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- W2010069676 abstract "Sperm ultrastructure of two brachiopod species were investigated with the aim of getting a better insight in the phylogenetic relations between this and other animal phyla. Spermatozoa from Crania anomala (class Inarticulata) were found to have a long and complex acrosome, four mitochondria, and two orthogonal centrioles in the midpiece. Spermatozoa from Terebratulina caput-serpentis (class Articulata) were found to have an inconspicuous acrosome, one single ring-shaped mitochondrion surrounding the two aligned centrioles, and a complex anchoring fiber apparatus. Although both kinds of spermatozoa belong to the “primitive type of spermatozoon”, characterizing animals with external fertilization, they are very different. The Terebratulina spermatozoon has many features which are typical of spermatozoa from lower deuterostomes, and the Crania spermatozoon seems slightly closer to those of the lower protostomes. These findings are in agreement with the concept that the brachiopods are close to the branching between these two coelomate lines and exhibit a mixture of features from both lines." @default.
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- W2010069676 date "1978-06-01" @default.
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- W2010069676 title "Fine structure of brachiopod spermatozoa" @default.
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- W2010069676 doi "https://doi.org/10.1016/s0022-5320(78)80054-9" @default.
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