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 4
... Skeletal rod echinoderms probably lies in a stock not unlike the minor coelomates of today , which also have an ... struts being filled with protoplasm . ( a ) Rudiment of young urchin Degenerating skeletal rod. 4.
... Skeletal rod echinoderms probably lies in a stock not unlike the minor coelomates of today , which also have an ... struts being filled with protoplasm . ( a ) Rudiment of young urchin Degenerating skeletal rod. 4.
Page 5
... skeletal struts , in addition to taking part in the initial formation of the skeleton , sub- sequently acts to keep the surfaces free of imper- fections which might seriously reduce its strength , rather as a surface flaw in a car ...
... skeletal struts , in addition to taking part in the initial formation of the skeleton , sub- sequently acts to keep the surfaces free of imper- fections which might seriously reduce its strength , rather as a surface flaw in a car ...
Page 7
... strut . One advantage of the single crystal , perhaps , is that it is possible to add to the existing skeletal elements in crystallographic continuity , maintaining the strength of the element . When an echinoderm skeleton becomes fos ...
... strut . One advantage of the single crystal , perhaps , is that it is possible to add to the existing skeletal elements in crystallographic continuity , maintaining the strength of the element . When an echinoderm skeleton becomes fos ...
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Common terms and phrases
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