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Carapace and mandibles ontogeny in the Dendrobranchiata (Decapoda), Euphausiacea, and Mysidacea (Crustacea): a phylogenetic interest

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Abstract:

The ontogeny of the carapace and the mandibles has been studied for one species of Dendrobranchiata (Decapoda), four species of Euphausiacea, and three species of Mysidacea (one species of Lophogastrida and two species of Mysida). The protocephalic origin of the carapace, which arises from the antennar tergite, is confirmed. During larval development the progressive dorsal insertion of the carapace leads to the opening of the tergites of both cephalic and thoracic segments. The opening of the eight thoracic segments (TS) occurs in Euphausiacea and Decapoda only, and is done in three steps (TS1; TS1–TS3 or TS1–TS4; TS1–TS8). In adult Mysidacea, the insertion of the carapace exhibits two levels of evolution (opening of TS1 in Gnathophausia species and of TS1–TS4 in the others). Thus, in the larvae of Euphausiacea and Decapoda, the most evolved taxa, the progressive insertion of the carapace corresponds to the carapace locations in the adults of the most ancient taxa, i.e., Mysidacea. The location of the internal musculature of the mandibles, which is known for certain to characterize the different parts of the arthropodial segment, and their development, shows that the gnathal part of each mandible is prolonged by a pleural part and half the residual tergite of the mandibular segment.

L'ontogénie de la carapace et des mandibules a été étudiée chez une espèce de décapode Dendrobranchiata, quatre espèces d'euphausiacés et trois espèces de mysidacés (un Lophogastrida et deux Mysida). L'origine protocéphalique de la carapace, qui est issue du tergite antennaire, est confirmée. Au cours du développement larvaire, l'insertion dorsale progressive de la carapace entraîne l'ouverture des tergites céphaliques et thoraciques. L'ouverture des huit segments thoraciques (TS) ne s'observe que chez les euphausiacés et les décapodes, où elle s'effectue en trois étapes (TS1; TS1–TS3 ou TS1–TS4; TS1–TS8). Chez les mysidacés adultes, l'insertion de la carapace montre deux niveaux d'évolution (ouverture de TS1 chez les espèces de Gnathophausia et de TS1–TS4 chez les autres). Ainsi, chez les larves d'euphausiacés et de décapodes, taxons les plus évolués, l'insertion progressive de la carapace correspond à celles observées chez les adultes du taxon le plus ancien, i.e., celui des mysidacés. L'emplacement de la musculature interne des mandibles, qui définit de manière non équivoque les différentes parties du segment anthropodien, et leur développement, montrent que la partie gnathale de chaque mandibule se prolonge par une partie pleurale et par la moitié du tergite résiduel du segment mandibulaire.

Document Type: Research Article

Publication date: February 1, 2002

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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