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 Antrechinus mortenseni (ontogeny) Description Diagrammatic longitudinal section showing fertilization, growth and "birth" of juveniles: a. The sperm of the male fertilizes the egg (1,8 mm long), which has left the gonads to be deposited in one brood pouch. b.The egg grows to a short-spined juvenile (3 mm) in the expanding brood pouch. c. The original juvenile has reached the long-spined stage (4,5 mm) as new eggs are fertilized in the other pouches. d. The apical plates hinge downwards to enlarge the aperture when the juvenile leaves the pouch. It is "born". e. The young sea urchin starts his independent life, while the other eggs continue to develop.JPG file - 217.13 kB - 1 980 x 988 pixelsadded on 2005-02-23308 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha...© 2005 Schultz, HeinkeClick here to return to the thumbnails overview |
