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Scanning electron microscope study of the development of mandibular structure and the molar surface morphology of Branchinella maduraiensis and Streptocephalus dichotomus (Crustacea, Anostraca)

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Abstract:

In the present study, the molar surface morphology of Streptocephalus dichotomus Baird, 1860 and Branchinella maduraiensis Raj, 1961 is analyzed and correlated with the distribution of these species in ephemeral pools. The larval stages of S. dichotomus are characterized by scanning electron microscopy in relation to their feeding physiology, which shows their morphological complexity during developmental stages. The larval mandible consists of a coxa with a three-segmented palp, and further development leads to its gradual transition into the adult mandible. Muscles involved in mandibular movement exhibit rotatory and counter-rotatory movement, which enhances the grinding of food materials. Analysis of the molar surface morphology of B. maduraiensis and S. dichotomus reveals that the mandibles are asymmetrical. Detailed analysis of the topography of the molar illustrates specific structural differences between the species. Gut content analysis also perfectly matches the molar morphology of these species, confirming that B. maduraiensis handles zooplankton more preferentially than S. dichotomus. Our investigation of these fairy shrimps provides information on their molar surface morphology and feeding biology, which increases the understanding of their coexistence.

Notre étude analyse la morphologie de la structure molaire de Streptocephalus dichotomus Baird, 1860 et de Branchinella maduraiensis Raj, 1961 et la met en corrélation avec leur répartition dans les étangs temporaires. Nous avons caractérisé les larves de S. dichotomus au microscope électronique à balayage en fonction de leur physiologie alimentaire; il existe une importante complexité morphologique au cours des différents stades du développement. La mandibule de la larve consiste en une coxa avec un palpe de trois articles; son évolution subséquente représente une transition graduelle vers la mandibule de l'adulte. Les muscles impliqués dans la trajectoire des mandibules impriment des mouvements de rotation et de contre-rotation, ce qui améliore la mouture des aliments. L'étude morphologique de la surface molaire deB. maduraiensis et de S. dichotomus montre que les mandibules sont asymétriques. L'analyse détaillée de la topographie des molaires révèle une différence spécifique de structure entre les deux espèces. Les résultats de l'analyse des contenus du tube digestif correspondent parfaitement à la morphologie molaire et ils confirment que B. maduraiensis manipule plus volontiers le zooplancton que S. dichotomus. Notre étude sur les entomostracés apporte des données sur la morphologie et la biologie de l'alimentation qui améliorent la compréhension de la coexistence des deux espèces.

Document Type: Research Article

Publication date: September 1, 2006

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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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