Ultrastructure of the spermatozoon of the lizard Cnemidophorus sexlineatus (Sauria: Teiidae)

  • Newton W
  • Trauth S
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Abstract

Spermatozoa of Cnemidophorus sexlineatus were studied by transmission<br />and scanning electron microscopy. The cell is filiform, 62 micrometers<br />long and 0.6 micrometers in diameter. Organization of the midpiece<br />with five sets of ring structures and mitochondria (designated rsl/mil...<br />rs5/mi5), terminated by an annulus, an, is homologized to spermatozoa<br />of other species of lizards, notably Old World Lacerta. An acrosomal<br />filament composed of 8 nm fibers is present in spermatozoa isolated<br />from the ductus deferens. The nucleus has two curves which offset<br />the head of the sperm from the cell axis. The flagellar fibrous sheath<br />begins at rs3 and enwraps the flagellum to 1 micrometers above its<br />terminus. The flagellar axoneme is of the typical 9-doublet + 2-central-singlet<br />microtubule construction. The A-tubules contain electron-dense material.<br />Microtubule-fibrous sheath connectives and fibrous sheath-cell membrane<br />connectives were observed. Extracellular tubules attend maturing<br />spermatozoa in the ductus deferens. A maturation process is suggested<br />for male sex cells in the female tract. Spermatozoa in the ductus<br />deferens are characterized by spatulate acrosomes and bends of the<br />midpiece at rs2/mi2. Spermatozoa flushed from the oviduct/uterus<br />have pointed acrosomes and are straight in the midpiece

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Newton, W. D., & Trauth, S. E. (1992). Ultrastructure of the spermatozoon of the lizard Cnemidophorus sexlineatus (Sauria: Teiidae). Herpetologica, 48(3), 330–343. https://doi.org/10.1118/1.2767985

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