A bifurcate tentacle in Ilyanassa obsoleta
نویسندگان
چکیده
منابع مشابه
Gangliogenesis in the prosobranch gastropod Ilyanassa obsoleta.
We determined that the larval nervous system of Ilyanassa obsoleta contains paired cerebral, pleural, pedal, buccal and intestinal ganglia and unpaired apical, osphradial, and visceral ganglia. We used a modified form of NADPH diaphorase histochemistry to compare the neuroanatomy of precompetent (including specimens 6, 8, and 12 days after hatching), competent, and metamorphosing larvae with po...
متن کاملA comparison of certain isozyme patterns in lobeless and normal embryos of the snail, Ilyanassa obsoleta.
A study was made of the emergence of certain enzymes during the embryogenesis of llyanassa. Lobeless and normal embryos were compared in order to determine the effect of polar lobe removal on subsequent molecular developments. Polyacrylamide gel electrophoresis in capillary tubes, a technique requiring only small numbers of embryos, was used to obtain the isozyme patterns of alkaline phosphatas...
متن کاملForaging by the mud snail, Ilyanassa obsoleta (Say), modulates spatial variation in benthic community structure
We investigated the foraging behavior of the mud snail, Ilyanassa obsoleta, and its consequences for macrobenthic community structure on mud flats on Long Island, NY, USA. Field sampling demonstrated strong spatial heterogeneity in the population densities of I. obsoleta. We experimentally tested three hypotheses: (i) I. obsoleta are strongly attracted to areas with high levels of detritus; (ii...
متن کاملMicrofilaments in the Polar Lobe Constriction of Fertilized Eggs of Ilyanassa Obsoleta
GARY W. CONRAD, DANIEL C . WILLIAMS, F. RUDOLF TURNER, KENNETH M. NEWROCK and RUDOLF A. RAFF. From the Division of Biology, Kansas State University, Manhattan, Kansas 66506, Mount Desert Island Biological Laboratory, Salisbury Cove, Maine 04672, and Department of Zoology, Indiana University, Bloomington, Indiana 47401 . Drs. Conrad and Williams are from Kansas State University and Mount Desert ...
متن کاملProgrammed cell death in the apical ganglion during larval metamorphosis of the marine mollusc Ilyanassa obsoleta.
The apical ganglion (AG) of larval caenogastropods, such as Ilyanassa obsoleta, houses a sensory organ, contains five serotonergic neurons, innervates the muscular and ciliary components of the velum, and sends neurites into a neuropil that lies atop the cerebral commissure. During metamorphosis, the AG is lost. This loss had been postulated to occur through some form of programmed cell death (...
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ژورنال
عنوان ژورنال: Science
سال: 1883
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-2.40.622-a