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The degree to which the area in front of the mouth is segmented remains one of the major controversies in the arthropod head problem. As already mentioned, earlier workers often considered the entire pre-oral region to be "acronal" and thus nonsegmental. Modern workers universally accept that at least the deuterocerebrum is segmental.
Head of a European hornet (Vespa crabro). In insects, head is a preferred term. The insect head consists of five segments, including three (the labial, maxillary and mandibular) necessary for food uptake, which are altogether known as the gnathocephalon and house the suboesophageal ganglion of the brain, as well as the antennal segment, and an ocular segment, as well as a non segmented fused ...
This is a list of invasive species in North America.A species is regarded as invasive if it has been introduced by human action to a location, area, or region where it did not previously occur naturally (i.e., is not a native species), becomes capable of establishing a breeding population in the new location without further intervention by humans, and becomes a pest in the new location ...
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Master Gardener: Poisonous plants invading Ohio. For premium support please call: 800-290-4726 more ways to reach us
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Nevertheless, despite being known from many specimens, disputes about its morphology, in particular its head appendages, have made it one of the most controversial of the Chengjiang taxa, and it has been discussed extensively in the context of the arthropod head problem. The genus is named after Fuxian Lake (Fuxian Hu), where it was unearthed.
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