BIOL 111 Lecture Notes - Ecdysis, Endoskeleton, Honey Bee
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BIOL 111 Full Course Notes
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Most dominant group of animals (most diverse) Burgess shale: cambrian explosion anomalocaris: heard shelled species, development of eyes, mouth part, predatory appendages, armour, approx 1m in length. Sytiscus: predaceous diving beetles, adults collect air under wings and use this to breathe underwater. Honey bee: among most complex social life (eg. worker bees dance to communicate location of new food course) Reduced segmentation: body regions head, (cefalo)thorax, abdomen. Non living (can by penetrated by living tissue, like nerves), secreted by epidermis. Covers all external surface, digestive tract, tracheae. Physical protection: from abrasion, predation, parasite entry, desiccation. Location of pigments: camouflage, warning, color, mating, poison. Change morphology between larval and adult stages. Not as strong: limits size of organisms. Continuous growth in size in not possible: must be periodically shed (molted): mass grows continuously, but size changes in stepwise (upstairs) fashion = ecdysis. Respiration through skin not possible: spiracles (pores) and tracheae (tubes) Skeletons: hydrostatic skeletons: muscular filled with fluid (ex.