phylum Nematoda Species: ~16,000 One of the most abundant animals on Earth – 5 Billion per Acre of Fertile Garden Soil Food: Organic Matter Many are Parasitic Tissue of Animals & Plants Rotting Substances Recycle nutrients in soils & bottom sediments
Phylum Nematoda Reproduction Sexual Sperm is amoeboid Dioecious – males and females separate Males smaller than females (dimorphic) 100s -1000s of eggs per day Lifestyles: Mostly parasitic Some free-living
Phylum Nematoda Digestive Tract Complete digestive tract Mouth surrounded by lips – that have sensory organs Mouth, teeth, jaws, buccal ‘mouth’ cavity, pharynx, intestines, rectum, anus
Phylum Nematoda Excretory System/Waste Removal 1 or 2 renette cells – glands absorb wastes from pseudocoelom and empties them outside through a excretory pore Osmoregulation of Nitrogen: – Ammonia & Urea
Phylum Nematoda Body: Size: microscopic – several meters Molt their cuticle Body wall has only longitudinal muscles Triploblastic Bilateral symmetry Unsegmented Pseudocoelomate
Phylum Nematoda Nervous System Anterior nerve ring Neuroendocrine secretions (hormones) – Growth, molting, cuticle formation, metamorphosis
Species:~2,000 Ciliated corona surrounding mouth Muscular pharynx (AKA Mastax) – Jaw-like function – Parthenogenesis is common Unfertilized egg develops into a new individual Freshwater or Marine Size: Very small! 0.1 - 0.5mm
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