Peripatus.pptx

Connective link between Annelida and Arthropoda.

1. Peripatus Structure and Affinities K.Kamatchi Assistant Professor Department of Zoology Vivekananda College Tiruvedakam West

2. Arthropoda Class – Onychophora Living fossil Connective line between Annelida and Arthropoda Discontinous distribution Warmer parts – Africa – malya

3. Salient features Terrestrial Moist, shady, bark of dead trees Nocturnal Insectivorous Caterpillar 1.5-15cm Unsegmented Part – segmented Head, trunk

4. Antennae, eyes, oral papillae Mouth – jaws 14-43 legs – claws Anus Covered – soft – velvety skin Dermomuscular Haemocoel Straight – alimentary canal Slime gland – prey – captured Respiration – trachea – spiracles Excretion – metanephridia Heart – long tube Nervous system – ladder Fertilization – internal Development - direct

5. Affinities Guilding 1825 Place – Mollusca Mosely 1874 – Arthropoda Annelidan characters: Segments – homonomous Body – vermiform Dermomucular Legs – unsegmented Eye – simple Nephridia – segmentally Genital duct – ciliated Straight alimentary canal Arthropodan characters: Antennae – jointed Jaws Haemocoel Ostia – heart Tracheal system Chitinous cuticle claws Unique characters: Segments – not distinct Ladder – nervous Skin – soft Wrinkles Pair of jaws