| 31. | Dryomyzid flies are found principally in the Holarctic, though some are found in the Southern Hemisphere.
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| 32. | In phytogeography, the Sonoran Desert is within the Sonoran Holarctic Kingdom of the northern Western Hemisphere.
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| 33. | Although they are distributed worldwide most species are in the Holarctic region where there are 19 genera.
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| 34. | Its distribution is holarctic, it being found in northern Europe, northern Asia and North America.
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| 35. | The Holarctic kingdom, in contrast, incorporates the whole of the Northern Hemisphere north of the tropics.
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| 36. | With warmer temperatures, insect infestation will become a greater problem throughout the northern parts of the Holarctic.
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| 37. | It diverged from its common ancestor with other species soon after the Holarctic and the tropical lineages split.
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| 38. | A few solitary midges are found in the Southern Hemisphere, but Thaumaleidae are generally an Holarctic family.
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| 39. | They are Holarctic in distribution, with most species in Europe, Central Asia, and North America.
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| 40. | This aphid has a Holarctic distribution and is known from Europe, Asia, North America and Argentina.
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