Oxford Biology Readers: Nichols, D. The uniqueness of the echinodermsJohn Juan Head, O. E. Lowenstein Oxford University Press, 1971 - Biology |
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Page 3
... substances and excretory products around the body ( see Fig . 12 ) . Another example : most animals requiring skeletal support adopt a two- phase skeletal system , in which a rigid crystalline phase is interspersed with a pliant ...
... substances and excretory products around the body ( see Fig . 12 ) . Another example : most animals requiring skeletal support adopt a two- phase skeletal system , in which a rigid crystalline phase is interspersed with a pliant ...
Page 4
... substances directly into the external epithelium covering nearly all the external surfaces . The animal would develop ( see Fig . 2 ) from its egg by radial cleavage ( as opposed to the spiral cleavage of most other invertebrates ) ...
... substances directly into the external epithelium covering nearly all the external surfaces . The animal would develop ( see Fig . 2 ) from its egg by radial cleavage ( as opposed to the spiral cleavage of most other invertebrates ) ...
Page 5
... substances required on the outer surface . So the cell - filled spaces within the skeletal elements provide pathways for the passage of these wandering cells . Again , diffusion plays a large part in gas exchange , and one assumes that ...
... substances required on the outer surface . So the cell - filled spaces within the skeletal elements provide pathways for the passage of these wandering cells . Again , diffusion plays a large part in gas exchange , and one assumes that ...
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adult ampullae animal groups animal kingdom anus basi-epithelial plexus bilateral bilateral symmetry Biol blastopore body skeleton body surface body wall brittle-stars burrow calcite canal system cavities cell stage chordates coelenterates Collagen connective tissue crinoids derms diagram to show echino echinoderm groups echinoderm skeleton Echinodermata echinoids effector organs enterocoel epithelial cells feed five radii five-rayed fluid fold pattern fossil function glandular pedicellaria integument invertebrates jaw tip Left mesocoel light mechanical stimulus madreporite metry microvilli motor muscles nerve plexus nervous system nutrients nutritional orientated fibres ossicle Oxford Biology Readers pathways pedicellarial head phylum physiological pluteus larva poison pressure probably radial cleavage radial mid-line Radial nerve radius ring Schematic diagram sea-urchin sensory endings Sensory hillock show the water-vascular shown in Fig single crystal Skeletal rod skeletal struts skeletally supported soluble spiral cleavage starfish tube-foot structures substances superficial symmetry tube tube-feet upwardly directed mouth valves water-vascular system young urchin