EEB266H1 Lecture Notes - Lecture 8: Malpighian Tubule System, Panarthropoda, Cephalothorax
28 Apr 2016
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Hemocoel as hydrostatic skeleton, coelom reduced only seen around gonads, heart is lost, mouth with 2 stylets for piercing, cuticle complex, cryptbiotic (diapause) 1-15cm long, moist habitat, restricted to southern land masses, nocturnal. Caterpillar-like but are adults, head bearing 3 appendages: Sensory antennae, oral papillae (slime glands) and mandibles, including prominent antennae; tracheal respiration; thin highly permeable cuticle (l & g); covered with scaly papillae and sensory bristles gives a velvety, iridescent appearance. Terrestrial are constrained in size: don"t have supportive medium during molting. Paired jointed appendanges on each segments; sclerotized cuticle (exoskeleton: impermeable to g&l): reduced coelom. Sclerotized cuticle with quinone tanned proteins (covalently linked proteins). Mineral incorporation. molting usually results in death: unable to move. Cryptobiosis: able to slow down or stop metabolism to wait for favourable environment. First three sets of paws, claws are directed forward, last are directed posteriorly (escape behavior) No maternal care. spiracles convey air directly to tissues for gas exchange.
