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Figure 17 | Frontiers in Zoology

Figure 17

From: Ultrastructure of book gill development in embryos and first instars of the horseshoe crab Limulus polyphemus L. (Chelicerata, Xiphosura)

Figure 17

Regularly spaced channels (Ch) in the external cuticle (Cu) of the genital operculum after the fourth molt (stage 21). Limulus polyphemus. TEM. The channels are partially or completely filled with electron-opaque material. The nearby hypodermal cell (C) has endoplasmic reticulum (ER) and small, dense particles (P) that may be the same material that eventually fills and is likely released from the external opening of the channels. Scale, 0.5 μm.

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Frontiers in Zoology

ISSN: 1742-9994