BLG 144 Lecture Notes - Lecture 9: Hydrostatic Skeleton, Protostome, Deuterostome

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5 May 2015
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Chapter 33 - protostomes gills with dual purpose include clams, oysters, mussels, scallops muscular ventral foot with single shell or none mostly herbivores & detrivores muscular foot modified as arms and/or tentacles hell internal & reduced or absent. Phylum mollusca recall: 3 main body components coelomate but mantle cavity to outside members with or without shell diverse subgroups with morphological variations bivalves (2-shelled): sessile, adults filter-feeding adults. Clade ecdysozoa diversity share common developmental mode (protostome) but also 1 major morphological similarity outer covering (cuticle/exoskeleton) will consider 2 major phyla here. Unsegmented few complex structures recall: pseudocoelom for hydrostatic skeleton strong cuticle fluid at high pressure only longitudinal muscles limits movement mostly free-living (important decomposers) (water and terrestrial environments) efficient predators. Rotifera, platyhelminthes, annelida, mollusca requires periodic molting for growth some parasitic (animals & plants) corresponding morphological adaptations. Phylum arthropoda recall: most diverse & numerous living animals external segmentation fusion into major sections exoskeleton with jointed limbs metamorphosis in many.

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