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Title

Morphology and ultrastructure of the esophagus during the ontogeny of the spider crab Maja brachydactyla (Decapoda, Brachyura, Majidae)

AuthorsCastejón, Diego ; Rotllant, Guiomar ; Ribes, Enric; Durfort, Mercè; Guerao, Guillermo
KeywordsEpithelium
Microspines
Rosette glands
Larval development
Eucrustacea sensu Walossek 1999
Issue DateJun-2018
PublisherWiley-Liss
CitationJournal of Morphology 279(6): 710-723 (2018)
AbstractThe esophagus of the eucrustaceans is known as a short tube that connects the mouth with the stomach but has generally received little attention by the carcinologists, especially during the larval stages. By this reason, the present study is focused on the morphology and ultrastructure of the esophagus in the brachyuran Maja brachydactyla during the larval development and adult stage. The esophagus shows internally four longitudinal folds. The simple columnar epithelium is covered by a thick cuticle. The epithelial cells of the adults are intensively interdigitated and show abundant apical mitochondria and bundles of filamentous structures. The cuticle surface has microspines and mutually exclusive pores. Three muscle layers surrounded by the connective tissue are reported: circular muscles forming a broad continuous band, longitudinal muscle bundles adjacent to the circular muscles, and dilator muscles crossing the connective tissue vertically toward the epithelium. The connective tissue has rosette glands. The esophagus of the larvae have epithelial cells with big vesicles but poorly developed interdigitations and filamentous structures, the cuticle is formed by a procuticle without differentiated exocuticle and endocuticle, the connective layer is thin and the rosette glands are absent. The observed features can be explained by his role in the swallowing of the food
Description14 pages, 8 figures, supporting information https://doi.org/10.1002/jmor.20805
Publisher version (URL)https://doi.org/10.1002/jmor.20805
URIhttp://hdl.handle.net/10261/169944
Identifiersdoi: 10.1002/jmor.20805
issn: 0362-2525
e-issn: 1097-4687
Appears in Collections:(ICM) Artículos
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