Arthropod head problem (original) (raw)
The (pan)arthropod head problem is a long-standing zoological dispute concerning the segmental composition of the heads of the various arthropod groups, and how they are evolutionarily related to each other. While the dispute has historically centered on the exact make-up of the insect head, it has been widened to include other living arthropods such as chelicerates, myriapods, crustaceans; and fossil forms, such as the many arthropods known from exceptionally preserved Cambrian faunas. While the topic has classically been based on insect embryology, in recent years a great deal of developmental molecular data has become available. Dozens of more or less distinct solutions to the problem, dating back to at least 1897, have been published, including several in the 2000s.
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| dbo:abstract | The (pan)arthropod head problem is a long-standing zoological dispute concerning the segmental composition of the heads of the various arthropod groups, and how they are evolutionarily related to each other. While the dispute has historically centered on the exact make-up of the insect head, it has been widened to include other living arthropods such as chelicerates, myriapods, crustaceans; and fossil forms, such as the many arthropods known from exceptionally preserved Cambrian faunas. While the topic has classically been based on insect embryology, in recent years a great deal of developmental molecular data has become available. Dozens of more or less distinct solutions to the problem, dating back to at least 1897, have been published, including several in the 2000s. The arthropod head problem is popularly known as the endless dispute, the title of a famous paper on the subject by Jacob G. Rempel in 1975, referring to its seemingly intractable nature. Although some progress has been made since that time, the precise nature of especially the labrum and the pre-oral region of arthropods remain highly controversial. (en) La artropodkapa problemo estas long-daŭra zoologia disputo koncerne el la segmenta kompono de la kapoj de la variaj artropodaj grupoj, kaj kiel ili estas evolucie rilataj unuj al aliaj. Kvankam la disputo historie centriĝis al la preciza formado de la kapo de insektoj, ĝi plilarĝiĝis por inkludi aliajn vivantajn artropodojn kiaj la krustacoj kaj la keliceruloj; kaj eĉ la fosiliajn formojn, kiel la multaj artropodoj konataj el la escepte bone konservata faŭno de Kambrio. Kvankam la temo estis klasike bazita sur la insekta embriologio, en ĵusaj jaroj iĝis disponebla granda kvanto el disvolviga molekula informaro. Oni publikigis dekojn da pli malpli diferencaj solvoj al la problemo, date eĉ el almenaŭ 1897, ĝis kelkaj el la 2000-aj jaroj. La artropodkapa problemo estas populare konata kiel senfina disputo, nome la titolo de fama artikolo pri la temo fare de Jacob G. Rempel en 1975, reference al ties ŝajne netraktebla naturo. Kvankam oni faris ioman progreson ekde tiame, la preciza naturo de ĉefe la labrum kaj de la antaŭbuŝa regiono de artropodoj restas tre polemikiga. (eo) |
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| dbp:align | right (en) |
| dbp:date | June 2016 (en) |
| dbp:quote | It would be too bad if the question of head segmentation ever should be finally settled; it has been for so long such fertile ground for theorizing that arthropodists would miss it as a field for mental exercise. (en) |
| dbp:source | R.E. Snodgrass, 1960 (en) |
| dbp:talk | Outdated (en) |
| dbp:width | 25.0 |
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| gold:hypernym | dbr:Dispute |
| rdf:type | dbo:MilitaryConflict |
| rdfs:comment | The (pan)arthropod head problem is a long-standing zoological dispute concerning the segmental composition of the heads of the various arthropod groups, and how they are evolutionarily related to each other. While the dispute has historically centered on the exact make-up of the insect head, it has been widened to include other living arthropods such as chelicerates, myriapods, crustaceans; and fossil forms, such as the many arthropods known from exceptionally preserved Cambrian faunas. While the topic has classically been based on insect embryology, in recent years a great deal of developmental molecular data has become available. Dozens of more or less distinct solutions to the problem, dating back to at least 1897, have been published, including several in the 2000s. (en) La artropodkapa problemo estas long-daŭra zoologia disputo koncerne el la segmenta kompono de la kapoj de la variaj artropodaj grupoj, kaj kiel ili estas evolucie rilataj unuj al aliaj. Kvankam la disputo historie centriĝis al la preciza formado de la kapo de insektoj, ĝi plilarĝiĝis por inkludi aliajn vivantajn artropodojn kiaj la krustacoj kaj la keliceruloj; kaj eĉ la fosiliajn formojn, kiel la multaj artropodoj konataj el la escepte bone konservata faŭno de Kambrio. Kvankam la temo estis klasike bazita sur la insekta embriologio, en ĵusaj jaroj iĝis disponebla granda kvanto el disvolviga molekula informaro. Oni publikigis dekojn da pli malpli diferencaj solvoj al la problemo, date eĉ el almenaŭ 1897, ĝis kelkaj el la 2000-aj jaroj. (eo) |
| rdfs:label | Artropodkapa problemo (eo) Arthropod head problem (en) |
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