{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/92677"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/92677","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Morphology of Acercaria: investigations of the ovipositor and internal anatomy","abstract":"\"Acercaria, which includes Psocodea, Thysanoptera and Hemiptera, is a group that encompasses substantial diversity and has generated equally substantial debate about its higher-level phylogeny. The advent of molecular phylogenetics has done little to resolve arguments about the placement of various infraorders within Hemiptera, in spite of general confidence about their monophyly, which illustrates the need to take integrative approaches that include morphology as well as conduct more analyses across these higher groups as a whole. This thesis will attempt to address some of these issues in hemipteroid morphological research through projects covering two main topics. The first chapter reviews and updates previously described morphology with a treatment focusing on the ovipositor. By comparing ovipositors among representatives of Hemiptera's infraorders and describing their character states using a common lexicon for homologous structures, it became apparent that \"\"laciniate\"\" (plant-piercing) ovipositors vary in such a way that implies such a phenotype was independently derived in the lineages that have them. This not only demonstrates the limited usefulness in the terms \"\"laciniate\"\" and \"\"platelike\"\" to describe hemipteran ovipositor types, but also provides support to the historically-held hypothesis that the earliest heteropterans had substantially different a life history and reproductive ecology from its relatives in Cicadomorpha and Fulgoromorpha. The second chapter describes an effort to investigate digestive and nerve tissue morphology, which has previously been hypothesized to be phylogenetically informative in acercarians (Goodchild 1966; Niven et al 2009). X-ray micro-computed tomography was used instead of conventional dissection for this task, which allowed for the 3-D visualization of these tissues with their natural placements and arrangements kept intact. These resulting images were found to align with previous dissections of closely related taxa where available; in addition, potential phylogenetic signal was found in the abdominal and thoracic neuromeres, the fusion of which varied among taxa. Although more taxon sampling would be needed to verify how phylogenetically informative characters of the nervous system may be, the results here demonstrate the great potential for microCT imaging in opening and exploring novel and neglected avenues of morphological investigation.\"","abstract_html":""Acercaria, which includes Psocodea, Thysanoptera and Hemiptera, is a group that encompasses substantial diversity and has generated equally substantial debate about its higher-level phylogeny. The advent of molecular phylogenetics has done little to resolve arguments about the placement of various infraorders within Hemiptera, in spite of general confidence about their monophyly, which illustrates the need to take integrative approaches that include morphology as well as conduct more analyses across these higher groups as a whole. This thesis will attempt to address some of these issues in hemipteroid morphological research through projects covering two main topics. The first chapter reviews and updates previously described morphology with a treatment focusing on the ovipositor. By comparing ovipositors among representatives of Hemiptera's infraorders and describing their character states using a common lexicon for homologous structures, it became apparent that ""laciniate"" (plant-piercing) ovipositors vary in such a way that implies such a phenotype was independently derived in the lineages that have them. This not only demonstrates the limited usefulness in the terms ""laciniate"" and ""platelike"" to describe hemipteran ovipositor types, but also provides support to the historically-held hypothesis that the earliest heteropterans had substantially different a life history and reproductive ecology from its relatives in Cicadomorpha and Fulgoromorpha. The second chapter describes an effort to investigate digestive and nerve tissue morphology, which has previously been hypothesized to be phylogenetically informative in acercarians (Goodchild 1966; Niven et al 2009). X-ray micro-computed tomography was used instead of conventional dissection for this task, which allowed for the 3-D visualization of these tissues with their natural placements and arrangements kept intact. These resulting images were found to align with previous dissections of closely related taxa where available; in addition, potential phylogenetic signal was found in the abdominal and thoracic neuromeres, the fusion of which varied among taxa. Although more taxon sampling would be needed to verify how phylogenetically informative characters of the nervous system may be, the results here demonstrate the great potential for microCT imaging in opening and exploring novel and neglected avenues of morphological investigation."","abstract_has_math":false,"creators":["Austin, Chip"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Entomology","degree_department":null,"school":null,"contributors":["Dietrich, Christopher H."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-11-10T17:49:15Z","date_published":"2016-11-10T17:49:15Z","updated_at":"2026-07-22T22:26:35Z","subjects":["Acercaria","Hemiptera","Heteroptera","Homoptera","morphology","microCT","ovipositor","internal anatomy"],"languages":["en"],"rights":["Copyright 2016 Chip Austin"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/92677","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dietrich, Christopher H."]},{"key":"dc:creator","label":"Author","values":["Austin, Chip"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-11-10T17:49:15Z","2016-07-22","2016-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Entomology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Acercaria","Hemiptera","Heteroptera","Homoptera","morphology","microCT","ovipositor","internal anatomy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2016 Chip Austin"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/92677"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"Acercaria, which includes Psocodea, Thysanoptera and Hemiptera, is a group that encompasses substantial diversity and has generated equally substantial debate about its higher-level phylogeny. The advent of molecular phylogenetics has done little to resolve arguments about the placement of various infraorders within Hemiptera, in spite of general confidence about their monophyly, which illustrates the need to take integrative approaches that include morphology as well as conduct more analyses across these higher groups as a whole. This thesis will attempt to address some of these issues in hemipteroid morphological research through projects covering two main topics. The first chapter reviews and updates previously described morphology with a treatment focusing on the ovipositor. By comparing ovipositors among representatives of Hemiptera's infraorders and describing their character states using a common lexicon for homologous structures, it became apparent that \"\"laciniate\"\" (plant-piercing) ovipositors vary in such a way that implies such a phenotype was independently derived in the lineages that have them. This not only demonstrates the limited usefulness in the terms \"\"laciniate\"\" and \"\"platelike\"\" to describe hemipteran ovipositor types, but also provides support to the historically-held hypothesis that the earliest heteropterans had substantially different a life history and reproductive ecology from its relatives in Cicadomorpha and Fulgoromorpha. The second chapter describes an effort to investigate digestive and nerve tissue morphology, which has previously been hypothesized to be phylogenetically informative in acercarians (Goodchild 1966; Niven et al 2009). X-ray micro-computed tomography was used instead of conventional dissection for this task, which allowed for the 3-D visualization of these tissues with their natural placements and arrangements kept intact. These resulting images were found to align with previous dissections of closely related taxa where available; in addition, potential phylogenetic signal was found in the abdominal and thoracic neuromeres, the fusion of which varied among taxa. Although more taxon sampling would be needed to verify how phylogenetically informative characters of the nervous system may be, the results here demonstrate the great potential for microCT imaging in opening and exploring novel and neglected avenues of morphological investigation.\"","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-11-09 without embargo terms","The student, Chip Austin, accepted the attached license on 2016-07-21 at 14:34.","The student, Chip Austin, submitted this Thesis for approval on 2016-07-21 at 14:40.","This Thesis was approved for publication on 2016-07-22 at 13:45.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10058 on 2016-11-09 at 10:26:05","Made available in DSpace on 2016-11-10T17:49:15Z (GMT). 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The advent of molecular phylogenetics has done little to resolve arguments about the placement of various infraorders within Hemiptera, in spite of general confidence about their monophyly, which illustrates the need to take integrative approaches that include morphology as well as conduct more analyses across these higher groups as a whole. This thesis will attempt to address some of these issues in hemipteroid morphological research through projects covering two main topics. The first chapter reviews and updates previously described morphology with a treatment focusing on the ovipositor. By comparing ovipositors among representatives of Hemiptera's infraorders and describing their character states using a common lexicon for homologous structures, it became apparent that \"\"laciniate\"\" (plant-piercing) ovipositors vary in such a way that implies such a phenotype was independently derived in the lineages that have them. This not only demonstrates the limited usefulness in the terms \"\"laciniate\"\" and \"\"platelike\"\" to describe hemipteran ovipositor types, but also provides support to the historically-held hypothesis that the earliest heteropterans had substantially different a life history and reproductive ecology from its relatives in Cicadomorpha and Fulgoromorpha. The second chapter describes an effort to investigate digestive and nerve tissue morphology, which has previously been hypothesized to be phylogenetically informative in acercarians (Goodchild 1966; Niven et al 2009). X-ray micro-computed tomography was used instead of conventional dissection for this task, which allowed for the 3-D visualization of these tissues with their natural placements and arrangements kept intact. These resulting images were found to align with previous dissections of closely related taxa where available; in addition, potential phylogenetic signal was found in the abdominal and thoracic neuromeres, the fusion of which varied among taxa. Although more taxon sampling would be needed to verify how phylogenetically informative characters of the nervous system may be, the results here demonstrate the great potential for microCT imaging in opening and exploring novel and neglected avenues of morphological investigation.\"","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-11-09 without embargo terms","The student, Chip Austin, accepted the attached license on 2016-07-21 at 14:34.","The student, Chip Austin, submitted this Thesis for approval on 2016-07-21 at 14:40.","This Thesis was approved for publication on 2016-07-22 at 13:45.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10058 on 2016-11-09 at 10:26:05","Made available in DSpace on 2016-11-10T17:49:15Z (GMT). No. of bitstreams: 2 AUSTIN-THESIS-2016.pdf: 1904176 bytes, checksum: 2be6b5cf5e5b62e8e99099c5de4c8f67 (MD5) LICENSE.txt: 4212 bytes, checksum: d882b275aff5d971a8b59d9dd86ad13b (MD5) Previous issue date: 2016-07-22"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/92677"],"dc:language":["en"],"dc:rights":["Copyright 2016 Chip Austin"],"dc:subject":["Acercaria","Hemiptera","Heteroptera","Homoptera","morphology","microCT","ovipositor","internal anatomy"],"dc:title":["Morphology of Acercaria: investigations of the ovipositor and internal anatomy"],"dc:type":["text"],"thesis:degree_discipline":["Entomology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:35Z"}