Direct developing predatory gastropods (Nucella spp.) retain vestiges of ancestral novelties in foregut development

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dc.contributor.authorHookham, Brenda
dc.contributor.supervisorPage, Louise Roberta
dc.date.accessioned2014-08-21T22:41:49Z
dc.date.available2014-08-21T22:41:49Z
dc.date.copyright2014en_US
dc.date.issued2014-08-21
dc.degree.departmentDepartment of Biologyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractPredatory gastropods (Neogastropoda) feed with a proboscis (elongate snout) and complex foregut. The presence of developmental modules (semi-autonomous components) in foregut development may have facilitated emergence of predatory feeding. In species with indirect development (feeding larval stage) physical and temporal separation of developing foregut modules (dorsal=larval esophagus; ventral=juvenile feeding structures) allows larval feeding and rapid switch to carnivory. However, previous studies on neogastropods with direct development (no feeding larval stage) did not identify foregut developmental modules. Thus, I investigated foregut development in two predatory, direct developing neogastropods: Nucella lamellosa and N. ostrina (Muricoidea), using histological sectioning, 3D reconstructions, TEM, and SEM. In both species, I showed evidence for dissociable dorsal and ventral foregut developmental modules. In N. lamellosa, the two modules were physically separate, although they were not separate in N. ostrina. My results reconcile differences in previous descriptions of foregut development between neogastropods with indirect and direct development.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/5585
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectCaenogastropodaen_US
dc.subjectDevelopmental Moduleen_US
dc.subjectForegut Developmenten_US
dc.subjectPredatory Feedingen_US
dc.subjectLife History Evolutionen_US
dc.titleDirect developing predatory gastropods (Nucella spp.) retain vestiges of ancestral novelties in foregut developmenten_US
dc.typeThesisen_US

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