| 21. | They are dimorphocerataceans in which the external lateral lobes and prongs of the ventral lobe are bifid.
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| 22. | The stamen is 8 15 mm long, and can be acute or bifid at the apex.
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| 23. | The maxillula has both laciniae slender and ending in bristles and spines; the palp is distinctly bifid.
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| 24. | The mantle ridge is situated at either side of the anus and is reduced to three pairs of bifid tentacles.
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| 25. | Columella spirally ascends the umbilicus, terminating anteriorly in a massive bifid tooth, and higher up supporting a small tubercle.
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| 26. | The forelegs are well developed in both sexes, unlike in the Nymphalidae, and the bifid, unlike in the Papilionidae.
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| 27. | "Maximites " differs in having a bifid ventral lobe and a siphuncle that is ventral, but not marginal.
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| 28. | There may be as many as 100 stamens, with short filaments, and elongated, apically notched, deeply bifid anthers.
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| 29. | Historically, males born with a bifid penis often underwent sex reassignment surgery, due to the difficulty of hormone replacement therapy.
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| 30. | Many male marsupials naturally have a bifid penis, with left and right prongs that they insert into multiple vaginal canals simultaneously.
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