. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. lACini'LEVS TRIOENTATL'S HEMOCYTES 61. Figure 14. Granulocyte from Tachyplcus tridentalus incubated with 10 * g endotoxin per ml hemo- lymph for 300 s. After exocytosis, the remaining organelles collect in the middle of the cell surrounded by microtubules (arrowheads) as observed also in Limn/us polyphemus (Tablin and Levin. 1988). Digestive vacuoles (DV). Immature granule (IG); nucleus (N). Discussion Two major groups ofhemocytes We reveal one granular and one almost agranular type of hemocyte in the general circulation of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. lACini'LEVS TRIOENTATL'S HEMOCYTES 61. Figure 14. Granulocyte from Tachyplcus tridentalus incubated with 10 * g endotoxin per ml hemo- lymph for 300 s. After exocytosis, the remaining organelles collect in the middle of the cell surrounded by microtubules (arrowheads) as observed also in Limn/us polyphemus (Tablin and Levin. 1988). Digestive vacuoles (DV). Immature granule (IG); nucleus (N). Discussion Two major groups ofhemocytes We reveal one granular and one almost agranular type of hemocyte in the general circulation of T. tridentatus (Figs. 1, 2, 15). In agreement with the terminology from other arthropods, including other chelicerates. these he- mocytes are named granulocytes and plasmatocytes, re- spectively (Gupta, 1979; Sherman, 1981; Gupta, 1985; Suhr-Jessen et al., 1989). Their main differences are summarized in Table II. The plasmatocyte has not pre- viously been observed in T. tridentatus, but it makes up about 3% of the hemocytes in all samples from the six animals studied. The plasmatocyte is not a cyanoblast or a cyanocyte (Fahrenbach, 1970), because plasmatocytes have the same size, are present in the general circulation of all ani- mals studied at all times, and do not contain cytoplasmic crystals. The plasmatocyte is not a granulocyte that exocy- tosed during sampling, because the two cells differ in amounts of hetrochromatin, RER, free ribosomes, and mitochondria (Table II). In other systems, such dra- matic changes usually takes hours. Furthermore, the plasmatocyte has the smooth ellipsoidal shape with a marginal band characteristic of the unstimulated gran- ulocyte in contrast to the pseudopodial form following exocytosis (Figs. 1, 13; Dumont etai, 1966; Armstrong, 1980; Armstrong and Rickles, 1982; Armstrong, 1985; Tablin and Levin, 1988). However, it cannot be ex- cluded that plasmatocytes are granulocytes, which have undergone spontaneous exocytosis so early prior to hemol
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