Formation of the inner branchiostegal cuticle of the blue crab, Callinectes sapidus

Journal of Morphology
E A Elliott, Richard M Dillaman

Abstract

The noncalcified inner branchiostegal cuticle, which lines the branchial chamber, was examined histologically and ultrastructurally over the molt cycle in the blue crab, Callinectes sapidus. In intermolt crabs (stage C4 ) the epithelium underlying the inner cuticle is cuboidal and has abundant intercellular spaces and a prominent basement membrane. Apolysis occurs at stage D0 and dissolution of the cuticle is accompanied by the formation of numerous lysosomes in the epithelium. During stage D1 , cells increase in height, apical mitochondria become more abundant, and the cuticle continues to be resorbed. An epicuticle is formed in early D2 , arising from a fusion of small subunits apparently attached to short apical microvilli. Cuticle deposition continues through D2 and is complete by stage D3 . By the time cuticle deposition is complete, the epithelium has become extremely columnar and cells are filled with bundles of microtubules. In stage D4 , an amorphous electron-dense core appears in the microtubule-filled cells, which are attached to the cuticle at their apical end and anchored to their basement membrane at the basal surface. These microtubule-filled cells persist through ecdysis, stage E, but during stage A1 the cores d...Continue Reading

References

Jan 1, 1972·Tissue & Cell·J P Green, M R Neff
Jan 1, 1969·Journal of Ultrastructure Research·A R Spurr
Mar 1, 1993·Experimental Cell Research·G Almouzni, A P Wolffe

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Citations

Mar 26, 2003·Journal of Morphology·C L WilliamsD M Gay
Mar 31, 2007·Journal of Morphology·Shinnosuke Yamada
Sep 22, 2016·Journal of Morphology·Katherine T Nesbit, Robert D Roer
Dec 26, 2006·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Lindsay M Faircloth, Thomas H Shafer

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