Diversidade morfológica de cerdas do aparato bucal em três espécies de sesarmidae (crustacea, decapoda, brachyura, grapsoidea)
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Data
2021-01-28
Autores
Gomes, Tassia Turini
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Universidade Estadual Paulista (Unesp)
Resumo
No presente estudo foi investigada a diversidade dos tipos de cerdas do aparato bucal nas espécies de sesarmídeos Aratus pisonii, Armases angustipes e Sesarma rectum. O aparato bucal, em espécies de Decapoda, exibe uma variedade de funções e adaptações, não só relacionadas a alimentação, mas também são importantes no comportamento secundário de grooming. Caranguejos grapsóideos, especialmente os pertencentes a Sesarmidae, apresentam forte tendência à herbivoria. O amplo repertório de hábitos alimentares e diferentes estratégias para limpeza do corpo levou a um interesse na morfologia e nas adaptações das peças bucais e de suas unidades funcionais constituintes, as cerdas. Foram encontradas cerdas dos seguintes tipos: paposa, plumosa, plumodenticulada, serrada, simples, cuspidada, e respectivos subtipos. Dois novos tipos de cerdas sem registros na literatura, cerda capitada e cluster serrated, são descritas. A morfologia funcional das cerdas paposas parece estar mais relacionada com formação de tela setal e filtração de água inalante; plumosas em promover fluxo de água; plumodenticuladas apresentam multifuncionalidade; serradas, em ação de escovação ou abrasão; simples e cuspidadas, com manipulação de alimentos. Os aparatos bucais das três espécies são majoritariamente semelhantes, mas A. pisonii possui diferenças marcantes, sendo a única espécie a possuir o tipo de cerda capitada nas peças bucais, cerdas plumodenticuladas no processo mandibular e tufos de cerdas cluster serrated no quelípodo. Por ser considerada a espécie mais herbívora, dentre as estudadas, essas diferenças são possivelmente relacionadas a esta tendência alimentar.
In the present study, the diversity of the setal types of the oral apparatus in the species of sesarmids Aratus pisonii, Armases angustipes and Sesarma rectum was investigated. The oral apparatus, in Decapoda species, exhibits a variety of functions and adaptations, not only related to feeding, but also important in secondary grooming behavior. Grapsoid crabs, especially those belong to Sesarmidae, have a strong tendency to herbivory. The wide repertoire of eating habits and different strategies for cleaning the body led to an interest in the morphology and adaptations of the oral parts and their constituent functional units, the setae. Setae of the following types were found: pappose, plumose, plumodenticulate, serrated, simple, cuspidate, and respective subtypes. Two new types of setae, without records in the literature, capitated setae and cluster serrated, are described. The functional morphology of the pappose setae seems to be more related to the formation of a setal mesh and filtration of inhalant water; plumose in promoting water flow; plumodenticulate have multifunctionality; serrated, in action of brushing or abrasion; simple and cuspidate, with food handling. The buccal apparatus of the three species are mostly similar, but A. pisonii has marked differences, being the only species to have the type of capitated setae in the oral parts, plumodenticulate setae in the mandibular process and tufts of cluster serrated setae in the chelipod. As it is considered the most herbivorous species, among those studied, these differences are possibly related to this feeding trend
In the present study, the diversity of the setal types of the oral apparatus in the species of sesarmids Aratus pisonii, Armases angustipes and Sesarma rectum was investigated. The oral apparatus, in Decapoda species, exhibits a variety of functions and adaptations, not only related to feeding, but also important in secondary grooming behavior. Grapsoid crabs, especially those belong to Sesarmidae, have a strong tendency to herbivory. The wide repertoire of eating habits and different strategies for cleaning the body led to an interest in the morphology and adaptations of the oral parts and their constituent functional units, the setae. Setae of the following types were found: pappose, plumose, plumodenticulate, serrated, simple, cuspidate, and respective subtypes. Two new types of setae, without records in the literature, capitated setae and cluster serrated, are described. The functional morphology of the pappose setae seems to be more related to the formation of a setal mesh and filtration of inhalant water; plumose in promoting water flow; plumodenticulate have multifunctionality; serrated, in action of brushing or abrasion; simple and cuspidate, with food handling. The buccal apparatus of the three species are mostly similar, but A. pisonii has marked differences, being the only species to have the type of capitated setae in the oral parts, plumodenticulate setae in the mandibular process and tufts of cluster serrated setae in the chelipod. As it is considered the most herbivorous species, among those studied, these differences are possibly related to this feeding trend
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Palavras-chave
Cerdas, Aparato bucal, Morfologia funcional, Caranguejos, Decápode (Crustáceo), Brachyura, Morfologia (Biologia), Herbivoria, Seate, Buccal apparatus, Functional morphology, Herbivory