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Spermatozoon of Chimaericola leptogaster. A-W, transverse sections, in antero-posterior sequence; X, longitudinal section. A-C, anteriormost part of spermatozoon; peripheral microtubules and progressive appearance of the two centrioles. D, E, one fully formed axoneme and section of the centriole of the other axoneme. F-H, peripheral microtubules (full ring in G,H), two axonemes, and mitochondrion. I, two axonemes, peripheral row of microtubules reduced to a few units, and mitochondrion. J, one axoneme, distal extremity of other axoneme as scattered doublets and central core, a few remaining peripheral microtubules, and mitochondrion. K-M, one axoneme and mitochondrion, a few peripheral microtubules. N-P, one axoneme, a few peripheral microtubules, mitochondrion and section of the anterior thin part of the nucleus, which is wider as sections are more posterior. Q-S, one axoneme, a few peripheral microtubules, mitochondrion, and section of nucleus approximately as wide as axoneme. T-W, one axoneme, a few peripheral microtubules, mitochondrion, and wide section of nucleus. W is a very wide section with electron-transparent chromatin. X, typical trepaxonematan axoneme. Scale in W, valid for all figures: 500 nm.
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