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Gravity Perception in a Cladoceran-zooplankter: Anatomy of Antennal Socket Setae of Daphnia MagnaNight orientation in Daphnia magna was recently associated with setae on the basal socket of the swimming antennae. Daphnids are suspected of maintaining nocturnal equilibrium by monitoring the gravity vector through upward setal deflections caused by sinking between antennal swimming strokes. Setae appear to be hydrodynamic rheoceptors that sense the gravity vector indirectly by mechanoreceptivity to the direction and velocity of water currents. Neuroanatomical stains have revealed cell bodies at the base of the setal shafts, dendritic connections through to the distal ends of the shafts, and axonal tracts around the antennal socket connecting with an additional cell body and continuing toward the brain. These anatomical observations combined with previous scanning electron microscopy studies suggest that the setae are similar to mechanoreceptors and propreceptors used by higher crustaceans to sense water currents and gravity, and maintained balance.
Document ID
19850017746
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Meyers, D. G.
(Millsaps Coll. Jackson, MS, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1985
Publication Information
Publication: NASA. Washington NASA Space Biol. Program:
Subject Category
Life Sciences (General)
Accession Number
85N26057
Funding Number(s)
CONTRACT_GRANT: NAGW-643
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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