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A Decapod Hemocyte Classification Scheme Integrating Morphology, Cytochemistry, and Function.

J E Hose, G G Martin, A S Gerard

    The Biological Bulletin
    |January 10, 2018
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    Summary
    This summary is machine-generated.

    Traditional methods for identifying crustacean hemocytes are unreliable. A combined approach using morphology, cytochemistry, and cell function is necessary for accurate classification of hyaline cells and granulocytes.

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    Area of Science:

    • Marine Biology
    • Crustacean Immunology
    • Cell Biology

    Background:

    • Hemocytes are crucial for crustacean immunity and physiology.
    • Traditional classification of decapod hemocytes relies on morphology, which can be misleading.
    • Existing criteria fail to consistently differentiate hyaline cells and granulocytes across species.

    Purpose of the Study:

    • To propose a refined classification system for decapod crustacean hemocytes.
    • To establish reliable criteria for distinguishing hyaline cells and granulocytes.
    • To enhance understanding of hemocyte functions in crustaceans.

    Main Methods:

    • Morphological examination of hemocytes from Homarus americanus, Panulirus interruptus, and Loxorhynchus grandis.
    • Cytochemical staining and functional assays, including trypan blue uptake and enzyme activity.
    • Analysis of nucleocytoplasmic ratio and cytoplasmic inclusions.

    Main Results:

    • Morphological features alone are insufficient for accurate hemocyte identification.
    • Hyaline cells exhibit a higher nucleocytoplasmic ratio and accumulate trypan blue.
    • Granulocytes contain prophenoloxidase and hydrolases and are involved in phagocytosis.

    Conclusions:

    • A combination of morphological, cytochemical, and functional analyses is essential for reliable decapod hemocyte classification.
    • Hyaline cells initiate hemolymph coagulation, while granulocytes mediate foreign material defense.
    • The proposed criteria can be applied to other crustacean species to advance physiological understanding.