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KMID : 0381919980280010063
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Korean Journal of Microscopy
1998 Volume.28 No. 1 p.63 ~ p.71
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Spermatozoal Ultrastructure and Phylogenetic Relationships of the Subfamily Gobioninae (Cyprinidae, Teleostei) 1. Ultrastructure of the Spermatozoa of the Korean Slender Gudgeon Squalidus gracilis majimae
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Lee Young-Hwan
Kim Kgu-Hwan
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Abstract
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The spermatozoon of Squalidus gracilis majimae is approximately $36.6{\mu}m$ in length and is characterized by a spherical nucleils with the clear chromatin, a short midpiece containing the mitochondria, and a flagellum positioned tangentially to the nucleus. An acrosome is absent as in all teleost fishes. The nucleus is about $1.9{\mu}m$ in diameter and in its periphery contains the electron-lucent chromatin distinguished from the electron-dense chromatin occupying most of the nucleus. The shallow nuclear fossa contains the proximal centriole, instead of two centrioles in deep nuclear fossa in siluroids. The proximal and distal centrioles are oriented approximately $140^{\circ}$ to each other. The mitochondria of 10 or more in number are arranged in three layers and do not surround the axoneme. The asymmetrical distribution of the mitochondria and the eccentrical position of the nucleus with regard to the tail are the general pattern of the cyprinid spermatozoa. S. gracilis majimae spermatozoa have the most mitochondria and the deepest cytoplasmic canal among cyprinid species. The flagellum lacks the lateral fins.
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KEYWORD
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Ultrastructure, Anacrosomal aquasperm, Mitochondria, Asymmetry, Squalidus gracilis majimae
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