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- W2299684791 abstract "Abstract The morphology of bony hooks on anal-fin and pelvic-fin rays in six neotropical characid fish ( Astyanax fasciatus , A. lacustris , Hyphessobrycon bifasciatus , H. itaparicensis , Compsura heterura and Serrapinnus heterodon ) representing different reproductive modes (inseminating and externally fertilizing) was analysed with a particular focus on the form, distribution, development and orientation of bony hooks of the male anal-fin and pelvic-fin rays. When present bony hooks of the anal-fin and pelvic-fin rays in adult males represented a permanent structure and its development is likely closely related to the reproductive phase. Bony hooks were found on anal-fin and pelvic-fin rays in A. lacustris , C. heterura , H. itaparicensis and S. heterodon whereas A. fasciatus and H. bifasciatus showed bony hooks only on the anal-fin rays. The absence of pelvic-fin rays may be related to hormonal factors and linked to the courtship behavior. Despite their reproductive mode, the bony hooks on anal-fin and pelvic-fin rays were positioned along the posterolateral border. On pelvic-fin rays, the distal tips of the bony hooks were directed towards the anterior fin ray border in inseminating or non-inseminating species. On the anal-fin rays, the distal tips of the hooks were morphologically different in inseminating and externally fertilizing species. Inseminating characids such as C. heterura exhibited a distinct morphological arrangement of hooks exclusively present on pelvic-fin rays similar to the structures found in inseminating species. The number of bony hooks on anal-fin rays was higher only among the Cheirodontinae such as C. heterura and S. heterodon regardless of their reproductive mode. Apparently the presence and morphology of bony hooks on fin rays represent an important data source for phylogenetic, reproductive and behavioral studies of characid fish." @default.
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- W2299684791 date "2016-01-01" @default.
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- W2299684791 title "Comparative morphology of bony hooks of the anal and pelvic fin in six neotropical characid fishes (Ostariophysi: Characiformes)" @default.
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- W2299684791 doi "https://doi.org/10.1016/j.jcz.2016.01.003" @default.
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