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Functional morphology of the neck organ in Artemia salina nauplii
Author(s) -
Hootman Seth R.,
Conte Frank P.
Publication year - 1975
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051450309
Subject(s) - biology , endoplasmic reticulum , golgi apparatus , cytoplasm , brine shrimp , organelle , anatomy , microbiology and biotechnology , apical cell , ultrastructure , lipid droplet , membrane , biochemistry , ecology
Fine structure of the ion transporting epithelium of the neck organ in the brine shrimp ( Artemia salina ) nauplius is described. The neck organ is a dome‐like gland situated atop the cephalothorax of the larva and is composed of 50 to 60 cuboidal epithelial cells. These cells possess many of the characteristics of salt‐secretory cells from other tissues. They contain many mitochondria and exhibit a high degree of plasma membrane elaboration. This membrane amplification takes two forms; the apical plasmalemma is infolded into irregular loops, while the basal and lateral membranes penetrate the cytoplasm in the form of branching sinusoids. The labyrinth of tubular reticulum thus formed fills most of the cell volume. Mitochondria in the labyrinth are often in intimate contact with these tubular membranes and regular arrays of parallel mitochondria with constricted intervening sinusoids are often observed. Other organelles including Golgi complexes, multivesicular bodies, and rough endoplasmic reticulum are also numerous, particularly in the narrow rim of cytoplasm which lies between the apical infolds and the labyrinth. Yolk platelets and glycogen fields are conspicuous in the basal perinuclear regions of the cells.