BIOL 2030 Lecture Notes - Lecture 12: Osmosis, Stellate Cell, Spiracle
26 Feb 2017
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Introduction: body form and function, exoskeleton, body movement, gas exchange, endocrine system, excretion, introduction. At least 75% of all animal species described are arthropods. % of representation of extant arthropod groups: subphylum crustacea: 6, subphylum chelicerata: 5. 5, subphylum myriapoda: 1, class: insecta. Burgess shale, yoho national parl, b. c: extinct: subphylum trilobita, fossils from the cambrian period: 505 million years ago. Phylum arthropoda categorizing: subphylum chelicerata, class merostomata e. g. horseshoe crabs. Limulus amebocyte lysate: class pycnogonida e. g. sea spiders, class archnida e. g. spiders, scorpions. Inhabit virtually all known habitats in world: exoskeleton highly protective, particularly against dessication, tagmatization segments fused and/or modified in different regions of the body for specific functions. Specialized appendages: efficient gas exchange systems, particularly in terrestrial forms, highly developed sense organs, complex behavior patterns, metamorphosis, resulting in less competition for resources. Also called cuticle (divided into parts: epicuticle , external surface, composed of lipoprotein, with an overlying lipid waxy layer.
