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Observations of the ommatidium of the grass shrimp pandalus latirostris during light and dark adaptation



Observations of the ommatidium of the grass shrimp pandalus latirostris during light and dark adaptation



Biologiya Morya (Vladivostok) (4): 21-27



The ommatidium of the eye of the grass shrimp Pandalus latirostris comprises elements typical of crustaceans: dioptric apparatus (corneal lens 30-40 .mu.m thick, crystalline cone 420-430 .mu.m in length and two corneageneous cells), light isolating apparatus (distal pigment cells, red basal pigment cells and reflecting cells), and photosensitive system (retinula 150-160 .mu.m in length). The retinula is made up of eight photoreceptor cells, of which seven are morphologically identical and comprise almost entire length of the retinula. The eighth photoreceptor located in the distal part of the retinula is shorter (20-28 .mu.m in length) and morphologically differs from other photoreceptors. During light adaptation the pigment granules in the distal pigment cells and photoreceptors move along the optical axes of ommatidia. A number of changes can be observed in the cytoplasm of photoreceptors; numerous multivesicular bodies, lamellate bodies and small vesicles appear there.

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Accession: 006011503

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