Structure, molting, and mineralization of the dorsal ossicle complex in the gastric mill of the blue crab, Callinectes sapidus

ABSTRACT This study examined the mesocardiac and urocardiac ossicles in the gastric mill of the blue crab to describe its structure, mineralization, and dynamics throughout the molt cycle, and to assess its possible utility in age determination. Morphologically, the mineralized ossicles are similar...

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Veröffentlicht in:Journal of morphology (1931) 2015-11, Vol.276 (11), p.1358-1367
Hauptverfasser: Vatcher, Hayley E., Roer, Robert D., Dillaman, Richard M.
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Roer, Robert D.
Dillaman, Richard M.
description ABSTRACT This study examined the mesocardiac and urocardiac ossicles in the gastric mill of the blue crab to describe its structure, mineralization, and dynamics throughout the molt cycle, and to assess its possible utility in age determination. Morphologically, the mineralized ossicles are similar to the calcified dorsal carapace having a lamellate structure comprised of sheets of chitin/protein fibrils. Staining with acridine orange showed the same arrangement of an epicuticle, exocuticle, and endocuticle. In much of the mesocardiac and urocardiac ossicles, the endocuticle is very reduced, with the exocuticle predominating; the reverse of the dimensions of the exoskeleton. The lamellate structure of the ossicles was confirmed with scanning electron microscopy; however, elemental mapping by energy‐dispersive analysis of X‐rays revealed that the ossicles are mineralized with calcium phosphate, in contrast to the calcium carbonate biomineral of the exoskeleton. The medial tooth of the urocardiac ossicle is not calcified, but the epicuticle is highly elaborated and impregnated with silica. Histological examination of the ossicles demonstrated that they are molted during ecdysis, so despite the appearance of bands in the mesocardiac ossicle, it is difficult to hypothesize how the bands could represent a record of chronological age. J. Morphol. 276:1358–1367, 2015. © 2015 Wiley Periodicals, Inc.
doi_str_mv 10.1002/jmor.20423
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Morphologically, the mineralized ossicles are similar to the calcified dorsal carapace having a lamellate structure comprised of sheets of chitin/protein fibrils. Staining with acridine orange showed the same arrangement of an epicuticle, exocuticle, and endocuticle. In much of the mesocardiac and urocardiac ossicles, the endocuticle is very reduced, with the exocuticle predominating; the reverse of the dimensions of the exoskeleton. The lamellate structure of the ossicles was confirmed with scanning electron microscopy; however, elemental mapping by energy‐dispersive analysis of X‐rays revealed that the ossicles are mineralized with calcium phosphate, in contrast to the calcium carbonate biomineral of the exoskeleton. The medial tooth of the urocardiac ossicle is not calcified, but the epicuticle is highly elaborated and impregnated with silica. Histological examination of the ossicles demonstrated that they are molted during ecdysis, so despite the appearance of bands in the mesocardiac ossicle, it is difficult to hypothesize how the bands could represent a record of chronological age. J. 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Morphologically, the mineralized ossicles are similar to the calcified dorsal carapace having a lamellate structure comprised of sheets of chitin/protein fibrils. Staining with acridine orange showed the same arrangement of an epicuticle, exocuticle, and endocuticle. In much of the mesocardiac and urocardiac ossicles, the endocuticle is very reduced, with the exocuticle predominating; the reverse of the dimensions of the exoskeleton. The lamellate structure of the ossicles was confirmed with scanning electron microscopy; however, elemental mapping by energy‐dispersive analysis of X‐rays revealed that the ossicles are mineralized with calcium phosphate, in contrast to the calcium carbonate biomineral of the exoskeleton. The medial tooth of the urocardiac ossicle is not calcified, but the epicuticle is highly elaborated and impregnated with silica. Histological examination of the ossicles demonstrated that they are molted during ecdysis, so despite the appearance of bands in the mesocardiac ossicle, it is difficult to hypothesize how the bands could represent a record of chronological age. J. 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Morphologically, the mineralized ossicles are similar to the calcified dorsal carapace having a lamellate structure comprised of sheets of chitin/protein fibrils. Staining with acridine orange showed the same arrangement of an epicuticle, exocuticle, and endocuticle. In much of the mesocardiac and urocardiac ossicles, the endocuticle is very reduced, with the exocuticle predominating; the reverse of the dimensions of the exoskeleton. The lamellate structure of the ossicles was confirmed with scanning electron microscopy; however, elemental mapping by energy‐dispersive analysis of X‐rays revealed that the ossicles are mineralized with calcium phosphate, in contrast to the calcium carbonate biomineral of the exoskeleton. The medial tooth of the urocardiac ossicle is not calcified, but the epicuticle is highly elaborated and impregnated with silica. Histological examination of the ossicles demonstrated that they are molted during ecdysis, so despite the appearance of bands in the mesocardiac ossicle, it is difficult to hypothesize how the bands could represent a record of chronological age. J. Morphol. 276:1358–1367, 2015. © 2015 Wiley Periodicals, Inc.</abstract><cop>United States</cop><pub>Blackwell Publishing Ltd</pub><pmid>26473637</pmid><doi>10.1002/jmor.20423</doi><tpages>10</tpages></addata></record>
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subjects Animals
biomineralization
Bone and Bones - anatomy & histology
Bone and Bones - ultrastructure
Brachyura - anatomy & histology
Brachyura - physiology
Brachyura - ultrastructure
calcification
Calcification, Physiologic
Callinectes sapidus
Marine
Molting - physiology
silicification
Tissue Fixation
tooth
title Structure, molting, and mineralization of the dorsal ossicle complex in the gastric mill of the blue crab, Callinectes sapidus
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