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Related to urchin: sea urchin, sea urchin sting
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  • noun

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References in classic literature ?
"No," answered the urchin, pointing to the figure that had just been put up; "I want that other Jim.
The sea urchin has been used for many years as a model organism to identify key steps of animal fertilization and cellular events early in development (Briggs and Wessel, 2006).
Fishermen were trained on urchin and seaweed farming.
The experiment displayed a rapidly growing figure above the sea urchin to indicate an approaching predator.
Lee said that the massive gathering of sea urchins is larger in scale than previously observed and appears to be different than the mating behavior or of other species of sea urchin.
They are used for feeding and in some species are used by the sea urchin for locomotion.
The team is hopeful its discoveries will allow it to recreate optimal conditions in other damaged reef systems, restoring not only urchin populations, but also the myriad of other species that rely on healthy coral for their survival.
The rock-boring urchin (Echinometra lucunter) is a regular tropical echinoid characterized by the color of the test (or shell) and spikes ranging from dark tones to black.
Echinometra mathaei, Operational Sex Ratio, Sea Urchin, Sex Ratio.
Effects of salinity on fertilization, embryonic, and early larval development and growth performances of long-spined black sea urchin (Diademasetosum) were investigated in a controlled laboratory condition.
Sea urchin digestive processes may be considered among the best studied among marine invertebrates (Lewis, 1964; Trenzado et al., 2012; Lawrence, Lawrence, & Watts 2013).
Thus 21st century science has come to take seriously the idea that an urchin doesn't have an eye, but is an eye.