| The most speciose insect orders like the Coleoptera, Diptera and Lepidoptera tend to have small genome sizes with very few or no exceptions. |
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| Scleroglossa is a diverse and speciose group including all remaining lizard families, plus snakes and amphisbaenians. |
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| Asynchronous flight muscle occurs in several of the more speciose insect orders, including beetles, true bugs, wasps and bees, and dipteran flies. |
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| The cricetid genus Peromyscus constitutes the most abundant and speciose group of North American mammals. |
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| Decapoda is the most speciose group within the Malacostraca. |
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| The simple thalloid and leafy liverwort clade is a morphologically diverse and speciose group of organisms. |
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| Several genera such as Ambystoma, Bolitoglossa, Hynobius, and Plethodon are very speciose, and within the Plethodontidae there has been much cryptic speciation that has been revealed by application of biochemical techniques. |
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