| 41. | It was previously placed in the monotypic genus " Sapheopipo ".
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| 42. | It is a monotypic species ( without any identified subspecies ) first horns.
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| 43. | Though seven species are in this family, five of them are monotypic.
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| 44. | It is sometimes placed in the monotypic genus " Aechmorhynchus ".
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| 45. | As presently defined, the little hermit is monotypic.
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| 46. | It is currently considered to be a monotypic genus.
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| 47. | Though commonly considered monotypic, evidence suggests some geographical variation in the appearance.
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| 48. | Consequently, the chestnut-capped thrush is monotypic.
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| 49. | As presently defined, the Guianan puffbird is monotypic.
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| 50. | The family is monotypic, having a single genus, with seven species.
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