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Four types of MT-contained structures: (a) proximal centriole in the early pig spermatid—formula “9×3 + 0”; (b) centriolar adjunct in the early pig spermatid—formula “9×2.5 + 0”; (c) flagellum in early pig spermatid—formula “9×2 + 2”; and (d) the cilia-like structure structurally similar to the primary cilium of mammals in the spermatid of the wasp Anisopteromalus calandrae—formula “9×2 + 0”. Scale bar: (a–d) 100 nm. (a–c) from [150]; and (d) from [20].
