scholarly journals Some Observations on the Fine Structure of the Sinus Gland of a Land Crab, Gecarcinus lateralis

1958 ◽  
Vol 4 (5) ◽  
pp. 571-574 ◽  
Author(s):  
Mary H. Hodge ◽  
George B. Chapman
Keyword(s):  
Fine Structure ◽  
Size Range ◽  
Sinus Gland ◽  
Uniform Size ◽  
Brachyuran Crab ◽  
Land Crab ◽  
Dense Granules ◽  
The Core ◽  
Gecarcinus Lateralis ◽  
Cytoplasmic Processes

The dilated axon endings of the sinus glands of the brachyuran crab, Gecarcinus lateralis, are filled with homogeneously dense granules, each granule being bounded by a delicate membrane. The granules are of two orders of magnitude: 0.05 to 0.1 µ and 0.15 to 0.2 µ in diameter. Each axon ending contains granules of a nearly uniform size. Endings with granules of the larger size range predominate. Non-nervous cells endogenous to the sinus gland are scattered among the nerve endings. The cell contours are irregular, and cytoplasmic processes ramify between endings. The axons are unmyelinated, having only thin limiting membranes, and they possess many neurofibrils. Granules in preterminal portions of the axons tend to lie at the periphery of the fiber, and in some cases in chains at the core of the fiber. The granules appear to be storage and release centers for neurosecretory substances or their precursors.

Seasonal Changes in the Fine Structure of the Basal Granular Cells of the Bat Thyroid

1967 ◽  
Vol 2 (3) ◽  
pp. 401-410
Author(s):  
E. A. NUNEZ ◽  
R. P. GOULD ◽  
D. W. HAMILTON ◽  
J. S. HAYWARD ◽  
S. J. HOLT
Keyword(s):  
Fine Structure ◽  
Seasonal Changes ◽  
Follicular Epithelium ◽  
Thyroid Cell ◽  
Basal Region ◽  
Basal Cells ◽  
Uniform Size ◽  
Thyroid Cells ◽  
Cytoplasmic Matrix ◽  
Dense Granules

The fine structure of the thyroid gland of non-hibernating, hibernating, and intermittently aroused hibernating bats was examined. It was found that in addition to the ordinary follicular cell, another widespread thyroid cell type is present in all bats examined. This cell is situated in the basal region of the thyroid follicle and is characterized by a cytoplasm full of secretory-like granules. In the basal cells of bats captured in April and June the granules consist of an extremely dense core and are of a uniform size averaging from 0.1-0.5 µ in diameter. In bats caught in August the solid dense granules vary greatly in size and large granules of diameters from 2 to 5 µ are common. These large granules are often found concentrated in groups in the most basal region of the follicular epithelium. Hibernating bats are characterized by partly or totally degranulated basal thyroid cells. The cytoplasmic granules in the partly degranulated cell vary greatly in appearance, ranging from solid dense granules to empty vesicles. In totally degranulated basal cells, empty vesicles fill the cytoplasmic matrix. The granular endoplasmic reticulum of the basal thyroid cell also shows seasonal changes, while the Golgi complex remains a well-developed organelle throughout the year. These observations suggest that the thyroid basal granular cell is involved in secretory activities; its possible functional role is discussed.

Food Quality and Cannibalism in the Red Land Crab, Gecarcinus lateralis

1984 ◽  
Vol 57 (3) ◽  
pp. 318-324 ◽  
Author(s):  
Donna L. Wolcott ◽  
Thomas G. Wolcott
Keyword(s):  
Food Quality ◽  
Land Crab ◽  
Gecarcinus Lateralis

Seed and Seedling Predation of Bromelia pinguin L. by the Red Land Crab Gecarcinus lateralis Frem. in Veracruz, Mexico

Biotropica ◽  
1991 ◽  
Vol 23 (1) ◽  
pp. 96 ◽  
Author(s):  
Jose G. Garcia-Franco ◽  
Victor Rico-Gray ◽  
Oscar Zayas
Keyword(s):  
Land Crab ◽  
Seedling Predation ◽  
Gecarcinus Lateralis

The fine structure of Verson's glands in molting larvae of Calpodes ethlius (Hesperiidae, Lepidoptera)

1973 ◽  
Vol 51 (11) ◽  
pp. 1201-1210 ◽  
Author(s):  
Joan Lai-Fook
Keyword(s):  
Fine Structure ◽  
Secretory Cell ◽  
Duct Cell ◽  
Secretory Cells ◽  
Dense Granules ◽  
Cell Processes ◽  
Residual Bodies

The three cells which make up Verson's glands in Calpodes undergo drastic changes as they produce the cuticular linings and the secretions of the glands. The duct cell secretes only the typical cuticular duct. The saccule cell produces both the atypical cuticular saccule and dense granules which are discharged just before ecdysis. The secretory cell is much enlarged by vacuoles which remain separate until they too are discharged before ecdysis. Dense granules are also produced by the secretory cell. During deposition of the cuticular duct and saccule, their lumina arc packed with cell processes containing microtubules, which appear to arise from centrioles. Isolation and residual bodies appear in both the saccule and secretory cells even before discharge of their secretions.

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