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The challenge that the arthropod head problem has to address is to what extent the various structures of the arthropod head can be resolved into a set of hypothetical ancestral segments. Given the high compaction and complexity of adult arthropod heads, much attention has been directed towards understanding the developmental processes that give ...
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.
Unsolved problems relating to the structure and function of non-human organs, processes and biomolecules include: Korarchaeota (archaea). The metabolic processes of this phylum of archaea are so far unclear. Glycogen body. The function of this structure in the spinal cord of birds is not known. Arthropod head problem. A long-standing zoological ...
In chelicerates and crustaceans, the cephalothorax is derived from the fusion of the cephalon and the thorax, and is usually covered by a single unsegmented carapace.In relation with the arthropod head problem, phylogeny studies show that members of the Malacostraca class of crustaceans have five segments in the cephalon, when not fused with the thorax to form a cephalothorax.
G. E. Budd. 2002. A palaeontological solution to the arthropod head problem. Nature 417: 271-275. G. E. Budd. 2006. On the origin and evolution of major morphological characters. Biological Reviews 81: 609-628. G. E. Budd. 2017. The origin of the animals and a ‘Savannah’ hypothesis for early bilaterian evolution. Biological Reviews 92(1 ...
In the diamondback moth, antennae serve to gather information about a host plant's taste and odor. After the desired taste and odor has been identified, the female moth will deposit her eggs onto the plant. [17] Giant swallowtail butterflies also rely on antenna sensitivity to volatile compounds to identify host plants. It was found that ...
Agriculture Department officials logged 69 instances of noncompliance with federal regulations at the Boar's Head plant in Jarratt from Aug. 1, 2023, through Aug. 2, 2024, ...
Arthropod eyes Head of a wasp with three ocelli (center), and compound eyes at the left and right. Most arthropods have sophisticated visual systems that include one or more usually both of compound eyes and pigment-cup ocelli ("little eyes"). In most cases, ocelli are only capable of detecting the direction from which light is coming, using ...