Transcript Myriapoda
Subphyla: MYRIAPODA CHARACTERISTICS “myriapod” means many footed Two segments- head and trunk Paired appendages on every trunk Respiration by tracheal tubes Excretion by Malpighian tubules Subphyla: MYRIAPODA EVOLUTION CLASSES Chilopoda Diplopoda Pauropoda Symphyla CLASS CHILOPODA Centipedes Flattened bodies Prefer moist places such as under logs, bark and stones Carnivores – eat earthworms, cockroaches and other insects Kill prey by use of their venom claws and chew with their mandibles CHILOPODA Scolopendra gigantea – largest centipede, about 30 cm in length Scutigera – household centipedes, 15 pairs of appendages, often found around bathrooms or damp cellars CHILOPODA Centipede bodies contain from a few to 177 segments Each segment (except the one behind the head and the last two) contains paired appendages The last pair of legs are longer that others and serves as a sensory function Each contain a pair of antennae, a pair of mandibles(lower jaw) and one or two pairs of maxillae (upper jaw). CLASS DIPLOPODA Millipedes Means “thousand feet” Not as active as centipedes, move slow, and don’t wiggle like centipedes do May roll into a coil when disturbed Prefer dark moist places under logs or stones Herbivorous- feeding on decayed plant matter and sometimes living plants DIPLOPODA Secrete toxic or repellant fluids to protect from predation More than 10,000 species of millipedes Exoskeleton – calcium carbonate DIPLOPODA 25-100 segments Thorax - 4 segments each containing one pair of legs Abdomen – contains 2 pairs of legs (leading to the impression of a thousand feet) Larval forms only have 1 pair of appendages per segment Contain a pair of antennae, mandibles and maxillae In most millipedes, the 7th segment is specialized as copulatory organs Females lay eggs CLASS PAUROPODA 500 species Small- 2mm or less Live in soil, leaf litter, or decaying vegetation Small head with antennae, and no true eyes However, have a pair of sense organs that resemble eyes 12 segments which bear 9 pairs of legs CLASS SYMPHYLA Small – 2-10mm Have centipede-like bodies Live in organic soil, leaf mold and debris Often pests on vegetables and flowers Soft bodied 14 segments, 12 of which bear legs Contain one pair of spinnerets (can produce silky thread) 160 species known