Ciliary structures in the branchial unicellular glands of the grass shrimp,Palaemonetes pugio

Summary A unicellular exocrine gland possessing an epicuticular ductule occurs in grass shrimp gills. This gland displays ultrastructural changes in relation to the molt cycle. These changes include an increase in the quantity of secretory granules during late premolt, and the development of ciliary axonemes in relation to ductule formation.This investigation was supported in part by grant CR-807417 from the U.S. Environmental Protection Agency.