Developmental modularity in the feeding structures of the predatory gastropod, Amphissa columbiana (Neogastropoda; Columbellidae)

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dc.contributor.authorHanson, Nova
dc.contributor.supervisorPage, Louise
dc.date.accessioned2018-08-16T22:20:55Z
dc.date.copyright2018en_US
dc.date.issued2018-08-16
dc.degree.departmentDepartment of Biology
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractDevelopmental modularity may facilitate morphological evolution by allowing phenotypic change of a developing body component without negatively impacting other components. I examined foregut development in Amphissa columbiana, a predatory neogastropod with a highly derived foregut and in Crepidula fornicata, a phytoplankton-feeder with a less derived foregut, for evidence of developmental modules. Histological sections revealed that the post-metamorphic buccal cavity and radula of both species form as a ventral outpocketing (ventral module) from the larval esophagus (dorsal module). However, in Amphissa columbiana the ventral outpocketing is semi-isolated from the larval esophagus and also produces an “anterior esophagus” that is not developmentally homologous to the “anterior esophagus” of herbivorous caenogastropods. Semi-isolation of the ventral and dorsal modules of the developing neogastropod foregut allows precocious development of the post-metamorphic foregut during the larval stage without compromising larval feeding. Therefore, development of diverse variants of the post-metamorphic foregut are freed from larval constraints.en_US
dc.description.embargo2020-08-03
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/9927
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectModularityen_US
dc.subjectEvolvabilityen_US
dc.subjectMetamorphosisen_US
dc.subjectBiphasic life historyen_US
dc.subjectMolluscaen_US
dc.subjectAmphissa columbianaen_US
dc.subjectCrepidula fornicataen_US
dc.subjectGastropodaen_US
dc.titleDevelopmental modularity in the feeding structures of the predatory gastropod, Amphissa columbiana (Neogastropoda; Columbellidae)en_US
dc.typeThesisen_US

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