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- W2078168399 abstract ". Pomacea canaliculata is an internally fertilizing gastropod that produces, besides fertilizing sperm (=eusperm), a large number of unfertile sperm (=parasperm) that have no chromatin, are fusiform, and have three to five flagella. Here, we report that this snail also produces another type of parasperm, which results from a peculiar spermiogenesis including an anterior cytoplasmic migration. The mature oligopyrene parasperm has: (1) a rounded head including a partly lysed nucleus, (2) a conical mid-piece with eight large mitochondrial structures, and (3) a single flagellum (∼20 μm). These characteristics, although not found in any other gastropod parasperm, are shared with the externally fertilizing “ectaquasperm” and with the early spermiogenic stages of internally fertilizing “introsperm” found among the Annelida and basal Mollusca. There are indications that this sperm type may be produced by a truncation of euspermiogenesis, as proposed by Buckland-Nicks & Scheltema for the expression of ectaquasperm in bilaterian evolution." @default.
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- W2078168399 date "2009-08-01" @default.
- W2078168399 modified "2023-10-18" @default.
- W2078168399 title "Ectaquasperm-like parasperm in an internally fertilizing gastropod" @default.
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- W2078168399 doi "https://doi.org/10.1111/j.1744-7410.2009.00158.x" @default.
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