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

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dc.contributor.author Hanson, Nova
dc.date.accessioned 2018-08-16T22:20:55Z
dc.date.copyright 2018 en_US
dc.date.issued 2018-08-16
dc.identifier.uri http://hdl.handle.net/1828/9927
dc.description.abstract Developmental 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.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Modularity en_US
dc.subject Evolvability en_US
dc.subject Metamorphosis en_US
dc.subject Biphasic life history en_US
dc.subject Mollusca en_US
dc.subject Amphissa columbiana en_US
dc.subject Crepidula fornicata en_US
dc.subject Gastropoda en_US
dc.title Developmental modularity in the feeding structures of the predatory gastropod, Amphissa columbiana (Neogastropoda; Columbellidae) en_US
dc.type Thesis en_US
dc.contributor.supervisor Page, Louise
dc.degree.department Department of Biology en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US
dc.description.embargo 2020-08-03


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