Abstract
Spermatozoa morphology of sulphur goatfish Upeneus sulphureus is studied by the methods of scanning and transmission electron microscopy. The shapes of spermatozoon heads are compared in U. sulphureus, U. tragula, U. margarethae, and Parupeneus multifasciatus. The U. sulphureus spermatozoon is characterized by the oval head flattened on a side, a nucleus with a deep U-shaped fossa, coaxially located centrioles, and two mitochondrial sections in the midpiece. On the flattened side of the head, its apical end is slightly pointed and bent. Based on the spermatozoon head shape, U. tragula and U. margarethae differ from all representatives of the family Mullidae with described sperm morphology in strongly bent and pointed apical end of the spermatozoon head and a single mitochondrial section in the midpiece. The data on comparative spermatozoa morphology are discussed in connection with current phylogenetic schemes.
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